ORCID Profile
0000-0001-8443-3396
Current Organisation
University of Adelaide
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Photonics and Electro-Optical Engineering (excl. Communications) | Photonics, Optoelectronics and Optical Communications | Electrical and Electronic Engineering | Photonics optoelectronics and optical communications | Nonlinear optics and spectroscopy | Photonic and electro-optical devices sensors and systems (excl. communications) | Electronics sensors and digital hardware | Atomic molecular and optical physics | Signal Processing | Microelectronics and Integrated Circuits | Photodetectors, Optical Sensors and Solar Cells | Nanofabrication growth and self assembly | Astronomical instrumentation | Nanomanufacturing | Communications Technologies | Nanotechnology | Atomic molecular and optical physics not elsewhere classified | Optical Fibre Communications
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Engineering | Expanding Knowledge in the Physical Sciences | Integrated Circuits and Devices | Fixed Line Data Networks and Services | Network Infrastructure Equipment |
Related Links
Publications
Nanoscale pillar hypersonic surface phononic crystals
Publisher: American Physical Society (APS)
Date: 15-09-2016
Author Correction: Ultra-efficient frequency comb generation in AlGaAs-on-insulator microresonators
Publisher: Springer Science and Business Media LLC
Date: 16-03-2021
DOI: 10.1038/S41467-021-22031-4
Abstract: A Correction to this paper has been published: 0.1038/s41467-021-22031-4
11 TOPS photonic convolutional accelerator for optical neural networks
Publisher: Springer Science and Business Media LLC
Date: 06-01-2202
Lithium niobate photonics: Unlocking the electromagnetic spectrum
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-01-2023
Abstract: Lithium niobate (LN), first synthesized 70 years ago, has been widely used in erse applications ranging from communications to quantum optics. These high-volume commercial applications have provided the economic means to establish a mature manufacturing and processing industry for high-quality LN crystals and wafers. Breakthrough science demonstrations to commercial products have been achieved owing to the ability of LN to generate and manipulate electromagnetic waves across a broad spectrum, from microwave to ultraviolet frequencies. Here, we provide a high-level Review of the history of LN as an optical material, its different photonic platforms, engineering concepts, spectral coverage, and essential applications before providing an outlook for the future of LN.
Laser-Induced Dewetting for Precise Local Generation of Au Nanostructures for Tunable Solar Absorption
Publisher: Wiley
Date: 19-05-2016
Towards on-chip photon-pair bell tests: Spatial pump filtering in a LiNbO3 adiabatic coupler
Publisher: AIP Publishing
Date: 25-12-2017
DOI: 10.1063/1.5008445
Abstract: Nonlinear optical waveguides enable the integration of entangled photon sources and quantum logic gates on a quantum photonic chip. One of the major challenges in such systems is separating the generated entangled photons from the pump laser light. In this work, we experimentally characterize double-N-shaped nonlinear optical adiabatic couplers designed for the generation of spatially entangled photon pairs through spontaneous parametric down-conversion, while simultaneously providing spatial pump filtering and keeping photon-pair states pure. We observe that the pump photons at a wavelength of 671 nm mostly remain in the central waveguide, achieving a filtering ratio of over 20 dB at the outer waveguides. We also perform classical characterization at the photon-pair wavelength of 1342 nm and observe that light fully couples from an input central waveguide to the outer waveguides, showing on chip separation of the pump and the photon-pair wavelength.
Low loss CMOS-compatible silicon nitride photonics utilizing reactive sputtered thin films
Publisher: The Optical Society
Date: 12-12-2019
DOI: 10.1364/OE.380758
Design algorithm for adiabatic photonic components using a constant coupling approach
Publisher: IEEE
Date: 06-2019
New Resonance Behavior Based on Bound States in the Continuum in a Silicon Photonic Waveguide Platform
Publisher: OSA
Date: 2019
Atomically-thin quantum dots integrated with lithium niobate photonic chips [Invited]
Publisher: The Optical Society
Date: 08-01-2019
DOI: 10.1364/OME.9.000441
Ultraviolet direct domain writing on 1280 degrees YX-cut LiNbO3: for SAW applications
Publisher: IEEE
Date: 07-2013
Self-calibrating programmable photonic integrated circuits
Publisher: Springer Science and Business Media LLC
Date: 07-07-2022
Integrated photonic high extinction short and long pass filters based on lateral leakage
Publisher: Optica Publishing Group
Date: 02-06-2021
DOI: 10.1364/OE.426442
Abstract: In this contribution we present a new approach to achieve high extinction short and long pass wavelength filters in the integrated photonic platform of lithium niobate on insulator. The filtering of unwanted wavelengths is achieved by employing lateral leakage and is related to the bound state in the continuum phenomenon. We show that it is possible to control the filter edge wavelength by adjusting the waveguide dimensions and that an extinction of hundreds of dB/cm is readily achievable. This enabled us to design a pump wavelength suppression of more than 100 dB in a 3.5 mm long waveguide, which is essential for on-chip integration of quantum-correlated photon pair sources. These findings pave the way to integrate multi wavelength experiments on chip for the next generation of photonic integrated circuits.
Picosecond pulsed squeezing in thin-film lithium niobate strip-loaded waveguides at telecommunication wavelengths
Publisher: IOP Publishing
Date: 07-2022
Abstract: Achieving a high level of pulsed squeezing, in a platform which offers integration and stability, is a key requirement for continuous-variable quantum information processing. Typically highly squeezed states are achieved with narrow band optical cavities and bulk crystals, limiting scalability. Using single-pass parametric down conversion in an integrated optical device, we demonstrate quadrature squeezing of picosecond pulses in a thin-film lithium niobate strip-loaded waveguide. For on-chip peak powers of less than 0.3 W, we measure up to −0.33 ± 0.07 dB of squeezing with an inferred on-chip value of −1.7 ± 0.4 dB. This work highlights the potential of the strip-loaded waveguide platform for broadband squeezing applications and the development of photonic quantum technologies.
Correlated twin-photon generation in a silicon nitride loaded thin film PPLN waveguide
Publisher: Optica Publishing Group
Date: 14-02-2023
DOI: 10.1364/OE.479658
Abstract: Photon-pair sources based on thin film lithium niobate on insulator technology have a great potential for integrated optical quantum information processing. We report on such a source of correlated twin-photon pairs generated by spontaneous parametric down conversion in a silicon nitride (SiN) rib loaded thin film periodically poled lithium niobate (LN) waveguide. The generated correlated photon pairs have a wavelength centred at 1560 nm compatible with present telecom infrastructure, a large bandwidth (21 THz) and a brightness of ∼2.5 × 10 5 pairs/s/mW/GHz. Using the Hanbury Brown and Twiss effect, we have also shown heralded single photon emission, achieving an autocorrelation g H ( 2 ) ( 0 ) ≃ 0.04 .
Ferroelectric-Driven Exciton and Trion Modulation in Monolayer Molybdenum and Tungsten Diselenides
Publisher: American Chemical Society (ACS)
Date: 24-04-2019
Abstract: In this work, we show how domain-engineered lithium niobate can be used to selectively dope monolayer molybdenum selenide (MoSe
Microwave and RF Photonic Fractional Hilbert Transformer Based on a 50 GHz Kerr Micro-Comb
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-12-2019
Broadband Photonic RF Channelizer With 92 Channels Based on a Soliton Crystal Microcomb
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-09-2020
Improved second harmonic performance in periodically poled LNOI waveguides through engineering of lateral leakage
Publisher: The Optical Society
Date: 06-08-2019
DOI: 10.1364/OE.27.023919
Microwave engineering filter synthesis technique for coupled ridge resonator filters
Publisher: The Optical Society
Date: 07-11-2019
DOI: 10.1364/OE.27.034370
High-speed electro-optic modulator based on silicon nitride loaded lithium niobate on an insulator platform
Publisher: Optica Publishing Group
Date: 29-11-2021
DOI: 10.1364/OL.446222
Abstract: Electro-optic (EO) modulators, which convert signals from the electrical to optical domain plays a key role in modern optical communication systems. Lithium niobate on insulator (LNOI) technology has emerged as a competitive solution to realize high-performance integrated EO modulators. In this Letter, we design and experimentally demonstrate a Mach–Zehnder interferometer-based modulator on a silicon nitride loaded LNOI platform, which not only takes full advantage of the excellent EO effect of L i N b O 3 , but also avoids the direct etching of L i N b O 3 thin film. The measured half-wave voltage length product of the fabricated modulator is 2.24 V·cm, and the extinction ratio is ∼ 20 d B . Moreover, the 3 dB EO bandwidth is ∼ 30 G H z , while the modulated data rate for on–off key signals can reach up to 80 Gbps.
Domain engineering algorithm for practical and effective photon sources
Publisher: The Optical Society
Date: 16-08-2016
DOI: 10.1364/OE.24.019616
Efficient second harmonic generation in lithium niobate on insulator waveguides and its pitfalls
Publisher: IOP Publishing
Date: 2021
Abstract: In this contribution, we investigate second harmonic generation (SHG) in periodically poled lithium niobate (LN) on insulator waveguides and examine under what conditions such waveguides suffer from undesirable loss due to lateral leakage. We investigate the lateral leakage losses in X-cut and Z-cut LN for the fundamental (1550 nm) and second harmonic (775 nm) wavelengths. Our findings show that Z-cut lithium niobate on insulator (LNOI) is more likely to suffer from lateral leakage and has a lower SHG efficiency. We further provide design guidelines for highly efficient nonlinear optical waveguides in LNOI and show how lateral leakage can be avoided.
Ultraviolet laser induced domain inversion on chromium coated lithium niobate crystals
Publisher: The Optical Society
Date: 08-01-2014
DOI: 10.1364/OME.4.000241
Minimum complexity integrated photonic architecture for delay-based reservoir computing
Publisher: Optica Publishing Group
Date: 22-03-2023
DOI: 10.1364/OE.484052
Abstract: Reservoir computing is an analog bio-inspired computation scheme for efficiently processing time-dependent signals, the photonic implementations of which promise a combination of massive parallel information processing, low power consumption, and high-speed operation. However, most of these implementations, especially for the case of time-delay reservoir computing, require extensive multi-dimensional parameter optimization to find the optimal combination of parameters for a given task. We propose a novel, largely passive integrated photonic TDRC scheme based on an asymmetric Mach-Zehnder interferometer in a self-feedback configuration, where the nonlinearity is provided by the photodetector, and with only one tunable parameter in the form of a phase shifting element that, as a result of our configuration, allows also to tune the feedback strength, consequently tuning the memory capacity in a lossless manner. Through numerical simulations, we show that the proposed scheme achieves good performance -when compared to other integrated photonic architectures- on the temporal bitwise XOR task and various time series prediction tasks, while greatly reducing hardware and operational complexity.
Integrated lithium niobate optical mode (de)interleaver based on an asymmetric Y-junction
Publisher: Optica Publishing Group
Date: 09-2023
DOI: 10.1364/OL.500232
Highly Versatile Broadband RF Photonic Fractional Hilbert Transformer Based on a Kerr Soliton Crystal Microcomb
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-12-2021
Lateral trapezoid microfluidic platform for investigating mechanotransduction of cells to spatial shear stress gradients
Publisher: Elsevier BV
Date: 11-2017
Tailor-made domain structures on the x- and y-face of lithium niobate crystals
Publisher: Springer Science and Business Media LLC
Date: 25-09-2014
High-Speed Optical Mode Switch in Lithium Niobate on Insulator
Publisher: American Chemical Society (ACS)
Date: 04-01-2023
Mitigation of electrical bandwidth limitations using optical pre-sampling
Publisher: OSA
Date: 2017
Phase retrieval of programmable photonic integrated circuits based on an on-chip fractional-delay reference path
Publisher: Optica Publishing Group
Date: 12-12-2022
Abstract: Programmable photonic integrated circuits (PICs), offering erse signal processing functions within a single chip, are promising solutions for applications ranging from optical communications to artificial intelligence. While the scale and complexity of programmable PICs are increasing, their characterization, and thus calibration, becomes increasingly challenging. Here we demonstrate a phase retrieval method for programmable PICs using an on-chip fractional-delay reference path. The impulse response of the chip can be uniquely and precisely identified from only the insertion loss using a standard complex Fourier transform. We demonstrate our approach experimentally with a four-tap finite-impulse-response chip. The results match well with expectations and verify our approach as effective for in idually determining the taps’ weights without the need for additional ports or photodiodes.
A nonlinear waveguide array with inhomogeneous poling pattern for the generation of photon pairs and its characterization in the quantum and classical regimes
Publisher: OSA
Date: 2016
Experimental demonstration of bidirectional light transfer in adiabatic waveguide structures
Publisher: The Optical Society
Date: 10-11-2016
DOI: 10.1364/OL.41.005278
Lateral Leakage in Silicon Photonics: Theory, Applications, and Future Directions
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2020
Strong frequency conversion in heterogeneously integrated GaAs resonators
Publisher: AIP Publishing
Date: 03-2019
DOI: 10.1063/1.5065533
Adaptive dispersion compensation using a photonic integrated circuit finite impulse response filter
Publisher: Optica Publishing Group
Date: 12-10-2023
DOI: 10.1364/OE.496387
RF and Microwave Fractional Differentiator Based on Photonics
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2020
Photonic RF Phase-Encoded Signal Generation With a Microcomb Source
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2020
Ultra-dense optical data transmission over standard fibre with a single chip source
Publisher: Springer Science and Business Media LLC
Date: 22-05-2020
DOI: 10.1038/S41467-020-16265-X
Abstract: Micro-combs - optical frequency combs generated by integrated micro-cavity resonators – offer the full potential of their bulk counterparts, but in an integrated footprint. They have enabled breakthroughs in many fields including spectroscopy, microwave photonics, frequency synthesis, optical ranging, quantum sources, metrology and ultrahigh capacity data transmission. Here, by using a powerful class of micro-comb called soliton crystals, we achieve ultra-high data transmission over 75 km of standard optical fibre using a single integrated chip source. We demonstrate a line rate of 44.2 Terabits s −1 using the telecommunications C-band at 1550 nm with a spectral efficiency of 10.4 bits s −1 Hz −1 . Soliton crystals exhibit robust and stable generation and operation as well as a high intrinsic efficiency that, together with an extremely low soliton micro-comb spacing of 48.9 GHz enable the use of a very high coherent data modulation format (64 QAM - quadrature litude modulated). This work demonstrates the capability of optical micro-combs to perform in demanding and practical optical communications networks.
Measurement of photon-pair generation in waveguide arrays with specialized poling
Publisher: OSA
Date: 2014
Integrated lithium niobate polarization beam splitter based on a photonic-crystal-assisted multimode interference coupler
Publisher: Optica Publishing Group
Date: 23-12-2023
DOI: 10.1364/OL.478104
Abstract: Lithium niobate on insulator (LNOI) is a promising platform for high-speed photonic integrated circuits (PICs) that are used for communication systems due to the excellent electro-optic properties of lithium niobate (LN). In such circuits, the high-speed electro-optical modulators and switches need to be integrated with passive circuit components that are used for routing the optical signals. Polarization beam splitters (PBSs) are one of the fundamental passive circuit components for high-speed PICs that can be used to (de)multiplex two orthogonal polarization optical modes, enabling on-chip polarization ision multiplexing (PDM) systems, which are suitable for enhancing the data capacity of PICs. In this Letter, we design and experimentally demonstrate a high-performance PBS constructed by a photonic crystal (PC)-assisted multimode interference (MMI) coupler. The measured polarization extinction ratio (ER) of the fabricated device is 15 dB in the wavelength range from 1525 to 1565 nm, which makes them suitable for the high-speed and large data capacity PICs required for future communication systems.
High Q resonators in the GaAs and AlGaAs on insulator platform
Publisher: OSA
Date: 2019
Mid-infrared integrated silicon–germanium ring resonator with high Q-factor
Publisher: AIP Publishing
Date: 07-2023
DOI: 10.1063/5.0149324
Abstract: We report the realization of a silicon–germanium on silicon ring resonator with high Q-factor at mid-infrared wavelengths. The fabricated ring exhibits a loaded Q-factor of 236 000 at the operating wavelength of 4.18 µm. Considering the combined waveguide propagation losses and bending losses, which are measured to be below 0.2 dB/cm, even higher Q-factors could be achieved on this platform. Furthermore, our dispersion engineering of the waveguides should make these microrings suitable for nonlinear optical applications. These results pave the way for sensing applications and nonlinear optics in the mid-infrared range.
Integrated photonics on the dielectrically loaded lithium niobate on insulator platform
Publisher: Optica Publishing Group
Date: 10-03-2023
DOI: 10.1364/JOSAB.482507
Abstract: Thin-film lithium niobate on insulator (LNOI) is emerging as one of the promising platforms for integrated photonics due to the excellent material properties of lithium niobate, which includes a strong electro-optic effect, high second-order optical nonlinearity, a large optical transparency window, and low material loss. Although direct etching of lithium niobate has been adopted more widely in recent years, it remains to be seen if it will be adopted in foundry processes due to the incompatibility with standard CMOS fabrication processes. Thus, the scalability of the LNOI platform is currently still limited when compared with other platforms such as silicon photonics. Dielectrically loaded LNOI waveguides may present an alternative. These waveguides have been used to demonstrate a range of optical components with a simplified fabrication process while demonstrating competitive performance. In this contribution, we review the recent progress in dielectrically loaded LNOI waveguides, summarize the advantages and disadvantages of different loading materials, compare the performance of different platforms, and discuss the future of these platforms for photonic integrated circuits.
Quantum tomography of a nonlinear photonic circuit by classical sum-frequency generation measurements
Publisher: IEEE
Date: 07-2017
High bandwidth frequency modulation of an external cavity diode laser using an intracavity lithium niobate electro-optic modulator as output coupler
Publisher: AIP Publishing
Date: 08-2022
DOI: 10.1063/5.0097880
Abstract: We present a novel approach to high bandwidth laser frequency modulation. A lithium niobate chip is used as an intracavity electro-optic modulator in a tunable cateye external cavity diode laser. The modulator is conveniently integrated with the cateye output coupler, providing a unique approach to high bandwidth frequency stabilization and linewidth narrowing. The intracavity modulator feedback was successfully operated below 1 V and achieved superior frequency noise suppression compared to conventional feedback through diode injection current modulation. A closed loop bandwidth of 1.8 MHz was demonstrated, and the laser linewidth reduced to around 1 Hz as measured by the heterodyne measurement.
Sub-micron domain engineering in lithium niobate by laser light irradiation of patterned chromium
Publisher: IEEE
Date: 05-2015
Second Order Nonlinear Photonic Integrated Platforms for Optical Signal Processing
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2021
High Efficiency SHG in Heterogenous Integrated GaAs Ring Resonators
Publisher: IEEE
Date: 09-2018
Integral order photonic RF signal processors based on a soliton crystal micro-comb source
Publisher: IOP Publishing
Date: 27-10-2021
Abstract: Soliton crystal micro-combs are powerful tools as sources of multiple wavelength channels for radio frequency (RF) signal processing. They offer a compact device footprint, a large number of wavelengths, very high versatility, and wide Nyquist bandwidths. Here, we demonstrate integral order RF signal processing functions based on a soliton crystal micro-comb, including a Hilbert transformer and first, second and third-order differentiators. We compare and contrast the results and the trade-offs involved with varying the comb spacing, and tap design and shaping methods.
Direct writing of ferroelectric domains on strontium barium niobate crystals using focused ultraviolet laser light
Publisher: AIP Publishing
Date: 30-09-2013
DOI: 10.1063/1.4823702
Abstract: We report ferroelectric domain inversion in strontium barium niobate (SBN) single crystals by irradiating the surface locally with a strongly focused ultraviolet (UV) laser beam. The generated domains are investigated using piezoresponse force microscopy. We propose a simple model that allows predicting the domain width as a function of the irradiation intensity, which indeed applies for both SBN and LiNbO3. Evidently, though fundamentally different, the domain structure of both SBN and LiNbO3 can be engineered through similar UV irradiation.
Low loss (Al)GaAs on an insulator waveguide platform
Publisher: The Optical Society
Date: 14-08-2019
DOI: 10.1364/OL.44.004075
Ridge waveguide couplers with leaky mode resonator-like wavelength responses
Publisher: Optica Publishing Group
Date: 23-12-2023
DOI: 10.1364/OE.473131
Abstract: Integrated photonic resonators based on bound states in the continuum (BICs) on the silicon-on-insulator (SOI) platform have the potential for novel, mass-manufacturable resonant devices. While the nature of BIC-based ridge resonators requires the resonators to be extended in the (axial) propagation direction of the resonant mode, the requirement for excitation from the quasi-continuum extends the resonator structures also in the lateral dimensions, resulting in large device footprints. To overcome this footprint requirement, we investigate the translation of BIC-based ridge resonators into a guided mode system with finite lateral dimensions. We draw analogies between the resulting waveguide system and the BIC-based resonators and numerically demonstrate that, analog to the BIC-based resonators, such a waveguide system can exhibit spectrally narrow-band inversion of its transmissive behavior.
Tailor-made domain structures on the x-face and y-face of LiNbO<inf>3</inf> crystals
Publisher: IEEE
Date: 07-2012
Polariton-based band gap and generation of surface acoustic waves in acoustic superlattice lithium niobate
Publisher: AIP Publishing
Date: 05-08-2013
DOI: 10.1063/1.4817271
Abstract: We report the presence of surface acoustic wave (SAW) band gap on acoustic superlattice (ASL) in a single-crystal lithium niobate structure. The band gap behavior is determined by calculating the SAW band structure and also by simulating the transmission of an acoustic wave through a finite length section of ASL using finite element analysis. The calculated band gap appears at a frequency twice the value expected from purely acoustic Bragg scattering. We have identified the band gap as originating from a polariton-based mechanism due to the coupling between the electromagnetic wave and the surface vibrations. We have examined the influence of the band gap on SAW generation with the ASL and have shown that the calculated frequency resonance of the SAW lies in the vicinity of the upper stop-band edges. This results in the localization of the SAW in the ASL. Experimental confirmation is achieved through direct measurement of the SAW displacement by laser vibrometry on an actual ASL SAW transducer. The localization of generated SAW to the ASL transducer is observed confirming the prediction of the existence of a band gap.
Ultraviolet laser-induced poling inhibition produces bulk domains in MgO-doped lithium niobate crystals
Publisher: AIP Publishing
Date: 09-2014
DOI: 10.1063/1.4895387
Abstract: We report the realization of high-resolution bulk domains achieved using a shallow, structured, domain inverted surface template obtained by UV laser-induced poling inhibition in MgO-doped lithium niobate. The quality of the obtained bulk domains is compared to those of the template and their application for second harmonic generation is demonstrated. The present method enables domain structures with a period length as small as 3 μm to be achieved. Furthermore, we propose a potential physical mechanism that leads to the transformation of the surface template into bulk domains.
UV Direct Write Metal Enhanced Redox (MER) Domain Engineering for Realization of Surface Acoustic Devices on Lithium Niobate
Publisher: Wiley
Date: 15-04-2014
Ridge Resonance in Silicon Photonics Harnessing Bound States in the Continuum
Publisher: Wiley
Date: 10-09-2019
Phonon‐polariton entrapment in homogenous surface phonon cavities
Publisher: Wiley
Date: 05-02-2016
A gallium arsenide nonlinear platform on silicon
Publisher: OSA
Date: 2018
Quasi-phase matching via femtosecond laser-induced domain inversion in lithium niobate waveguides
Publisher: The Optical Society
Date: 16-05-2016
DOI: 10.1364/OL.41.002410
Tailor-made domain structures on the x-face and y-face of LiNbO3 crystals
Publisher: IEEE
Date: 12-2012
Ridge resonators: impact of excitation beam and resonator losses
Publisher: Optica Publishing Group
Date: 05-08-2021
DOI: 10.1364/OE.434574
Abstract: Photonic resonators based on bound states in the continuum are attractive for sensing and telecommunication applications, as they have the potential to achieve ultra-high Q-factor resonators in a compact footprint. Recently, ridge resonators – leaky mode resonators based on a bound state in the continuum – have been demonstrated on a scalable photonic integrated circuit platform. However, high Q-factor ridge resonators have thus far not been achieved. In this contribution, we investigate the influence of excitation beam width and optical losses on the spectral response of ridge resonators. We show that for practical applications, the space required of the excitation beam is the limiting factor on the highest achievable Q-factor.
Optical frequency comb based system for photonic refractive index sensor interrogation
Publisher: The Optical Society
Date: 16-07-2019
DOI: 10.1364/OE.27.021532
Impact of domain depth on SAW generation by acoustic superlattice transducer in 128° YX-cut lithium niobate
Publisher: IEEE
Date: 07-2013
Precise, reproducible nano-domain engineering in lithium niobate crystals
Publisher: AIP Publishing
Date: 13-07-2015
DOI: 10.1063/1.4926910
Abstract: We present a technique for domain engineering the surface of lithium niobate crystals with features as small as 100 nm. A film of chromium (Cr) is deposited on the lithium niobate surface and patterned using electron beam lithography and lift-off and then irradiated with a wide diameter beam of intense visible laser light. The regions patterned with chromium are domain inverted while the uncoated regions are not affected by the irradiation. With the ability to realize nanoscale surface domains, this technique could offer an avenue for fabrication of nano-photonic and phononic devices.
Frequency conversion between UV and telecom wavelengths in a lithium niobate waveguide for quantum communication with Yb+trapped ions
Publisher: IOP Publishing
Date: 22-09-2016
Direct characterization of a nonlinear photonic circuit's wave function with laser light
Publisher: Springer Science and Business Media LLC
Date: 12-01-2018
DOI: 10.1038/LSA.2017.143
Abstract: Integrated photonics is a leading platform for quantum technologies including nonclassical state generation 1, 2, 3, 4 , demonstration of quantum computational complexity 5 and secure quantum communications 6 . As photonic circuits grow in complexity, full quantum tomography becomes impractical, and therefore an efficient method for their characterization 7, 8 is essential. Here we propose and demonstrate a fast, reliable method for reconstructing the two-photon state produced by an arbitrary quadratically nonlinear optical circuit. By establishing a rigorous correspondence between the generated quantum state and classical sum-frequency generation measurements from laser light, we overcome the limitations of previous approaches for lossy multi-mode devices 9, 10 . We applied this protocol to a multi-channel nonlinear waveguide network and measured a 99.28±0.31% fidelity between classical and quantum characterization. This technique enables fast and precise evaluation of nonlinear quantum photonic networks, a crucial step towards complex, large-scale, device production.
Photonic RF Arbitrary Waveform Generator Based on a Soliton Crystal Micro-Comb Source
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-11-2020
Non-resonant recirculating light phase modulator
Publisher: AIP Publishing
Date: 10-2022
DOI: 10.1063/5.0103558
Abstract: High efficiency and a compact footprint are desired properties for electro-optic modulators. In this paper, we propose, theoretically investigate, and experimentally demonstrate a recirculating phase modulator, which increases the modulation efficiency by modulating the optical field several times in a non-resonant waveguide structure. The “recycling” of light is achieved by looping the optical path that exits the phase modulator back and coupling it to a higher order waveguide mode, which then repeats its passage through the phase modulator. By looping the light back twice, we were able to demonstrate a recirculating phase modulator that requires nine times lower power to generate the same modulation index of a single pass phase modulator. This approach to modulation efficiency enhancement is promising for the design of advanced tunable electro-optical frequency comb generators and other electro-optical devices with defined operational frequency bandwidths.
Low stress, anomalous dispersive silicon nitride waveguides fabricated by reactive sputtering
Publisher: IEEE
Date: 06-2019
Photonic RF and Microwave Integrator Based on a Transversal Filter With Soliton Crystal Microcombs
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2020
Arbitrary access to optical carriers in silicon photonic mode/wavelength hybrid division multiplexing circuits
Publisher: Optica Publishing Group
Date: 11-07-2022
DOI: 10.1364/OL.463445
Abstract: The manipulation of optical modes directly in a multimode waveguide without affecting the transmission of undesired signal carriers is of significance to realize a flexible and simple structured optical network-on-chip. In this Letter, an arbitrary optical mode and wavelength carrier access scheme is proposed based on a series of multimode microring resonators and one multimode bus waveguide with constant width. As a proof-of-concept, a three-mode (de)multiplexing device is designed, fabricated, and experimentally demonstrated. A new, to the best of our knowledge, phase-matching idea is employed to keep the bus waveguide width constant. The mode coupling regions and transmission regions of the microring resonators are designed carefully to selectively couple and transmit different optical modes. The extinction ratio of the microring resonators is larger than 21.0 dB. The mode and wavelength cross-talk for directly (de)multiplexing are less than −12.8 dB and −19.0 dB, respectively. It would be a good candidate for future large-scale multidimensional optical networks.
Ultra-efficient frequency comb generation in AlGaAs-on-insulator microresonators
Publisher: Springer Science and Business Media LLC
Date: 12-03-2020
DOI: 10.1038/S41467-020-15005-5
Abstract: Recent advances in nonlinear optics have revolutionized integrated photonics, providing on-chip solutions to a wide range of new applications. Currently, state of the art integrated nonlinear photonic devices are mainly based on dielectric material platforms, such as Si 3 N 4 and SiO 2 . While semiconductor materials feature much higher nonlinear coefficients and convenience in active integration, they have suffered from high waveguide losses that prevent the realization of efficient nonlinear processes on-chip. Here, we challenge this status quo and demonstrate a low loss AlGaAs-on-insulator platform with anomalous dispersion and quality ( Q ) factors beyond 1.5 × 10 6 . Such a high quality factor, combined with high nonlinear coefficient and small mode volume, enabled us to demonstrate a Kerr frequency comb threshold of only ∼36 µW in a resonator with a 1 THz free spectral range, ∼100 times lower compared to that in previous semiconductor platforms. Moreover, combs with broad spans ( nm) have been generated with a pump power of ∼300 µW, which is lower than the threshold power of state-of the-art dielectric micro combs. A soliton-step transition has also been observed for the first time in an AlGaAs resonator.
Monolithic Phononic Crystals with a Surface Acoustic Band Gap from Surface Phonon-Polariton Coupling
Publisher: American Physical Society (APS)
Date: 21-11-2014
Hybrid and heterogeneous photonic integration
Publisher: AIP Publishing
Date: 06-2021
DOI: 10.1063/5.0052700
Abstract: Increasing demand for every faster information throughput is driving the emergence of integrated photonic technology. The traditional silicon platform used for integrated electronics cannot provide all of the functionality required for fully integrated photonic circuits, and thus, the last decade has seen a strong increase in research and development of hybrid and heterogeneous photonic integrated circuits. These approaches have enabled record breaking experimental demonstrations, harnessing the most favorable properties of multiple material platforms, while the robustness and reliability of these technologies are suggesting entirely new approaches for precise mass manufacture of integrated circuits with unprecedented variety and flexibility. This Tutorial provides an overview of the motivation behind the integration of different photonic and material platforms. It reviews common hybrid and heterogeneous integration methods and discusses the advantages and shortcomings. This Tutorial also provides an overview of common photonic elements that are integrated in photonic circuits. Finally, an outlook is provided about the future directions of the hybrid/heterogeneous photonic integrated circuits and their applications.
Ridge resonators with compact guided mode coupling
Publisher: Optica Publishing Group
Date: 27-09-2023
DOI: 10.1364/OE.498428
Status and Potential of Lithium Niobate on Insulator (LNOI) for Photonic Integrated Circuits
Publisher: Wiley
Date: 23-02-2018
Optical frequency comb generation with low temperature reactive sputtered silicon nitride waveguides
Publisher: AIP Publishing
Date: 2020
DOI: 10.1063/1.5136270
Abstract: Integrated silicon nitride (SiN) waveguides with anomalous dispersion have the potential to bring practical nonlinear optics to mainstream photonic integrated circuits. However, high-stress and high-processing temperatures remain an obstacle to mass adoption. We report low-stress, high-confinement, dispersion-engineered SiN waveguides utilizing low temperature grown reactive sputtered thin-films. We demonstrate a microring resonator with an intrinsic quality factor of 6.6 × 105, which enabled us to generate a native free spectral range spaced frequency comb with an estimated on-chip pump power of 850 mW. Importantly, the peak processing temperature is 400 °C making this approach fully back-end compatible for hybrid integration with preprocessed CMOS substrates and temperature sensitive photonic platforms such as lithium niobate on insulator.
Heterogeneously Integrated GaAs Waveguides on Insulator for Efficient Frequency Conversion
Publisher: Wiley
Date: 14-08-2018
Ferroelectric domain engineering using infrared femtosecond laser and its application to optical frequency conversion
Publisher: OSA
Date: 2016
Single-step etched grating couplers for silicon nitride loaded lithium niobate on insulator platform
Publisher: AIP Publishing
Date: 08-2021
DOI: 10.1063/5.0055213
Integrated subwavelength gratings on a lithium niobate on insulator platform for mode and polarization manipulation
Publisher: Research Square Platform LLC
Date: 31-01-2029
DOI: 10.21203/RS.3.RS-1310958/V1
Abstract: Lithium niobate on insulator (LNOI) has emerged as a promising platform for photonic integrated circuits, with a fast-growing toolbox of components. In this paper, we propose, design and experimentally demonstrate compact subwavelength grating (SWG) waveguides on a LNOI platform for on-chip mode and polarization manipulation. To overcome the limitation of waveguide fabrication, the SWGs are designed and formed on a silicon nitride thin film deposited onto the surface of LNOI chip. As proof-of-concept devices, the SWG-based spatial mode filters and a TM-pass polarizer are fabricated successfully on the same chip, with the device lengths of only ~50 μm. The measured insertion losses for the devices are lower than 3.1 dB, with high extinction ratio larger than 30 dB, at a wavelength of 1550 nm. The proposed and demonstrated SWGs can serve as important building blocks in a series of mode and polarization handling devices for LNOI integrated photonics.
Monolithic photonic integrated circuit based on silicon nitride and lithium niobate on insulator hybrid platform
Publisher: Research Square Platform LLC
Date: 06-04-2022
DOI: 10.21203/RS.3.RS-1486220/V1
Abstract: Lithium niobate on insulator (LNOI) has been demonstrated as a promising platform for photonic integrated circuits (PICs), thanks to its excellent properties such as strong electro-optic effect, low material loss and wide transparency window. In this paper, we propose and demonstrate a monolithic PIC for high-speed data communication application on a lithium-niobate-etchless platform with silicon nitride (Si3N4) as a loading material. The fabricated PIC consists of four racetrack resonator modulators and a pair of four-channel mode (de)multiplexers, which shows high data modulation rate of 70 Gbps for single channel and the total data throughput reaches up to 280 Gbps. To the best of our knowledge, this is the first demonstration of PIC consisting of high-speed electro-optical modulators and (de)multiplexers with such high data capacity on Si3N4-LNOI hybrid platform, which opens up new avenues for achieving large-scale monolithic integration on LNOI platform in future.
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