ORCID Profile
0000-0002-3408-886X
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Atomic molecular and optical physics | Nanofabrication growth and self assembly | Astronomical instrumentation | Photonics optoelectronics and optical communications | Nonlinear optics and spectroscopy
Publisher: The Optical Society
Date: 25-06-2019
DOI: 10.1364/OE.27.019309
Publisher: Springer Science and Business Media LLC
Date: 10-2006
DOI: 10.1038/NATURE05147
Abstract: Over the past decade, strong interactions of light and matter at the single-photon level have enabled a wide set of scientific advances in quantum optics and quantum information science. This work has been performed principally within the setting of cavity quantum electrodynamics with erse physical systems, including single atoms in Fabry-Perot resonators, quantum dots coupled to micropillars and photonic bandgap cavities and Cooper pairs interacting with superconducting resonators. Experiments with single, localized atoms have been at the forefront of these advances with the use of optical resonators in high-finesse Fabry-Perot configurations. As a result of the extreme technical challenges involved in further improving the multilayer dielectric mirror coatings of these resonators and in scaling to large numbers of devices, there has been increased interest in the development of alternative microcavity systems. Here we show strong coupling between in idual caesium atoms and the fields of a high-quality toroidal microresonator. From observations of transit events for single atoms falling through the resonator's evanescent field, we determine the coherent coupling rate for interactions near the surface of the resonator. We develop a theoretical model to quantify our observations, demonstrating that strong coupling is achieved, with the rate of coherent coupling exceeding the dissipative rates of the atom and the cavity. Our work opens the way for investigations of optical processes with single atoms and photons in lithographically fabricated microresonators. Applications include the implementation of quantum networks, scalable quantum logic with photons, and quantum information processing on atom chips.
Publisher: American Chemical Society (ACS)
Date: 25-10-2014
DOI: 10.1021/PH500262B
Publisher: American Physical Society (APS)
Date: 16-09-2004
Publisher: American Physical Society (APS)
Date: 16-11-2006
Publisher: American Association for the Advancement of Science (AAAS)
Date: 17-06-2022
Abstract: Erbium-doped fiber lifiers revolutionized long-haul optical communications and laser technology. Erbium ions could provide a basis for efficient optical lification in photonic integrated circuits but their use remains impractical as a result of insufficient output power. We demonstrate a photonic integrated circuit–based erbium lifier reaching 145 milliwatts of output power and more than 30 decibels of small-signal gain—on par with commercial fiber lifiers and surpassing state-of-the-art III-V heterogeneously integrated semiconductor lifiers. We apply ion implantation to ultralow–loss silicon nitride (Si 3 N 4 ) photonic integrated circuits, which are able to increase the soliton microcomb output power by 100 times, achieving power requirements for low-noise photonic microwave generation and wavelength- ision multiplexing optical communications. Endowing Si 3 N 4 photonic integrated circuits with gain enables the miniaturization of various fiber-based devices such as high–pulse-energy femtosecond mode-locked lasers.
Publisher: AIP Publishing
Date: 15-04-2006
DOI: 10.1063/1.2188050
Abstract: Erbium-doped SiO2 toroidal microcavity lasers are fabricated on a Si substrate using a combination of optical lithography, etching, Er ion implantation, and CO2 laser reflow. Erbium is either preimplanted in the SiO2 base material or postimplanted into a fully fabricated microtoroid. Three-dimensional infrared confocal photoluminescence spectroscopy imaging is used to determine the spatial distribution of optically active Er ions in the two types of microtoroids, and distinct differences are found. Microprobe Rutherford backscattering spectrometry indicates that no macroscopic Er diffusion occurs during the laser reflow for preimplanted microtoroids. From the measured Er doping profiles and calculated optical mode distributions the overlap factor between the Er distribution and mode profile is calculated: Γ=0.066 and Γ=0.02 for postimplanted and preimplanted microtoroids, respectively. Single and multimode lasing around 1.5μm is observed for both types of microtoroids, with the lowest lasing threshold (4.5μW) observed for the preimplanted microtoroids, which possess the smallest mode volume. When excited in the proper geometry, a clear mode spectrum is observed superimposed on the Er spontaneous emission spectrum. This result indicates the coupling of Er ions to cavity modes.
Publisher: American Physical Society (APS)
Date: 10-07-2009
Publisher: American Physical Society (APS)
Date: 03-05-2023
Publisher: American Chemical Society (ACS)
Date: 07-05-2015
DOI: 10.1021/ACS.NANOLETT.5B00858
Abstract: Nanomechanical resonators are highly suitable as sensors of minute forces, displacements, or masses. We realize a single plasmonic dimer antenna of subwavelength size, integrated with silicon nitride nanobeams. The sensitive dependence of the antenna response on the beam displacement creates a plasmomechanical system of deeply subwavelength size in all dimensions. We use it to demonstrate transduction of thermal vibrations to scattered light fields and discuss the noise properties and achievable coupling strengths in these systems.
Publisher: SPIE
Date: 13-09-2007
DOI: 10.1117/12.734875
Publisher: Elsevier BV
Date: 2006
Publisher: American Chemical Society (ACS)
Date: 11-06-2013
DOI: 10.1021/NL4015028
Abstract: We demonstrate plasmon-mechanical coupling in a metalized nanomechanical oscillator. A coupled surface plasmon is excited in the 25 nm wide gap between two metalized silicon nitride beams. The strong plasmonic dispersion allows the nanomechanical beams' thermal motion at a frequency of 4.4 MHz to be efficiently transduced to the optical transmission, with a measured displacement spectral density of 1.11 × 10(-13) m/Hz(1/2). When exciting the second-order plasmonic mode at λ = 780 nm we observe optical-power-induced frequency shifts of the mechanical oscillator. Our results show that novel functionality of plasmonic nanostructures can be achieved through coupling to engineered nanoscale mechanical oscillators.
Publisher: AIP Publishing
Date: 10-02-2004
DOI: 10.1063/1.1646748
Abstract: We present an erbium-doped microlaser on silicon operating at a wavelength of 1.5 μm that operates at a launched pump threshold as low as 4.5 μW. The 40 μm diameter toroidal microresonator is made using a combination of erbium ion implantation, photolithography, wet and dry etching, and laser annealing, using a thermally grown SiO2 film on a Si substrate as a starting material. The microlaser, doped with an average Er concentration of 2×1019 cm−3, is pumped at 1480 nm using an evanescently coupled tapered optical fiber. Cavity quality factors as high as 3.9×107 are achieved, corresponding to a modal loss of 0.007 dB/cm, and single-mode lasing is observed.
Publisher: Springer Science and Business Media LLC
Date: 04-2022
DOI: 10.1038/S41467-022-29431-0
Abstract: The past decade has witnessed major advances in the development and system-level applications of photonic integrated microcombs, that are coherent, broadband optical frequency combs with repetition rates in the millimeter-wave to terahertz domain. Most of these advances are based on harnessing of dissipative Kerr solitons (DKS) in microresonators with anomalous group velocity dispersion (GVD). However, microcombs can also be generated with normal GVD using localized structures that are referred to as dark pulses, switching waves or platicons. Compared with DKS microcombs that require specific designs and fabrication techniques for dispersion engineering, platicon microcombs can be readily built using CMOS-compatible platforms such as thin-film (i.e., thickness below 300 nm) silicon nitride with normal GVD. Here, we use laser self-injection locking to demonstrate a fully integrated platicon microcomb operating at a microwave K-band repetition rate. A distributed feedback (DFB) laser edge-coupled to a Si 3 N 4 chip is self-injection-locked to a high- Q ( 10 7 ) microresonator with high confinement waveguides, and directly excites platicons without sophisticated active control. We demonstrate multi-platicon states and switching, perform optical feedback phase study and characterize the phase noise of the K-band platicon repetition rate and the pump laser. Laser self-injection-locked platicons could facilitate the wide adoption of microcombs as a building block in photonic integrated circuits via commercial foundry service.
Location: Switzerland
Location: United States of America
Start Date: 2023
End Date: 12-2029
Amount: $34,948,820.00
Funder: Australian Research Council
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