ORCID Profile
0000-0002-6803-0666
Current Organisation
University of South Australia
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Optical Physics | Nanobiotechnology | Optical Physics not elsewhere classified |
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in the Biological Sciences | Expanding Knowledge in Technology
Publisher: SPIE
Date: 09-12-2016
DOI: 10.1117/12.2242705
Publisher: American Chemical Society (ACS)
Date: 04-10-2021
Publisher: AIP Publishing
Date: 02-2021
DOI: 10.1063/5.0036300
Abstract: The tracking of small particles is an important but challenging task for biological applications such as disease diagnostics and medical research. Current methods are limited to the use of bulky instruments such as flow cytometers and microscopes. Here, a novel technique for the detection and measurement of micron-scale optical scatterers using a few-mode exposed-core microstructured optical fiber is proposed. Through selective mode launching combined with optical frequency domain reflectometry, scatterers located on the fiber core surface can be simultaneously mapped with both longitudinal and transverse information. This technique is demonstrated by detecting the two-dimensional positions of several femtosecond-laser-inscribed micron-scale ablations written at different locations on the fiber core surface. Due to the compact nature of the optical fiber and its local sensitivity to scatterers that are in close proximity to it, this technique has the potential for the measurement and detection of micron-scale particles in difficult to reach biological environments for in vivo applications.
Publisher: SPIE
Date: 16-02-2018
DOI: 10.1117/12.2288863
Publisher: The Optical Society
Date: 09-03-2017
DOI: 10.1364/OE.25.006192
Publisher: The Optical Society
Date: 14-03-2016
DOI: 10.1364/OL.41.001257
Publisher: SPIE
Date: 24-11-2016
DOI: 10.1117/12.2242707
Publisher: The Optical Society
Date: 27-10-2015
DOI: 10.1364/OE.23.028896
Publisher: SPIE
Date: 03-03-2015
DOI: 10.1117/12.2078526
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NR02931F
Abstract: High resolution greyscale fluorescence images created in thin phosphor films using UV light.
Publisher: The Optical Society
Date: 05-12-2016
Publisher: American Geophysical Union (AGU)
Date: 05-09-2013
DOI: 10.1002/GRL.50872
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2012
Publisher: IEEE
Date: 07-2020
Publisher: OSA
Date: 2016
Publisher: Elsevier BV
Date: 06-2009
Publisher: Optica Publishing Group
Date: 26-04-2018
DOI: 10.1364/OE.26.012266
Publisher: IEEE
Date: 09-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR05108E
Abstract: A novel method to monitor X-ray dose by employing upconversion luminescence in nanocrystalline SrFCl:Yb 3+ /Er 3+ is reported.
Publisher: AIP Publishing
Date: 19-01-2015
DOI: 10.1063/1.4905931
Abstract: Whispering gallery mode lasers are of interest for a wide range of applications and especially biological sensing, exploiting the dependence of the resonance wavelengths on the surrounding refractive index. Upon lasing, the Q factors of the resonances are greatly improved, enabling measurements of wavelength shifts with increased accuracy. A way forward to improve the performance of the refractive index sensing mechanism is to reduce the size of the optical resonator, as the refractive index sensitivity is inversely proportional to the resonator dimensions. However, as the lasing threshold is believed to depend on the Q factor among other parameters, and the reduction of the microresonator size results in lower Q, this poses additional challenges for reaching the lasing threshold. In this letter, we demonstrate lasing in 10 μm diameter dye doped polystyrene microspheres in aqueous solution, the smallest polystyrene microsphere lasers ever reported in these conditions. We also investigate the dependence of the lasing threshold on the Q factor by changing the refractive index surrounding the sphere, highlighting a much stronger dependency than initially reported.
Publisher: American Chemical Society (ACS)
Date: 23-09-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2013
Publisher: IEEE
Date: 06-2019
Publisher: Optica Publishing Group
Date: 09-2021
DOI: 10.1364/OE.433541
Abstract: Graded-index optical fiber probes suitable for focusing or collimating the output of an optical fiber at a wavelength of 1.3 µm have become an enabling technology in optical coherence tomography imaging applications for in vivo bioimaging. Such fiber tips however remain uncommon in other photonics applications. This paper provides the first numerical study of graded-index fiber tips covering a broad range of wavelengths spanning from the UV to short-infrared. The wavelength dependency and the influence of probe geometry on performance characteristics such as far-field ergence angle, spot size and working distance are analyzed. The paper yields easily accessible design guidelines for the fabrication of collimating or focusing fiber tips. Fiber collimators have considerable potential for use in free-space systems and could benefit a range of devices such as variable attenuators, dynamic wavelength equalisers and large 3D optical cross-connect switches, whereas focusing fiber tips have applications in high-resolution imaging.
Publisher: MDPI AG
Date: 07-09-2018
DOI: 10.3390/S18092987
Abstract: Whispering gallery mode (WGM) resonators have become increasingly erse in terms of both architecture and applications, especially as refractometric sensors, allowing for unprecedented levels of sensitivity. However, like every refractometric sensor, a single WGM resonator cannot distinguish temperature variations from changes in the refractive index of the surrounding environment. Here, we investigate how breaking the symmetry of an otherwise perfect fluorescent microsphere, by covering half of the resonator with a high-refractive-index (RI) glue, might enable discrimination of changes in temperature from variations in the surrounding refractive index. This novel approach takes advantage of the difference of optical pathway experienced by WGMs circulating in different equatorial planes of a single microsphere resonator, which induces mode-splitting. We investigated the influence of the surrounding RI of the microsphere on mode-splitting through an evaluation of the sphere’s WGM spectrum and quality factor (Q-factor). Our results reveal that the magnitude of the mode-splitting increases as the refractive index contrast between the high-refractive-index (RI) glue and the surrounding environment increases, and that when they are equal no mode-splitting can be seen. Investigating the refractive index sensitivity of the in idual sub modes resulting from the mode-splitting unveils a new methodology for RI sensing, and enables discrimination between surrounding refractive index changes and temperature changes, although it comes at the cost of an overall reduced refractive index sensitivity.
Publisher: IOP Publishing
Date: 12-03-2021
Abstract: An analysis is provided of fiber-optic Fabry–Perot interferometers designed and fabricated using collimating graded-index fiber (GIF) tips as an alternative to typical highly ergent standard single-mode fibers (SMFs). The collimated beam from the GIF tips allows for significantly longer etalons to be fabricated due to the increased collection efficiency when used either in reflection or transmission mode. We extend previous results, showing that GIF tips using coreless fiber segments can allow for up to four-fold increase in fringe visibility (FV) at 1550 nm compared with standard SMF Fabry–Perot etalons of the same length. The collimating GIF tips help lessen the FV vs cavity length trade-off typically observed in fiber-optic Fabry–Perot systems. We also explore the effects on FV improvement when using capillaries to align the fibres. This paper also provides easily accessible design guidelines and considerations for fabricating GIF based devices at 1550 nm.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1DT03024H
Abstract: We report photoluminescence and photoionization properties of Sm
Publisher: American Chemical Society (ACS)
Date: 08-03-2016
DOI: 10.1021/ACS.ANALCHEM.6B00365
Abstract: Biosensing within complex biological s les requires a sensor that can compensate for fluctuations in the signal due to changing environmental conditions and nonspecific binding events. To achieve this, we developed a novel self-referenced biosensor consisting of two almost identically sized dye-doped polystyrene microspheres placed on adjacent holes at the tip of a microstructured optical fiber (MOF). Here self-referenced biosensing is demonstrated with the detection of Neutravidin in undiluted, immunoglobulin-deprived human serum s les. The MOF allows remote excitation and collection of the whispering gallery modes (WGMs) of the microspheres while also providing a robust and easy to manipulate dip-sensing platform. By taking advantage of surface functionalization techniques, one microsphere acts as a dynamic reference, compensating for nonspecific binding events and changes in the environment (such as refractive index and temperature), while the other microsphere is functionalized to detect a specific interaction. The almost identical size allows the two spheres to have virtually identical refractive index sensitivity and surface area, while still having discernible WGM spectra. This ensures their responses to nonspecific binding and environmental changes are almost identical, whereby any specific changes, such as binding events, can be monitored via the relative movement between the two sets of WGM peaks.
Publisher: The Optical Society
Date: 20-11-2014
DOI: 10.1364/OE.22.029855
Publisher: Optica Publishing Group
Date: 2020
Abstract: The increase in Internet data demand has resulted in the development of novel optical fibers. Ultrafast laser inscription is a powerful tool to create 3D waveguide circuits that can interface with these new fiber types.
Publisher: OSA
Date: 2015
Publisher: Optica Publishing Group
Date: 08-12-2021
DOI: 10.1364/BOE.414239
Abstract: This paper describes the design and characterization of miniaturized optofluidic devices for sensing based on integrating collimating optical fibers with custom microfluidic chips. The use of collimating graded-index fiber (GIF) tips allows for effective fiber-channel-fiber interfaces to be realized when compared with using highly- ergent standard single-mode fiber (SMF). The reduction in both beam ergence and insertion losses for the GIF configuration compared with SMF was characterized for a 10.0 mm channel. Absorption spectroscopy was demonstrated on chip for the measurement of red color dye (Ponceau 4R), and the detection of thiocyanate in water and artificial human saliva. The proposed optofluidic setup allows for absorption spectroscopy measurements to be performed with only 200 µL of solution which is an order of magnitude smaller than for standard cuvettes but provides a comparable sensitivity. The approach could be integrated into a lab-on-a-chip system that is compact and does not require free-space optics to perform absorption spectroscopy.
Publisher: Wiley
Date: 15-07-2014
Publisher: The Optical Society
Date: 28-05-2015
DOI: 10.1364/OE.23.014784
Publisher: The Optical Society
Date: 11-05-0003
DOI: 10.1364/AO.51.002778
Publisher: The Optical Society
Date: 31-05-2016
DOI: 10.1364/OE.24.012466
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1CP05737E
Abstract: The generation of Mn 4+ in α-Al 2 O 3 :Mn 3+ by soft X-ray exposure is demonstrated with a large dynamic range of the X-ray generated Mn 4+ luminescence signal, indicating the potential use of α-Al 2 O 3 :Mn 3+ for multilevel optical data storage.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-03-2018
Publisher: The Optical Society
Date: 20-09-2012
DOI: 10.1364/OL.37.003990
Publisher: OSA
Date: 2016
Publisher: American Chemical Society (ACS)
Date: 17-06-2021
Publisher: IEEE
Date: 09-2018
Publisher: SPIE
Date: 03-03-2015
DOI: 10.1117/12.2076889
Publisher: The Oceanography Society
Date: 06-2012
Publisher: American Physical Society (APS)
Date: 12-11-2018
Publisher: Optica Publishing Group
Date: 2021
DOI: 10.1364/CLEO_AT.2021.AW3T.7
Abstract: Absorption spectroscopy is demonstrated with microfluidic devices using collimating graded-index fibers. The optofluidics setup allows for absorption measurements to be performed with 10x smaller volumes than for standard cuvettes but with comparable sensitivity.
Publisher: SPIE
Date: 14-09-2018
DOI: 10.1117/12.2322804
Publisher: OSA
Date: 2016
Publisher: Optica Publishing Group
Date: 28-03-2022
DOI: 10.1364/OE.452945
Abstract: Coupling characteristics between a single mode fiber (SMF) and a waveguide embedded in a glass chip via a graded index fiber (GIF) tip are investigated at a wavelength of 976 nm. The GIF tips comprise a coreless fiber section and a GIF section. A depressed cladding waveguide in a ZBLAN glass chip with a core diameter of 35 μm is coupled with GIF tips that have a range of coreless fiber and GIF lengths. An experimental coupling efficiency as high as 88% is obtained while a numerical simulation predicts 92.9% for the same GIF tip configuration. Since it is measured in the presence of Fresnel reflection, it can be further improved by anti-reflection coating. Additionally, it is demonstrated that a gap can be introduced between the chip waveguide and the GIF tip while maintaining the high coupling efficiency, thus allowing a thin planar optical component to be inserted. The results presented here will enable miniaturization and simplification of photonic chips with integrated waveguides by replacing bulk coupling lenses with integrated optical fibers.
Publisher: Wiley
Date: 03-2017
Publisher: IOP Publishing
Date: 20-10-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2013
Publisher: The Optical Society
Date: 13-04-2016
DOI: 10.1364/OE.24.008832
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-04-2019
Publisher: Optica Publishing Group
Date: 09-09-2016
DOI: 10.1364/OME.6.003097
Publisher: IEEE
Date: 10-2017
Publisher: The Optical Society
Date: 10-04-2015
DOI: 10.1364/OE.23.009924
Publisher: OSA
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 14-06-2011
Publisher: IEEE
Date: 09-2017
Publisher: The Optical Society
Date: 19-06-2015
DOI: 10.1364/OE.23.017067
Publisher: OSA
Date: 2012
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEO_AT.2020.ATU3K.1
Abstract: To meet future data traffic demand, the telecommunications industry is developing optical fiber network architectures that exploit space ision multiplexing (SDM). Femtosecond laser written photonics is a promising platform for SDM end-of-fiber components.
Publisher: MDPI AG
Date: 29-05-2022
DOI: 10.3390/S22114135
Abstract: The rapid development of optofluidic technologies in recent years has seen the need for sensing platforms with ease-of-use, simple s le manipulation, and high performance and sensitivity. Herein, an integrated optofluidic sensor consisting of a pillar array-based open microfluidic chip and caged dye-doped whispering gallery mode microspheres is demonstrated and shown to have potential for simple real-time monitoring of liquids. The open microfluidic chip allows for the wicking of a thin film of liquid across an open surface with subsequent evaporation-driven flow enabling continuous passive flow for s ling. The active dye-doped whispering gallery mode microspheres placed between pillars, avoid the use of cumbersome fibre tapers to couple light to the resonators as is required for passive microspheres. The performance of this integrated sensor is demonstrated using glucose solutions (0.05–0.3 g/mL) and the sensor response is shown to be dynamic and reversible. The sensor achieves a refractive index sensitivity of ~40 nm/RIU, with Q-factors of ~5 × 103 indicating a detection limit of ~3 × 10−3 RIU (~20 mg/mL glucose). Further enhancement of the detection limit is expected by increasing the microsphere Q-factor using high-index materials for the resonators, or alternatively, inducing lasing. The integrated sensors are expected to have significant potential for a host of downstream applications, particularly relating to point-of-care diagnostics.
Publisher: American Chemical Society (ACS)
Date: 19-09-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1NR06866K
Abstract: Annealing of mechanochemically prepared nanocrystalline BaLiF 3 yields F 3 + colour centres that exhibit unique singlet (excited state) to triplet (ground state) luminescence in the NIR.
Publisher: The Optical Society
Date: 11-02-2013
DOI: 10.1364/OE.21.004017
Publisher: Springer Science and Business Media LLC
Date: 12-05-2016
DOI: 10.1557/ADV.2016.342
Publisher: OSA
Date: 2018
Publisher: OSA
Date: 2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NR09255A
Abstract: Cathodoluminescence imaging reveals that the bright green emission from the zero-dimensional perovskite Cs 4 PbBr 6 is due to nanoscale CsPbBr 3 impurities.
Publisher: IEEE
Date: 06-2019
Publisher: Optica Publishing Group
Date: 09-07-2021
DOI: 10.1364/OE.431544
Abstract: Whispering gallery modes (WGMs) in micro-resonators are of interest due to their high Q-factors. Ultra-thin fiber tapers are widely deployed to couple light into micro-resonators but achieving stable and practical coupling for out-of-lab use remains challenging. Here, a new WGM coupling scheme using an exposed-core silica fiber (ECF) is proposed, which overcomes the challenge of using fragile fiber tapers. Microspheres are deposited onto the exposed channel for excitation via the evanescent field of the fiber’s guided modes. The outer jacket of the ECF partially encapsulates the microspheres, protecting them from external physical disturbance. By varying the mode launching conditions in this few-mode ECF, in combination with a Fano resonance effect, we demonstrate a high degree of tunability in the reflection spectrum. Furthermore, we show multi-particle WGM excitation, which could be controlled to occur either simultaneously or separately through controlling the ECF mode launching conditions. This work can bring value towards applications such as optical switches and modulators, multiplexed/distributed biosensing, and multi-point lasing, integrated in a single optical fiber device that avoids fiber post-processing.
Publisher: American Chemical Society (ACS)
Date: 29-05-2015
Abstract: We demonstrate that exposure of nanocrystalline BaFCl:Sm(3+) X-ray storage phosphor to blue laser pulses with peak power densities on the order of 10 GW/cm(2) results in conversion of Sm(3+) to Sm(2+). This photoreduction is found to be strongly power-dependent with an initial fast rate, followed by a slower rate. The photoreduction appears to be orders of magnitude more efficient than that for previously reported systems, and it is estimated that up to 50% of the samarium ions can be photoreduced to the alent state. The main mechanism is most likely based on multiphoton electron-hole creation, followed by subsequent trapping of the electrons in the conduction band at the Sm(3+) centers. Nanocrystalline BaFCl:Sm(3+) is an efficient photoluminescent X-ray storage phosphor with possible applications as dosimetry probes, and the present study shows for the first time that the power levels of the blue light have to be kept relatively low to avoid the generation of Sm(2+) in the readout process. A system comprising the BaFCl:Sm(3+) nanocrystallites embedded into a glass is also envisioned for 3D memory applications.
Publisher: OSA
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 08-2017
DOI: 10.1038/S41598-017-06561-W
Abstract: With the capacity limits of standard single-mode optical fiber fast approaching, new technologies such as space- ision multiplexing are required to avoid an Internet capacity crunch. Few-mode multicore fiber (FM-MCF) could allow for a two orders of magnitude increase in capacity by using the in idual spatial modes in the different cores as unique data channels. We report the realization of a monolithic mode-selective few-mode multicore fiber multiplexer capable of addressing the in idual modes of such a fiber. These compact multiplexers operate across the S + C + L telecommunications bands and were inscribed into a photonic chip using ultrafast laser inscription. They allow for the simultaneous multiplexing of the LP 01 , LP 11a and LP 11b modes of all cores in a 3-mode, 4-core fiber with excellent mode extinction ratios and low insertion losses. The devices are scalable to more modes and cores and therefore could represent an enabling technology for practical ultra-high capacity dense space- ision multiplexing.
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2541099
Publisher: IEEE
Date: 07-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2013
Publisher: The Optical Society
Date: 14-07-2015
DOI: 10.1364/OE.23.018888
Publisher: Springer Science and Business Media LLC
Date: 19-06-2018
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2012
Start Date: 07-2013
End Date: 07-2019
Amount: $2,965,000.00
Funder: Australian Research Council
View Funded Activity