ORCID Profile
0000-0002-4321-3837
Current Organisation
University of Adelaide
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Genomics | Medical Biotechnology Diagnostics (incl. Biosensors) | Optical Physics | Optical Physics not elsewhere classified | Immunological and Bioassay Methods
Publisher: SPIE
Date: 13-09-2012
DOI: 10.1117/12.928494
Publisher: The Optical Society
Date: 16-10-2014
DOI: 10.1364/BOE.5.003975
Publisher: IEEE
Date: 05-2007
Publisher: SPIE
Date: 06-03-2013
DOI: 10.1117/12.2003306
Publisher: Wiley
Date: 19-05-2008
Publisher: Elsevier BV
Date: 07-2010
Publisher: Optica Publishing Group
Date: 2006
DOI: 10.1364/OE.14.009211
Abstract: We report the demonstration of a compact, all-solid-state polymer laser system comprising of a Gallium Nitride (GaN) semiconductor diode laser as the pump source. The polymer laser was configured as a surface emitting, distributed Bragg reflector laser (DBR), based on a novel energy transfer blend of Coumarin 102 and the conjugated polymer poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene). In this configuration, diode pumping was possible both due to the improved quality of the resonators and the improved harvesting of the diode laser light.
Publisher: AIP Publishing
Date: 20-08-2007
DOI: 10.1063/1.2761833
Abstract: A study of the lified spontaneous emission (ASE) properties of three bisfluorene-cored dendrimers in the solid state is reported. The results show that the dendron type has a strong impact on the photoluminescence quantum yield and affects the ASE threshold, the optical gain, and loss coefficients. Optically pumped distributed feedback lasers operating in the blue spectral region were fabricated by spin coating the dendrimer films on top of a two-dimensional corrugated fused silica substrate. A best lasing threshold of 4.5μJ∕cm2 and a slope efficiency of 8.3% were obtained, which demonstrate the high potential of these materials for laser applications.
Publisher: AIP Publishing
Date: 10-09-2018
DOI: 10.1063/1.5040861
Abstract: The probing of physiological processes in living organisms is a grand challenge that requires bespoke analytical tools. Optical fiber probes offer a minimally invasive approach to report physiological signals from specific locations inside the body. This perspective article discusses a wide range of such fiber probes developed at the Australian Research Council Centre of Excellence for Nanoscale BioPhotonics. Our fiber platforms use a range of sensing modalities, including embedded nanodiamonds for magnetometry, interferometric fiber cavities for refractive index sensing, and tailored metal coatings for surface plasmon resonance sensing. Other fiber probes exploit molecularly sensitive Raman scattering or fluorescence where optical fibers have been combined with chemical and immunosensors. Fiber imaging probes based on interferometry and computational imaging are also discussed as emerging in vivo diagnostic devices. We provide ex les to illustrate how the convergence of multiple scientific disciplines generates opportunities for the fiber probes to address key challenges in real-time in vivo diagnostics. These future fiber probes will enable the asking and answering of scientific questions that were never possible before.
Publisher: SPIE
Date: 02-06-2014
DOI: 10.1117/12.2059407
Publisher: SPIE
Date: 17-10-2012
DOI: 10.1117/12.975125
Publisher: Wiley
Date: 02-2021
Abstract: Understanding the upconversion pathways of a rare‐earth dopant is crucial to furthering the use of that material, either toward applications in imaging or elsewhere. This work outlines a new analysis approach that consists of using two synchronized widely‐tunable laser sources to explore the properties of upconverting materials. By examining sensitizer‐free rare‐earth nanoparticles based on a matrix of hexagonal sodium yttrium tetrafluoride (β‐NaYF 4 ) doped with praseodymium but no ytterbium sensitizer, a “non‐degenerate” two‐color upconversion fluorescence at a combined excitation of 1020–850 nm is shown. This insight demonstrates the ability of this technique to locate and interrogate novel upconversion pathways. The dopant level of the nanoparticles could be modified without altering other factors, such as the particle's shape or size, that would also change optical properties and this allows investigation of the dopant‐level dependency of the optical properties. The approach also allows exploration of the time delay domain between the arrival times of the two non‐degenerate excitation pulses, which allows modulation of the brightness from the visible light emissions. This work opens up the parameter space for the systematic synthesis and characterization of new materials with non‐degenerate upconversion emission.
Publisher: Wiley
Date: 17-09-2013
Publisher: MDPI AG
Date: 30-09-2013
DOI: 10.3390/S131013163
Publisher: Wiley
Date: 12-04-2013
Abstract: An organic semiconductor laser, simply fabricated by UV-nanoimprint lithography (UV-NIL), that is pumped with a pulsed InGaN LED is demonstrated. Molecular weight optimization of the polymer gain medium on a nanoimprinted polymer distributed feedback resonator enables the lowest reported UV-NIL laser threshold density of 770 W cm(-2) , establishing the potential for scalable organic laser fabrication compatible with mass-produced LEDs.
Publisher: SPIE
Date: 02-06-2014
DOI: 10.1117/12.2071261
Publisher: IOP Publishing
Date: 22-08-2012
Publisher: AIP Publishing
Date: 22-06-2009
DOI: 10.1063/1.3149827
Abstract: A tunable two-photon pumped solid-state laser based on polyfluorene is reported. A detailed investigation of the two-photon absorption in polyfluorene for both nanosecond and femtosecond time regimes in solution, and solid-state allows the determination of the most favorable conditions for lasing. Tunable distributed feedback lasers are made by spin coating from a polyfluorene solution on corrugated silica substrates and lasing is achieved under two-photon excitation at 640 nm with an absorbed energy density at lasing threshold of 1.3 mJ/cm2. These results highlight an alternative pumping scheme for blue organic semiconductor lasers.
Publisher: IOP Publishing
Date: 02-02-2007
Publisher: Elsevier BV
Date: 08-2014
Publisher: Elsevier BV
Date: 08-2023
Publisher: IEEE
Date: 06-2007
Publisher: Elsevier BV
Date: 02-2008
Publisher: AIP Publishing
Date: 15-06-2009
DOI: 10.1063/1.3152782
Abstract: A blue-emitting distributed feedback laser based on a star-shaped oligofluorene truxene molecule is presented. The gain, loss, refractive index, and (lack of) anisotropy are measured by lified spontaneous emission and variable-angle ellipsometry. The waveguide losses are very low for an organic semiconductor gain medium, particularly for a neat film. The results suggest that truxenes are promising for reducing loss, a key parameter in the operation of organic semiconductor lasers. Distributed feedback lasers fabricated from solution by spin-coating show a low lasing threshold of 270 W/cm2 and broad tunability across 25 nm in the blue part of the spectrum.
Publisher: Informa UK Limited
Date: 12-10-2019
Publisher: SPIE
Date: 02-06-2014
DOI: 10.1117/12.2059416
Publisher: The Optical Society
Date: 10-06-2013
DOI: 10.1364/OE.21.014362
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 07-2011
End Date: 10-2014
Amount: $835,200.00
Funder: Australian Research Council
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