ORCID Profile
0000-0002-0398-7520
Current Organisation
The University of Edinburgh
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Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2013
Publisher: The Optical Society
Date: 06-01-2015
DOI: 10.1364/BOE.6.000277
Publisher: SPIE
Date: 19-10-2012
DOI: 10.1117/12.978993
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2012
Publisher: Optica Publishing Group
Date: 08-12-2009
DOI: 10.1364/OE.17.023522
Publisher: The Optical Society
Date: 14-01-2014
DOI: 10.1364/OE.22.001372
Publisher: The Optical Society
Date: 27-01-2011
DOI: 10.1364/OE.19.002720
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2012
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2009
Publisher: Wiley
Date: 12-12-2011
Abstract: In this paper, the size effects on the efficiency droop (ED) in blue InGaN/GaN quantum well light emitting diode are investigated. The smaller size LEDs can work well under much higher power density, especially when the size is reduced to under 40 micro‐meters. It shows a weaker ED in these small LEDs. Time correlated single photon counting (TCSPC) measurements show a longer electroluminescence lifetime for smaller size LEDs, which implicates the nonradiative recombination is reduced. It is likely due to Aguer recombination reduction by quantum well (QW) band flatened with the device size decreasing. Cathodoluminescence results indicates that the strain in QWs is relaxed both in the whole pillar and along radial direction of the pillar. The better performance of the smaller size LED is likely attributed to strain relaxation (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Publisher: IEEE
Date: 11-2010
Publisher: IEEE
Date: 10-2009
Publisher: Optica Publishing Group
Date: 02-03-2021
DOI: 10.1364/OE.416143
Abstract: Experimental quantum key distribution through free-space channels requires accurate pointing-and-tracking to co-align telescopes for efficient transmission. The hardware requirements for the sender and receiver could be drastically reduced by combining the detection of quantum bits and spatial tracking signal using two-dimensional single-photon detector arrays. Here, we apply a two-dimensional CMOS single-photon avalanche diode detector array to measure and monitor the single-photon level interference of a free-space time-bin receiver interferometer while simultaneously tracking the spatial position of the single-photon level signal. We verify an angular field-of-view of 1.28° and demonstrate a post-processing technique to reduce background noise. The experimental results show a promising future for two-dimensional single-photon detectors in low-light level free-space communications, such as quantum communications.
Publisher: The Optical Society
Date: 14-10-2014
DOI: 10.1364/OL.39.006013
Publisher: Wiley
Date: 26-05-2009
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Robert Henderson.