Dr. Benoit Jack Eloi Guilhabert
Institute of Photonics, University of Strathclyde, Glasgow, Glasgow City, UK
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Academic Career Length
20Years (2007-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications3 December 2012 in Applied Physics Letters
Journal Article
Pengfei TianJMJonathan Mckendry
Jonathan Mckendry
Zheng GongBenoit Jack Eloi GuilhabertIWIan M. Watson
Ian M. WatsonMDMartin D. Dawson
Martin D. Dawson +3
The mechanisms of size-dependent efficiency and efficiency droop of blue InGaN micro-pixel light emitting diodes (μLEDs) have been investigated experimentally and by simulation. Electrical characterisation confirms the improvement of current spreading for smaller μLEDs, which enables the achievement of the higher efficiency at high injection current densities. Owing to the higher ratio of sidewall perimeter to mesa area of smaller μLEDs, a lower efficiency was observed at a low injection current density, resulting from defect-related Shockley-Read-Hall non-radiative recombination. We demonstrate that such sidewall etch defects can be partially recovered by increased thermal annealing time, consequently improving the efficiency at low current densities.
8 July 2010 in IEEE Photonics Technology Letters
Journal Article
JMJonathan Mckendry
Jonathan MckendryRGRichard P. Green
Richard P. Green
AKA. E. Kelly
A. E. Kelly
Zheng GongBenoit Jack Eloi GuilhabertMDMartin D. Dawson
Martin D. Dawson +2
The high-frequency modulation of individual pixels in III-nitride-based micro-pixel light-emitting diode arrays, where each array consists of 16 × 16 individually addressable 72-μm-diameter pixels, are reported. The devices investigated have peak emission wavelengths at 370, 405, and 450 nm, respectively. The optical -3-dB modulation bandwidth of a typical pixel from the 450-nm-emitting device was found to be approximately 245 MHz. Data transmission at rates of up to 1 Gb/s is demonstrated from a single pixel emitting at 450 nm, using on-off keying nonreturn-to-zero modulation, with a bit-error ratio of less than 1 × 10-10. Such devices have potential for free-space or fiber-coupled visible light communications.
1 February 2011 in Optics Express
Journal Article
YCYujie Chen
Yujie ChenJHJohannes Herrnsdorf
Johannes HerrnsdorfBenoit Jack Eloi GuilhabertYZYanfeng Zhang
Yanfeng Zhang
IWIan M. Watson
Ian M. WatsonMDMartin D. Dawson
Martin D. Dawson +2
We report random laser action in a system where optical amplification is provided by colloidal quantum dots (CQDs). This system is obtained by depositing from solution CdSe/ZnS core-shell CQDs into rough micron-scale grooves fabricated on the surface of a glass substrate. The combination of CQD random packing and of disordered structures in the glass groove enables gain and multiple scattering. Upon optical excitation, random laser action is triggered in the system above a 25-mJ/cm2 threshold. Single-shot spectra were recorded to study the emission spectral characteristics and the results show the stability of the laser mode positions and the dominance of the modes close to the material gain maximum.
1 May 2020 in Science
Journal Article
KPKun Peng
Kun PengDJDimitars Jevtics
Dimitars JevticsFZFanlu Zhang
Fanlu Zhang
SSSabrina Sterzl
Sabrina SterzlDDDjamshid A. Damry
Djamshid A. DamryMJMichael B. Johnston
Michael B. Johnston +9
Nanowire-based THz detection: Terahertz (THz) radiation is an interesting region of the electromagnetic spectrum lying between microwaves and infrared. Non-ionizing and transparent to most fabrics, it is finding application in security screening and imaging but is also being developed for communication and chemical sensing. To date, most THz detectors have focused just on signal intensity, an effort that discards half the signal in terms of the full optical state, including polarization. Peng et al. developed a THz detector based on crossed nanowires (arranged in a hash structure) that is capable of resolving the full state of the THz light. The approach provides a nanophotonic platform for the further development of THz-based technologies. Science , this issue p. 510
14 April 2009 in IEEE Photonics Technology Letters
Journal Article
JMJonathan Mckendry
Jonathan MckendryBRBruce R. Rae
Bruce R. Rae
Zheng GongKMKeith R. Muir
Keith R. Muir
Benoit Jack Eloi GuilhabertRHRobert Henderson
Robert Henderson +4
We report the fabrication and characterization of an ultraviolet (370 nm) emitting AlInGaN-based micro-light- emitting diode (micro-LED) array integrated with complementary metal-oxide-semiconductor control electronics. This configuration allows an 8 × 8 array of micro-LED pixels, each of 72-mum diameter, to be individually addressed. The micro-LED pixels can be driven in direct current (dc), square wave, or pulsed operation, with linear feedback shift registers (LFSRs) allowing the output of the micro-LED pixels to mimic that of an optical data transmitter. We present the optical output power versus drive current characteristics of an individual pixel, which show a micro-LED output power of up to 570 muW in dc operation. Representative optical pulse trains demonstrating the micro-LEDs driven in square wave and LFSR modes, and controlled optical pulsewidths from 300 ps to 40 ns are also presented.
2 April 2015 in Optics Express
Journal Article
ATA. J. Trindade
A. J. TrindadeBenoit Jack Eloi GuilhabertEXE. Y. Xie
E. Y. Xie
RFR. Ferreira
R. FerreiraJMJonathan Mckendry
Jonathan MckendryMDM. D. Dawson
M. D. Dawson +6
We report the transfer printing of blue-emitting micron-scale light-emitting diodes (micro-LEDs) onto fused silica and diamond substrates without the use of intermediary adhesion layers. A consistent Van der Waals bond was achieved via liquid capillary action, despite curvature of the LED membranes following release from their native silicon growth substrates. The excellence of diamond as a heat-spreader allowed the printed membrane LEDs to achieve optical power output density of 10 W/cm2 when operated at a current density of 254 A/cm2. This high-current-density operation enabled optical data transmission from the LEDs at 400 Mbit/s.
About Me
Benoit Guilhabert is currently a doctor in the Department of
Physics at the University of Strathclyde, Glasgow, United Kingdom. He has
developed a number of novel microfabrication processes, such as the design and
construction of custom laser and LED direct-write lithography tools, or the
full design and implementation of custom transfer-printing tools; The latter comes with added capabilities such
as full deterministic alignment capabilities, improved motion systems, and
computer-controlled alignment processes. In addition, he contributed to the
development of LED color conversion and laser devices using organic
semiconductor (OLED) materials and colloidal quantum dots. This included the
fabrication, measurement, and application of these devices in visible light
communications, for example and also encompasses the demonstration of novel
schemes, such as arrays of mechanically flexible lasers with emission over the
visible spectral range for biological sensing applications. His areas of
activity are centered around heterogeneous integration, microfabrication with a
specific focus on Gallium Nitride light-emitting diodes and photonic integrated
circuits, optical characterization, and organic and colloidal semiconductors.
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