Tuesday, 3 May 2011 - CLEO

Room 327 Room 336 Room 337 Room 338
CLEO: Science
& Innovations
CLEO: Applications
& Technology
CLEO: QELS-
Fundamental Science
CLEO: Science
& Innovations
CTuP • Novel Semiconductor
Lasers—Continued
ATuE • Sensors and Imaging
for Scientific and Security
Applications—Continued
QTuK • Optical Processes in
Graphene—Continued
CTuQ • Ultrafast and Broadband
Nonlinear Optics—Continued
CTuP5 • 14:45
Room Temperature GaAs/AlGaAs Quantum
Cascade Lasers with InGaP and InAlP Waveguides,
Dmitry G. Revin 1 , Chris Atkins 1 , James P.
Commin 1 , John W. Cockburn 1 , Yang Qiu 1 , Thomas
Walther 1 , Ken Kennedy 1 , Andrey B. Krysa 1 ; 1 The
Univ. of Sheffield, UK. We report the development
of high temperature pulsed GaAs/AlGaAs
quantum cascade lasers emitting in the wavelength
range of 9 µm with threshold current density as low
as 4.3 kA/cm 2 at 300K.
ATuE5 • 14:45 Invited
Terahertz spectral imaging for drug inspection,
Kodo Kawase 1,2 , Aya Iwasaki 2 , Takayuki Shibuya 1,2 ;
1
RIKEN, Japan; 2 Nagoya Univ., Japan. The aim of
this study was to apply terahertz technology for
screening and identification of drugs-of-abuse in
mail. We have introduced terahertz spectral imaging
and diffuse reflectance spectroscopy using our
tunable THz parametric sources.
QTuK5 • 14:45
Microscopic Study of Carrier Multiplication
in Graphene, Torben Winzer 1 , Andreas Knorr 1 ,
Ermin Malic 1 ; 1 Institut für Theoretische Physik,
Technische Universität Berlin, Germany. Microscopic
calculations allow to track the ultrafast
relaxation of optically excited charge carriers in
graphene. Its unique band structure accounts for
efficient Auger-type scattering channels resulting
in a significant carrier multiplication.
CTuQ4 • 14:45
Temporal contrast improvement of femtosecond
pulses by a self-diffraction process in a Kerr
bulk medium, Jun Liu 1 ; 1 UEC, Japan, Japan. We
improved the temporal contrast of a femtosecond
pulse by more than four orders magnitude of its
incident pulse using self-diffraction process in a
0.5-mm-thick glass plate. The energy transform
efficiency is about 12%.
CTuP6 • 15:00
Catastrophic Optical Damage at Front and Rear
Facets of 975 nm Emitting Diode Lasers, Martin
Hempel 1 , Jens W. Tomm 1 , Mathias Ziegler 2 , Thomas
Elsässer 1 , Nicolas Michel 3 , Michel Krakowski 3 ;
1
Bereich C, Max-Born-Institut, Germany; 2 BAM
Federal Inst. for Materials Research and Testing,
Germany; 3 Alcatel-Thales III-V Lab, France. Catastrophic
facet degradation at highest power levels
is analyzed for different diode laser waveguide
architectures. Degradation events at front and rear
facet are analyzed and predominant damage at the
rear is elucidated for Al-free waveguides.
QTuK6 • 15:00
Observation of Image States in Graphene on
Ir(111) by Two-Photon Photoemission, Jerry
I. Dadap 1 , Marko Kralj 2 , Marin Petrovich 2 , Kevin
Knox 1 , Rohan Bhandari 1 , Po-Chun Yeh 1 , Nader
Zaki 1 , Richard M. Osgood 1 ; 1 Microelectronics Sciences
Laboratories, Columbia Univ., USA; 2 Inst.
of Physics, Croatia. We report observation of
image states of graphene on Ir(111) using twophoton
photoemission. We also investigate the
2PPE dependence on graphene coverage, photon
energy, and electron scattering angle to study the
graphene-substrate interaction.
CTuQ5 • 15:00
Optimally Chirped CARS Spectroscopy Using
Fiber Stretchers, Carsten Cleff 1 , Jörn Epping 1 , Petra
Gross 1 , Carsten Fallnich 1 ; 1 Inst. of Applied Physics,
Westfälische Wilhelms-Universität Münster, Germany.
High spectral resolution CARS spectroscopy
is performed using a femtosecond laser system. By
employing fiber stretchers for easy pulse delivery
and for optimally chirping, the spectral resolution
was improved by a factor >16.
Tuesday, 3 May
CTuP7 • 15:15
Lasing in metal-coated GaN nano-stripe at room
temperature, Yow-Gwo Wang 1 , Cheng-Chang
Chen 1 , Ching-Hsueh Chiu 1 , Ming-Yen Kuo 2 , Min-
Hsiung Shih 1,2 , Hao-chung Kuo 1 ; 1 Department of
Photonic & Inst. of Electro-Optical Engineering,
National Chiao Tung Univ., Taiwan; 2 Research
Center for Applied Sciences, Academia Sinica,
Taiwan. We demonstrated lasing in a metal-coated
GaN nano-stripe under room temperature pulsed
operation, and the lasing mode at 370nm were
observed. Aluminum and SiO 2 layers were coated
on the undoped GaN nano-stripe.
ATuE6 • 15:15
High-Speed THz Biochip Reader System,
Christian Debus 1 , Gunnar Spickermann 1 , Michael
Nagel 2 , Peter Haring Bolívar 1 ; 1 High Frequency
and Quantum Electronics, Univ. of Siegen, Germany;
2 Inst. of Semiconductor Electronics, RWTH
Aachen, Germany. A new all-electronic system is
presented for THz biochip read-out. It is superior
to common time-domain spectroscopy systems
in terms of size, speed and costs. Exemplary biochip
measurements are compared to TDS based
read-out data.
QTuK7 • 15:15
Identifying Edge Chirality of Graphene Using
Polarization Resolved μ-Raman Spectroscopy,
Milan Begliarbekov 1 , Onejae Sul 2 , Sokratis Kalliakos
1 , Eui-Hyeok Yang 2 , Stefan Strauf 1 ; 1 Physics
& Engineering Physics, Stevens Inst. of Technology,
USA; 2 Mechanical Engineering, Stevens Inst. of
Technology, USA. Development of optoelectronic
devices based on the bandgap of nanosctructured
graphene requires knowledge of edge chirality. We
show that polarization resolved Raman spectroscopy
can be used to determine the fractional edge
composition of graphene.
14:00–16:00 Market Focus: Meeting Clinical Needs with Photonics, Exhibit Hall F, 100 Level
CTuQ6 • 15:15
Crystal structure measured by nonlinear absorption
using 3.1 μm femtosecond laser pulses, Sean
E. Kirkwood 1,2 , Sarah Golin 1,2 , Olivier Chalus 3 ,
Alexandre Thai 3 , Jens Biegert 3,4 , Dennis D. Klug 1 ,
David M. Rayner 1 , Paul B. Corkum 1,2 ; 1 National Research
Council Canada, Canada; 2 Univ. of Ottawa,
Canada; 3 ICFO - Institut de Ciencies Fotoniques,
Spain; 4 ICREA - Instituci Catalana de Recerca i
Estudis Avanats, Spain. Infrared multiphoton adsorption
at 3.1 μm in crystalline GaAs depends on
the crystal alignment to the laser polarization. This
reveals the roles electron mass and band structure
play in multiphoton ionization inside solids.
15:30–16:00 Coffee Break, Exhibit Halls E and F, 100 Level
NOTES
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110 CLEO: 2011 • 1–6 May 2011