Monday, June 1, 2009 - CLEO

Room 336 Room 337 Room 338 Room 339CLEOCMBB • Laser Sources—ContinuedCMCC • Endoscopic ImagingApplications—ContinuedCMDD • Spectroscopic GasSensing I—ContinuedCMEE • Ultraviolet and BlueLight Emitters—ContinuedCMBB5 • 2:30 p.m.Nonlinear Absorption and Carrier Dynamics inSlab-Coupled Optical Waveguide Amplifiers, AliR. Motamedi 1 , Erich P. Ippen 1 , Jason J. Plant 2 , JosephP. Donnelly 2 , Paul W. Juodawlkis 2 ; 1 MIT, USA, 2 MITLincoln Lab, USA. Loss due to the two-photonabsorption and free-carrier absorption processesbecomes a dominant factor for ultrashort-pulseamplification, leading to lower saturation energy.TPA and FCA coefficients are measured to be65cm/GW and 7x10 -17 cm 2 , respectively.CMCC5 • 2:30 p.m.Microfabricated out-of-Plane Scanning Microlensfor Raman Spectroscopy, Chin Pang BillySiu 1 , Haishan Zeng 2 , Mu Chiao 1 ; 1 Univ. of BritishColumbia, Canada, 2 British Columbia CancerRes. Ctr., Canada. We present a microfabricatedout-of-plane scanning microlens for miniaturizedRaman Spectroscopy. The out-of-plane actuationis electrostatic driven and achieves 90 μm scanrangeat 1k Hz. A Raman spectrum analysis onthe drug, Tylenol, is reported.CMDD4 • 2:30 p.m.Compact Gas Sensing System Based on Mid-Infrared LED and Resonant Detection withQuartz Tuning Fork, Ulrike Willer, Claus Romano,Wolfgang Schade; Clausthal Univ. of Technology,Germany. A Winston cone, used simultaneouslyas absorption cell, concentrates the radiation of amid-infrared LED onto a prong of a quartz tuningfork acting as detector, providing a compact andcost efficient mid-infrared sensing system.CMEE4 • 2:30 p.m.The Effects of Increasing AlN Mole Fraction onthe Performance of AlGaN Based UltravioletLight Emitting Diode Active Regions, AnandV. Sampath 1 , Gregory A. Garrett 1 , Wendy L.Sarney 1 , H. Shen 1 , Michael Wraback 1 , James R.Grandusky 2 , Leo J. Showalter 2 ; 1 ARL, USA, 2 CrystalIS, USA. Time-resolved photoluminescence andtransmission electron microscopy results suggestthat the density of point defects may have a moresignificant role than threading dislocations in theperformance of UVLED AlGaN active regionsemitting at shorter wavelengths.CMBB6 • 2:45 p.m.Mode-Locking via Active Gain Modulation inQuantum Cascade Lasers, Lyuba Kuznetsova 1 , C.Y. Wang 1 , V. M. Gkortsas 2 , L. Diehl 1 , F. Kärtner 2 ,M. A. Belkin 3 , A. Belyanin 4 , X. Li 1 , D. Ham 1 , H.Schneider 5 , H. C. Liu 6 , Federico Capasso 1 ; 1 HarvardUniv., USA, 2 MIT, USA, 3 Univ. of Texas at Austin,USA, 4 Texas A&M Univ., USA, 5 Inst. of Ion BeamPhysics and Materials Res., Germany, 6 Natl. Res.Council, Canada. A mode-locking mechanismby active gain modulation is studied numericallyand experimentally. The parameter window for theemission of stable pulse trains was found. Pulsesas short as 3ps (~0.5pJ) were characterized bysecond-order autocorrelation.CMCC6 • 2:45 p.m.Fiber-Optic Endomicroscopy for Intrinsic Two-Photon Fluorescence Imaging of Epithelial Cellsand Tissues, Yicong Wu 1 , Jiefeng Xi 1 , YongpingChen 1 , Michael J. Cobb 1 , Ming-Jun Li 2 , Xingde Li 1 ;1Dept. of Bioengineering, Univ. of Washington,USA, 2 Science and Technology Div., CorningInc., USA. An endomicroscope with enhancedsignal collection efficiency was developed usingcustomized double-clad fiber and asphericalcompound-lens. Ex vivo two-photon fluorescenceimaging of epithelial tissues was demonstratedfor the first time with an all-fiber-optic scanningendomicroscope.CMDD5 • 2:45 p.m.Location-Resolved Gas Concentration DetectionUsing Frequency-Shifted Interferometry,Fei Ye, Li Qian, Bing Qi; Univ. of Toronto, Canada.We use frequency-shifted interferometry to detectthe concentrations of the same gas species at differentlocations and in different mixtures by accuratelycorrecting the spectral shadowing effect.Different gas species are also detected.CMEE5 • 2:45 p.m.1-D Carrier Localization and Effective QuantumWire Behavior inside “Wrinkled” QWs Depositedon Textured GaN, Spilios Riyopoulos 1 , TheodoreMoustakas 2 ; 1 SAIC, USA, 2 Boston Univ., USA.Ridges among intersecting quantum wells depositedon textured GaN behave as 1-D quantum wiresdue to geometry and polarization effects. Carrierlocalization, carrier accumulation and emissionblue shifting are derived theoretically.Monday, June 1CMBB7 • 3:00 p.m.Coherent Dynamics of One- and Two-PhotonStates in a Strongly Coupled Single QuantumDot-Cavity System, Jacek Kasprzak 1 , WolfgangLangbein 1 , S. Reitzenstein 2 , C. Kistner 2 , C. Schneider2 , M. Strauss 2 , S. Höfling 2 , A. Forchel 2 ; 1 CardiffUniv., UK, 2 Technische Physik, Univ. Würzburg,Germany. Heterodyne spectral interferometry isemployed to perform four-wave mixing spectroscopyon a strongly-coupled system of an excitonconfined in a single quantum dot and a photonmode of a pillar microcavtity.CMCC7 • 3:00 p.m.Handheld Single-Cell-Layer Optical SectioningReflectance Confocal Microscope forInterventional Imaging, Karthik Kumar 1 , RonyAvritscher 2 , David C. Madoff 2 , Xiaojing Zhang 1 ;1Univ. of Texas at Austin, USA, 2 M. D. AndersonCancer Ctr., Univ. of Texas, USA. We introduce ahandheld reflectance confocal microscope providing4.2μm axial, 0.5μm lateral resolution, and200x125μm field based on novel CMOS-MEMS2-axis scanning micromirrors. Examination of exvivo swine liver indicates applicability to clinicalimage-directed intervention.CMDD6 • 3:00 p.m.Fourier Transform Spectrometry with a NearInfrared Supercontinuum Source, Chris A.Michaels, Tony Masiello, Pamela M. Chu; NIST,USA. Near-infrared Fourier transform absorptionspectrometry with a supercontinuum (SC) sourceis demonstrated for trace methane detection. TheSC source allows for long distance propagationwhile exhibiting amplitude noise ten times greaterthan comparable incandescent sources.CMEE6 • 3:00 p.m.Towards Room Temperature ElectricallyPumped Blue Vertical Cavity Surface EmittingLasers, Gatien Cosendey, Eric Feltin, AntoninoCastiglia, Jean-François Carlin, Alexei Altoukhov,Jacques Levrat, Gabriel Christmann, Raphael Butté,Nicolas Grandjean; École Polytechnique Fédéralede Lausanne, Switzerland. We report strategiesto achieve lasing in electrically driven VCSELs at300K, namely high quality microcavity suited forelectrical injection, use of a ZnO contact with acurrent confinement layer, and oxidized AlInN/GaN Bragg reflectors.3:15 p.m.–3:45 p.m. Coffee Break, Concourse LevelNOTES________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________70CLEO/IQEC and PhotonXpo 2009 • May 31–June 5, 2009