Now showing items 293-312 of 376

    • Role of recording geometry in the performance of spectral diversity filters with spherical beam volume holograms 

      Hsieh, Chaoray; Momtahan, Omid; Karbaschi, Arash; Adibi, Ali; Sullivan, Michael E.; Brady, David J. (Georgia Institute of TechnologyOptical Society of America, 2005-01)
      We present experimental demonstrations of spectral diversity filters with spherical beam volume holograms for multimodal multiplex spectroscopy. Major properties of filters under diffuse-light illumination are discussed. ...
    • Room-temperature chemical vapor deposition and mass detection on a heated atomic force microscope cantilever 

      Sunden, Erik Oscar; Wright, Tanya L.; Lee, Jung Chul; King, William P.; Graham, Samuel (Georgia Institute of TechnologyAmerican Institute of Physics, 2006-01)
      This letter reports the localized room-temperature chemical vapor deposition of carbon nanotubes (CNTs) onto an atomic force microscope cantilever having an integrated heater, using the cantilever self-heating to provide ...
    • A row-action based L₁-minimization approach to robust fluorescent tomography 

      Mohajerani, Pouyan; Behrooz, Ali; Eftekhar, Ali A.; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-10)
      We present a row-action method based on minimization of the L₁ norm for improving the accuracy of fluorescent tomography in reconstruction of fluorescent objects. The method is validated using a CW system and milk-based ...
    • Sea of polymer pillars: Compliant wafer-level electrical-optical chip I/O interconnections 

      Bakir, Muhannad S.; Gaylord, Thomas K.; Martin, Kevin P.; Meindl, James D. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2003-11)
      An electrical–optical chip input–output (I/O) interconnection technology called sea of polymer pillars (SoPP) is presented. SoPP provides highly process-integrated and mechanically flexible (compliant) electrical–optical ...
    • Self-sustained gigahertz electronic oscillations in ultrahigh-Q photonic microresonators 

      Soltani, Mohammad; Yegnanarayanan, Siva; Li, Qing; Eftekhar, Ali Asghar; Adibi, Ali (Georgia Institute of TechnologyAmerican Physical Society, 2012-05)
      We report on theoretical and experimental observations of self-sustained fast [gigahertz (GHz)] electronic oscillations resulting from coupled electron-photon dynamics in ultrahigh-Q Si microdisk resonators with cw pumping. ...
    • Sensitivity variation in two-center holographic recording 

      Momtahan, Omid; Cadena, George H.; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2005-10)
      An experimental study of variation of sensitivity with recording and sensitizing intensities in two-center recording is presented. The experimental results are in good agreement with the theoretical predictions. It is shown ...
    • Shallow trap states in pentacene thin films from molecular sliding 

      Kang, Joo H.; da Silva Filho, Demetrio A.; Brédas, Jean-Luc; Zhu, X.-Y. (Georgia Institute of TechnologyAmerican Institute of Physics, 2005-04)
      Petacene is one of the most promising organic semiconductors for thin-film transistors. Transport measurements in the past have established the presence of shallow traps but their origins have remained a mystery. Here we ...
    • Simple and efficient software-based stabilized holographic recording system 

      Cadena, George H.; Momtahan, Omid; Adibi, Ali (Georgia Institute of TechnologySociety of Photo-optical Instrumentation Engineers (SPIE), 2006-12)
      A simple, inexpensive, and efficient stabilized holographic recording setup is described which precludes the destructive fringe movement encountered in long-lasting holographic exposures. Utilizing a straightforward ...
    • A simple method for measurement of photoacid generator photoreaction kinetics in formulated, chemically amplified photoresist films 

      Lee, Cheng-Tsung; Yueh, Wang; Roberts, Jeanette; Henderson, Clifford L. (Georgia Institute of TechnologyElectrochemical Society, 2007)
      A method which utilizes experimental measurement and modeling of photoacid-catalyzed deprotection rates obtained via Fourier transform infrared spectroscopy has been developed for determining photoacid generator PAG ...
    • Simulations of the emission spectra of fac-tris(2-phenylpyridine) iridium and Duschinsky rotation effects using the Herman-Kluk semiclassical initial value representation method 

      Wu, Yinghua; Brédas, Jean-Luc (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-12-07)
      The phosphorescent emission spectra of fac-tris(2-phenylpyridine) iridium [fac-Ir(ppy)₃] due to the lowest triplet T1 and T2 states are simulated using the harmonic oscillator approximation for the S0, T₁, and T₂potential ...
    • Simultaneous two-dimensional phononic and photonic band gaps in opto-mechanical crystal slabs 

      Mohammadi, Saeed; Eftekhar, Ali Asghar; Khelif, Abdelkrim; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2010-04)
      We demonstrate planar structures that can provide simultaneous two-dimensional phononic and photonic band gaps in opto-mechanical (or phoxonic) crystal slabs. Different phoxonic crystal (PxC) structures, composed of square, ...
    • Single sensor that outputs narrowband multispectral images 

      Kong, Linghua; Yi, Dingrong; Sprigle, Stephen; Wang, Fengtao; Wang, Chao; Liu, Fuhan; Adibi, Ali; Tummala, Rao (Georgia Institute of TechnologySociety of Photo-Optical Instrumentation Engineers, 2010-01)
      We report the work of developing a hand-held (or miniaturized), low-cost, stand-alone, real-time-operation, narrow bandwidth multispectral imaging device for the detection of early stage pressure ulcers.
    • Single-component molecular resists containing bound photoacid generator functionality 

      Lawson, Richard A.; Tolbert, Laren M.; Henderson, Clifford L. (Georgia Institute of TechnologySociety of Photo-optical Instrumentation Engineers (SPIE), 2010-01)
      A series of single component molecular resists were designed, synthesized, characterized, and patterned using 100 keV e-beam lithography. An onium salt PAG based single component system (referred to here as TAS) which ...
    • Singlet-triplet splitting of geminate electron-hole pairs in conjugated polymers 

      Kadashchuk, A.; Vakhnin, A.; Blonski, I.; Beljonne, David; Shuai, Zhigang; Arkhipov, V. I.; Heremans, P.; Emelianova, E. V.; Bassler, H.; Brédas, Jean-Luc (Georgia Institute of TechnologyAmerican Physical Society, 2004-08)
      The singlet-triplet splitting of geminate polaron pairs in a ladder-type conjugated polymer has been studied by the thermally stimulated luminescence technique. The energy gap separating the singlet and triplet states of ...
    • Solution doping of organic semiconductors using air-stable n-dopants 

      Qi, Yabing; Mohapatra, Swagat K.; Kim, Sang Bok; Barlow, Stephen; Marder, Seth R.; Kahn, Antoine (Georgia Institute of TechnologyAmerican Institute of Physics, 2012-02)
      Solution-based n-doping of the polymer poly{[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} [P(NDI₂OD-T₂)] and the small molecule 6,13-bis(tri(isopropyl)silylethyny ...
    • Solution-processible high-permittivity nanocomposite gate insulators for organic field-effect transistors 

      Kim, P.; Domercq, Benoit; Jones, Simon C.; Hotchkiss, Peter J.; Marder, Seth R.; Kippelen, Bernard; Perry, Joseph W.; Zhang, Xiaohong (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-07-07)
      We report on solution-processible high permittivity nanocomposite gate insulators based on BaTiO₃ nanoparticles, surface-modified with a phosphonic acid, in poly(4-vinylphenol) for organic field-effect transistors. The use ...
    • Solvent effects on the vibronic one-photon absorption profiles of dioxaborine heterocycles 

      Wang, Yan-Hua; Halik, Marcus; Wang, Chuan-Kui; Marder, Seth R.; Luo, Yi (Georgia Institute of TechnologyAmerican Institute of Physics, 2005-11)
      The vibronic profiles of one-photon absorption spectra of dioxaborine heterocycles in gas phase and solution have been calculated at the Hartree-Fock and density-functional-theory levels. The polarizable continuum model ...
    • Specific contact resistance at metal/carbon nanotube interfaces 

      Jackson, Roderick; Graham, Samuel (Georgia Institute of TechnologyAmerican Institute of Physics, 2009-01-05)
      In this report, the specific contact resistance between a thin film single wall carbon nanotube electrode and a deposited silver contact was measured. The specific contact resistance was found to be 20 mΩ cm², which is ...
    • Spherical beam volume holograms for spectroscopic applications: modeling and implementation 

      Momtahan, Omid; Hsieh, Chaoray; Karbaschi, Arash; Adibi, Ali; Sullivan, Michael E.; Brady, David J. (Georgia Institute of TechnologyOptical Society of America, 2004-12)
      The spherical beam volume hologram, recorded by a plane wave and a spherical beam, is investigated for spectroscopic applications in detail. It is shown that both the diffracted and the transmitted beam can be used for ...
    • SPICE Optimization of Organic FET Models Using Charge Transport Elements 

      Vaidya, Vaibhav; Kim, Jungbae; Haddock, Joshua N.; Kippelen, Bernard; Wilson, Denise (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-01)
      We report on a modeling technique that uses charge transport equations to calculate channel current in organic field effect transistors (OFETs) by numerical solution in. the SPICE simulation program. SPICE is also used to ...