Now showing items 281-300 of 376

    • Radial elasticity of multiwalled carbon nanotubes 

      Palaci, I.; Fedrigo, S.; Brune, Harald; Klinke, C.; Chen, M.; Riedo, Elisa (Georgia Institute of TechnologyAmerican Physical Society, 2005-05)
      We report an experimental and a theoretical study of the radial elasticity of multiwalled carbon nanotubes as a function of external radius. We use atomic force microscopy and apply small indentation amplitudes in order ...
    • Raman Scattering Study of Phase Biaxiality in a Thermotropic Bent-Core Nematic Liquid Crystal 

      Park, Min Sang; Yoon, Beom-Jin; Park, Jung Ok; Prasad, Veena; Kumar, Satyendra; Srinivasarao, Mohan (Georgia Institute of TechnologyAmerican Physical Society, 2010-07)
      Polarized Raman spectroscopy was used to investigate the development of orientational order and the degree of phase biaxiality in a bent-core mesogenic system. The values of the uniaxial order parameters < P-200 > and < ...
    • Rapid curing of positive tone photosensitive polybenzoxazole based dielectric resin by variable frequency microwave processing 

      Tanikella, Ravindra V.; Sung, Taehyun; Bidstrup-Allen, Sue Ann; Kohl, Paul A. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2006-06)
      High performance polymer dielectrics such as polyimides and polybenzoxazoles are used for several applications in the semiconductor industry due to their excellent dielectric and thermomechanical properties. However, ...
    • Rapid detection of bacterial spores using a quartz crystal microbalance (QCM) immunoassay 

      Lee, Sang-Hun; Stubbs, Desmond D.; Cairney, John; Hunt, William D. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2005-08)
      Weaponized spores of a pathogenic bacterium such as Bacillus anthracis are a new critical threat to mankind. The occurrences in New York and south Florida in 2001 showed the potential capability of the spores to be used ...
    • Rapid, broadband two-photon-excited fluorescence spectroscopy and its application to red-emitting secondary reference compounds 

      Makarov, Nikolay S.; Campo, Jochen; Hales, Joel M.; Perry, Joseph W. (Georgia Institute of TechnologyOptical Society of America, 2011-08)
      We present a methodology for rapidly acquiring broadband two-photon absorption (2PA) spectra by means of a compact two-channel femtosecond fluorescence excitation apparatus. This technique is insensitive to differences in ...
    • Reactive conversion of polycrystalline SnO2 into single-crystal nanofiber arrays at low oxygen partial pressure 

      Carney, Carmen M.; Akbar, Sheikh A.; Cai, Ye; Yoo, Sehoon; Sandhage, Kenneth H. (Georgia Institute of TechnologyMaterials Research Society, 2008-10)
      Single-crystal SnO₂ nanofibers have been formed from SnO2 polycrystals via reaction at low oxygen partial pressures. Polycrystalline SnO₂ disks coated with Au nanoparticles were exposed to humid H2/N2 at 700 to 800 °C. ...
    • Refractive-index profiling of azimuthally asymmetric optical fibers by microinterferometric optical phase tomography 

      Bachim, Brent L.; Gaylord, Thomas K.; Mettler, Stephen C. (Georgia Institute of TechnologyOptical Society of America, 2005-05)
      Accurate nondestructive refractive-index profiling is needed in the modeling, design, and manufacturing of optical fibers and fiber devices. Most profile measurement techniques cannot correctly characterize fibers with ...
    • Remote doping of a pentacene transistor: Control of charge transfer by molecular-level engineering 

      Zhao, Wei; Qi, Yabing; Sajoto, Tissa; Barlow, Stephen; Marder, Seth R.; Kahn, Antoine (Georgia Institute of TechnologyAmerican Institute of Physics, 2010-09)
      We demonstrate that holes from a p-doped N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (α-NPD) layer transfer to an adjacent pentacene film. The spatial separation of carriers from dopants, or remote doping, ...
    • Resonant enhancement of two-photon absorption in substituted fluorene molecules 

      Hales, Joel M.; Hagan, David J.; Van Stryland, Eric W.; Schafer, K. J.; Morales, A. R.; Belfield, Kevin D.; Pacher, P.; Kwon, O.; Zojer, Egbert; Brédas, Jean-Luc (Georgia Institute of TechnologyAmerican Institute of Physics, 2004-08)
      The degenerate and nondegenerate two-photon absorption (2PA) spectra for a symmetric and an asymmetric fluorene derivative were experimentally measured in order to determine the effect of intermediate state resonance ...
    • Revisiting the Spread Spectrum Sliding Correlator: Why Filtering Matters 

      Pirkl, Ryan J.; Durgin, Gregory D. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-07)
      A wireless channel sounder based upon the conventional spread spectrum sliding correlator implementation uses unfiltered pseudo-random noise (PN) at both the transmitter and receiver to generate a time-dilated copy of ...
    • RF tag antenna performance on various materials using radio link budgets 

      Griffin, Joshua D.; Durgin, Gregory D.; Haldi, Andreas; Kippelen, Bernard (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2006)
      Passive radio frequency (RF) tags in the UHF and microwave bands have drawn considerable attention because of their great potential for use in many radio frequency identification (RFID) applications. However, more basic ...
    • Role of interface disorder on thermal boundary conductance using a virtual crystal approach 

      Beechem, Thomas; Graham, Samuel; Hopkins, Patrick; Norris, Pamela (Georgia Institute of TechnologyAmerican Institute of Physics, 2007-01-05)
      An analytical method is presented to estimate the effects of structural disorder on the thermal boundary conductance (TBC) between two materials. The current method is an extension of the diffuse mismatch model (DMM) where ...
    • 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 ...