Now showing items 122-141 of 376

    • Gains for RF tags using multiple antennas 

      Griffin, Joshua D.; Durgin, Gregory D. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2008-02)
      Backscatter radio systems, including high frequency radio frequency identification (RFID), operate in the dyadic backscatter channel - a two-way pinhole channel that has deeper small-scale fades than that of a conventional ...
    • A general diagrammatic algorithm for contraction and subsequent simplification of second-quantized expressions 

      Bochevarov, Arteum D.; Sherrill, C. David (Georgia Institute of TechnologyAmerican Institute of Physics, 2004-08)
      We present a general computer algorithm to contract an arbitrary number of second-quantized expressions and simplify the obtained analytical result. The functions that perform these operations are a part of the program ...
    • General methods for designing single-mode planar photonic crystal waveguides in hexagonal lattice structures 

      Wu, N.; Javanmard, M.; Momeni, Babak; Soltani, Mohammad; Adibi, Ali; Xu, Yong; Lee, Reginald K. (Georgia Institute of TechnologyOptical Society of America, 2003-06)
      We systematically investigate and compare general methods of designing single mode photonic crystal waveguides in a two-dimensional hexagonal lattice of air holes in a dielectric material. We apply the rather general methods ...
    • Global optimization of sensitivity and dynamic range for two-center holographic recording 

      Momtahan, Omid; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2003-03)
      The performance of two-center holographic recording is theoretically studied and described in detail. We present a systematic method for global optimization of two-center holographic recording. Whereas the method presented ...
    • Growth direction and morphology of ZnO nanobelts revealed by combining in situ atomic force microscopy and polarized Raman spectroscopy 

      Lucas, Marcel; Wang, Zhong Lin; Riedo, Elisa (Georgia Institute of TechnologyAmerican Physical Society, 2010-01)
      Control over the morphology and structure of nanostructures is essential for their technological applications, since their physical properties depend significantly on their dimensions, crystallographic structure, and growth ...
    • Heat dissipation in high-power GaN electronics on thermally resistive substrates 

      Christensen, Adam; Doolittle, William Alan; Graham, Samuel (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2005-08)
      The heat dissipation in GaN devices grown on low thermal conductivity lithium gallate (LGO) substrates was investigated. The thermal conductivity of single-crystal LGO was measured utilizing the 3ω technique for ...
    • Hexagonal and cubic TiOF₂ 

      Shian, Samuel; Sandhage, Kenneth H. (Georgia Institute of TechnologyInternational Union of Crystallography, 2010-08)
      The chemical, electrochemical, optical and electro-optical properties of titanium oxyfluoride, TiOF₂, have led to interest in this compound for a number of applications. Prior analyses have indicated that TiOF₂possesses a ...
    • High accuracy ab initio studies of Li-6(+), Li-6(-), and three isomers of Li-6 

      Temelso, Berhane; Sherrill, C. David (Georgia Institute of TechnologyAmerican Institute of Physics, 2005-02)
      The structures and energetics of Li6+, Li6− and three isomers of Li6 are investigated using the coupled-cluster singles, doubles and perturbative triples [CCSD(T)] method with valence and core-valence correlation consistent ...
    • High quality planar silicon nitride microdisk resonators for integrated photonics in the visible wavelength range 

      Hosseini, Ehsan Shah; Yegnanarayanan, Siva; Atabaki, Amir Hossein; Soltani, Mohammad; Adibi, Ali (Georgia Institute of TechnologyOptical Society of America, 2009-08)
      High quality factor (Q≈3.4×10⁶) microdisk resonators are demonstrated in a Si3N4 on SiO₂ platform at 652–660 nm with integrated in-plane coupling waveguides. Critical coupling to several radial modes is demonstrated using ...
    • High sensitivity nonchemically amplified molecular resists based on photosensitive dissolution inhibitors 

      Lawson, Richard A.; Tolbert, Laren M.; Henderson, Clifford L. (Georgia Institute of TechnologyAmerican Vacuum Society, 2010-11)
      A new class of nonchemically amplified molecular resists has been made based on the use of photosensitive protecting groups. The deprotection during exposure converts a dissolution inhibiting compound into a dissolution ...
    • High-performance and electrically stable C ₆₀ organic field-effect transistors 

      Domercq, Benoit; Kippelen, Bernard; Zhang, Xiaohong (Georgia Institute of TechnologyAmerican Institute of Physics, 2007-08)
      Electron mobility ranging from 2.7 to 5.0 cm²/V s was achieved when treating the gate dielectric with divinyltetramethyldisiloxane bis(benzocyclobutene) and depositing C ₆₀ at room temperature. The transistors combine ...
    • High-performance C-60 n-channel organic field-effect transistors through optimization of interfaces 

      Kippelen, Bernard; Zhang, Xiaohong (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-11-15)
      High-performance C-60 organic field-effect transistors (OFETs) have been obtained by engineering the essential electrode/semiconductor and dielectric/semiconductor interfaces. By using calcium (Ca) as the source and drain ...
    • High-performance InGaZnO thin-film transistors with high-k amorphous Ba₀.₅Sr₀.TiO₃gate insulator 

      Kim, Jungbae; Fuentes-Hernandez, Canek; Kippelen, Bernard (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-12)
      We report on high-performance n-channel thin-film transistors (TFTs) fabricated using amorphous indium gallium zinc oxide (a-IGZO) and amorphous Ba₀.₅Sr₀.₅TiO₃ (α-BST) as the channel and gate dielectric layers, respectively. ...
    • High-performance photorefractive polymer operating at 1550 nm with near-video-rate response time 

      Tay, Savaş; Thomas, Jayan; Eralp, Muhsin; Li, Guoqiang; Norwood, Robert A.; Schülzgen, Axel; Yamamoto, Michiharu; Barlow, Stephen; Walker, Gregory A.; Marder, Seth R.; Peyghambarian, Nasser (Georgia Institute of TechnologyAmerican Institute of Physics, 2005-10)
      The development of a high-performance photorefractive polymer composite operating at 1550 nm is reported. We show 40% internal diffraction efficiency with response time of 35 ms and a net gain of 20 cm ⁻¹ in four-wave ...
    • High-performance photorefractive polymer operating at 975 nm 

      Eralp, Muhsin; Thomas, Jayan; Tay, Savaş; Li, Guoqiang; Meredith, Gerald; Schülzgen, Axel; Peyghambarian, Nasser; Walker, Gregory A.; Barlow, Stephen; Marder, Seth R. (Georgia Institute of TechnologyAmerican Institute of Physics, 2004-08)
      A family of photorefractive polymer composites has been developed that enable high-performance device operation at a wavelength of 975 nm. This constitutes a major extension into the near-infrared spectral region for the ...
    • High-performance photorefractive polymers sensitized by cadmium selenide nanoparticles 

      Fuentes-Hernandez, Canek; Suh, Duck Jong; Kippelen, Bernard; Marder, Seth R. (Georgia Institute of TechnologyAmerican Institute of Physics, 2004-07)
      We report on efficient and fast hybrid photorefractive polymer sensitized with cadmium selenide (CdSe) quantum dots. The surface of the quantum dots was treated with 4-methylbenzenethiol. This surfactant is responsible for ...
    • High-Q micromechanical resonators in a two-dimensional phononic crystal slab 

      Mohammadi, Saeed; Eftekhar, Ali Asghar; Hunt, William D.; Adibi, Ali (Georgia Institute of TechnologyAmerican Institute of Physics, 2009-02)
      By creating line defects in the structure of a phononic crystal (PC) made by etching a hexagonal array of holes in a 15 μm thick slab of silicon, high-Q PC resonators are fabricated using a complimentary-metal-oxide-semi ...
    • Highly efficient green phosphorescent organic light-emitting diodes with simplified device geometry 

      Haldi, Andreas; Domercq, Benoit; Kippelen, Bernard; Hreha, R. D.; Cho, Jian-Yang; Marder, Seth R. (Georgia Institute of TechnologyAmerican Institute of Physics, 2008-06)
      We report on the performance of green phosphorescent organic light-emitting diodes based on the well-known host 4,4′-di(carbazol-9-yl)-biphenyl and the green phosphor emitter fac tris(2-phenylpyridinato-N,C²′) iridium. ...
    • Highly efficient inverted top-emitting green phosphorescent organic light-lightemitting diodes on glass and flexible substrates 

      Najafabadi, E.; Knauer, K. A.; Haske, Wojciech; Fuentes-Hernandez, Canek; Kippelen, Bernard (Georgia Institute of TechnologyAmerican Institute of Physics, 2012-07)
      Green phosphorescent inverted top-emitting organic light-emitting diodes with high current efficacy and luminance are demonstrated on glass and polyethersulfone (PES) substrates coated with polyethylene dioxythiophene-polystyrene ...
    • Highly specular carbon nanotube absorbers 

      Wang, X. J.; Wang, L. P.; Adewuyi, O. S.; Cola, Baratunde A.; Zhang, Zhuomin (Georgia Institute of TechnologyAmerican Institute of Physics, 2010-10)
      Specular black materials have important applications, such as in absolute cryogenic radiometers, space-borne spectroradiometers, and some energy conversion devices. While vertically aligned carbon nanotubes (VACNT) can ...