Browsing Center for Organic Photonics and Electronics (COPE) by Title
Now showing items 288-307 of 397
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QCM viscometer for bioremediation and microbial activity monitoring
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2003-06)A quartz crystal microbalance has been used to monitor the polymer production of a bacterial population in liquid medium. The increasing amount of produced polymer corresponds to an increase in the viscosity of the ... -
Quadratically convergent algorithm for orbital optimization in the orbital-optimized coupled-cluster doubles method and in orbital-optimized second-order Møller-Plesset perturbation theory
(Georgia Institute of TechnologyAmerican Institute of Physics, 2011-09)Using a Lagrangian-based approach, we present a more elegant derivation of the equations necessary for the variational optimization of the molecular orbitals (MOs) for the coupled-cluster doubles (CCD) method and second-order ... -
Qualitative demonstration of spectral diversity filtering using spherical beam volume holograms
(Georgia Institute of TechnologyOptical Society of America, 2004-06)We investigate the feasibility of designing spectral diversity filters using spherical beam volume holograms. Our experimental results qualitatively show the separation of the information of different incident wavelength ... -
Quantitative modeling of coupling-induced resonance frequency shift in microring resonators
(Georgia Institute of TechnologyOptical Society of America, 2009-12)We present a detailed study on the behavior of coupling-induced resonance frequency shift (CIFS) in dielectric microring resonators. CIFS is related to the phase responses of the coupling region of the resonator coupling ... -
Quantum-chemical investigation of second-order nonlinear optical chromophores: Comparison of strong nitrile-based acceptor end groups and role of auxiliary donors and acceptors
(Georgia Institute of TechnologyAmerican Institute of Physics, 2006-01)We report a detailed quantum-chemical investigation of donor-acceptor substituted dipolar nonlinear optical chromophores incorporating the 4-(dimethylamino)phenyl donor end group and a variety of strong heterocyclic acceptor ... -
Quantum-well infrared photodetector structure synthesis: Methodology and experimental verification
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2003-03) -
Quasi 2-D Field Reconstruction Using the Conjoint Cylindrical Wave Expansion
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-04)Off-the-horizon propagation severely degrades the accuracy of any field reconstruction technique that presupposes a two-dimensional (2-D) wireless channel. Therefore, employing the 2-D cylindrical wave expansion (CWE) ... -
Quasi-free-space optical coupling between diffraction grating couplers fabricated on independent substrates
(Georgia Institute of TechnologyOptical Society of America, 2004-10)Optical coupling between preferential-order volume diffraction grating couplers fabricated on independent substrates is demonstrated. The coupling efficiency between gratings is quantified as a function of both grating and ... -
Radial elasticity of multiwalled carbon nanotubes
(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
(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
(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
(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
(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
(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. ... -
Recent Progress in Organic Solar Cells: From a Lab Curiosity to a Serious Photovoltaic Technology
(Georgia Institute of Technology, 2014-02-07)Carbon-based organic semiconductors have many potential advantages like easy large-area preparation on flexible substrates, large variety of materials, and low cost. Although known for a century, organics have achieved ... -
Refractive-index profiling of azimuthally asymmetric optical fibers by microinterferometric optical phase tomography
(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 ... -
Relation of Structure and Charge Transport in 'Single-Stack' Organic Nanowires
(Georgia Institute of Technology, 2013-08-28)Organic nanowires may provide insights into the fundamental processes of charge generation and transport in organic semiconductors under nanoscopic confinement. Here, we demonstrate how a simple molecular design results ... -
Remote doping of a pentacene transistor: Control of charge transfer by molecular-level engineering
(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
(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
(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 ...