Browsing Center for Organic Photonics and Electronics (COPE) by Title
Now showing items 242-261 of 397
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Object localization in the presence of a strong heterogeneous background in fluorescent tomography
(Georgia Institute of TechnologyOptical Society of America, 2008-06)We propose a method for object localization in fluorescent tomography (FT) in the presence of a highly heterogeneous background. Existing approaches typically assume a homogeneous background distribution; thus, they are ... -
Observation of large parity-change-induced dispersion in triangular-lattice photonic crystal waveguides using phase sensitive techniques
(Georgia Institute of TechnologyAmerican Institute of Physics, 2006-02)We experimentally studied W1 triangular-lattice photonic crystal waveguides (PCWs) fabricated on semiconductor-on-insulator substrates using phase-sensitive lock-in techniques. In addition to the improved signal-to-noise ... -
On chip complex signal processing devices using coupled phononic crystal slab resonators and waveguides
(Georgia Institute of TechnologyAmerican Institute of Physics, 2012-03)In this paper, we report the evidence for the possibility of achieving complex signal processing functionalities such as multiplexing/demultiplexing at high frequencies using phononic crystal (PnC) slabs. It is shown that ... -
On the accuracy limits of orbital expansion methods: Explicit effects of k-functions on atomic and molecular energies
(Georgia Institute of TechnologyAmerican Institute of Physics, 2003-05)For selected first- and second-row atoms, correlation-optimized Gaussian k functions have been determined and used in the construction of septuple-ζ basis sets for the correlation-consistent cc-pVXZ and aug-cc-pVXZ series. ... -
On the polarization of the green emission of polyfluorenes
(Georgia Institute of TechnologyAmerican Institute of Physics, 2003-10)An experimental and theoretical study of the anisotropic optical properties of polyfluorenes (PFs) bearing ketonic defects is presented. Polarized emission experiments performed on photooxidized aligned PF layers indicate ... -
Ontology of temperature in nonequilibrium systems
(Georgia Institute of TechnologyAmerican Institute of Physics, 2007-06)The laws of thermodynamics provide a clear concept of the temperature for an equilibrium system in the continuum limit. Meanwhile, the equipartition theorem allows one to make a connection between the ensemble average of ... -
Optical and electrical interconnect partition length based on chip-to-chip bandwidth maximization
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2004-04)The lengths beyond which board-level optical waveguides are capable of transferring a larger number of bits per second than electrical interconnects are found for various technology generations. As technology scales ... -
Optical correlation using gated localized holography
(Georgia Institute of TechnologySociety of Photo-optical Instrumentation Engineers (SPIE), 2005-08)We present a new technique for optical correlation using gated holographic recording by which the holograms are localized in separate slices along the recording medium. We compare the performance of localized holographic ... -
Optical properties of singly charged conjugated oligomers: A coupled-cluster equation of motion study
(Georgia Institute of TechnologyAmerican Institute of Physics, 2004-09)We have implemented a coupled-cluster equation of motion approach combined with the intermediate neglect of differential overlap parametrization and applied it to study the excited states and optical absorptions in positively ... -
Optical single-angle plane-wave transmittances/reflectances from Schwarzschild objective variable-angle measurements
(Georgia Institute of TechnologyAmerican Institute of Physics, 2004-02)Photonic crystal structures and other nanoscale and microscale optical structures are centrally important to future device technology. The fundamental infrared single-angle plane-wave experimental characterization of these ... -
Optical transmission of polymer pillars for chip I/O optical interconnections
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2004-01)In the pursuit of high-density wafer-level input–output optical interconnections, microscopic polymer pillars have recently been fabricated. The optical performance of these pillars is critical for their potential ... -
Optical-fiber-to-waveguide coupling using carbon-dioxide-laser-induced long-period fiber gratings
(Georgia Institute of TechnologyOptical Society of America, 2005-08)Optical fibers are expected to play a role in chip-level and board-level optical interconnects because of limitations on the bandwidth and level of integration of electrical interconnects. Therefore, methods are needed to ... -
Optics in Energy: the power of optical solutions
(Georgia Institute of TechnologyOptical Society of America, 2010-04) -
Optimal sliding correlator channel sounder design
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2008-09)The sliding correlator technique remains one of the most versatile and effective methods for sounding the radio propagation channel in next-generation wireless systems. Despite their utility, there has never been a ... -
Optimal sparse solution for fluorescent diffuse optical tomography: theory and phantom experimental results
(Georgia Institute of TechnologyOptical Society of America, 2007-04)We present a method to accurately localize small fluorescent objects within the tissue using fluorescent diffuse optical tomography (FDOT). The proposed method exploits the localized or sparse nature of the fluorophores ... -
Optimization of anisotropically etched silicon surface-relief gratings for substrate-mode optical interconnects
(Georgia Institute of TechnologyOptical Society of America, 2006-01)The optimum profiles of right-angle-face anisotropically etched silicon surface-relief gratings illuminated at normal incidence for substrate-mode optical interconnects are determined for TE, TM, and random linear (RL) ... -
Optimization of finite-length input volume holographic grating couplers illuminated by finite-width incident beams
(Georgia Institute of TechnologyOptical Society of America, 2005-07)A finite volume holographic grating coupler (VHGC) normally illuminated with various incident-beam profiles (such as a Gaussian beam, a flat cosine-squared beam, and an exponential-decay beam) with finite beam widths for ... -
Optimization of sawtooth surface-relief gratings: effects of substrate refractive index and polarization
(Georgia Institute of TechnologyOptical Society of America, 2006-05)The effect of the refractive index of the substrate together with the incident polarization on the optimization of sawtooth surface-relief gratings (SRGs) is investigated. The global optimum diffraction efficiencies of the ... -
Optimizing organic photovoltaics using tailored heterojunctions: A photoinduced absorption study of oligothiophenes with low band gaps
(Georgia Institute of TechnologyAmerican Physical Society, 2008-02)A power conversion efficiency of 3.4% with an open-circuit voltage of 1 V was recently demonstrated in a thin film solar cell utilizing fullerene C60 as acceptor and a new acceptor-substituted oligothiophene with an optical ... -
Optimum parallel-face slanted surface-relief gratings
(Georgia Institute of TechnologyOptical Society of America, 2007-06)Using a combination of rigorous coupled-wave analysis and simulated annealing, parallel-face slanted surface-relief gratings (PFSSRGs) are optimized. For substrate-mode optical interconnects, profiles are presented for ...