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Displaying records 21 to 30 of 32 records.
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21. Passive terahertz camera for standoff security screening
Topic: Optoelectronics
Published: 7/1/2010
Authors: Erich N Grossman, Charles Dietlein
Abstract: We describe the construction and performance of a passive, real-time terahertz camera based on a modular, 64-element linear array of cryogenic hotspot microbolometers. A reflective conical scanner sweeps out a 2 m ×4 m(vertical × horizontal) field of ...

22. Dark pulse quantum dot diode laser
Topic: Optoelectronics
Published: 6/7/2010
Authors: Mingming M. Feng, Kevin Lawrence Silverman, Richard P Mirin, Steven T. (Steven T.) Cundiff
Abstract: We describe an operating regime for passively mode-locked quantum dot diode laser where the output consists of a train of dark pulses, i.e., intensity dips on a continuous background. We show that a dark pulse train is a solution to the master equati ...

23. Waveform metrology and a quantitative study of regularized deconvolution
Topic: Optoelectronics
Published: 5/1/2010
Authors: Paul D Hale, Andrew M Dienstfrey
Abstract: We present methodology and preliminary results of a Monte-Carlo simulation to perform a quantified analysis of regularized deconvolution in the context of full waveform metrology. We analyze the behavior of different regularized inversion methods wi ...

24. Superconducting transition-edge sensors optimized for high-efficiency photon-number resolving detectors
Topic: Optoelectronics
Published: 4/27/2010
Authors: Adriana E Lita, Brice R. Calkins, Lenson Pellouchoud, Aaron J Miller, Sae Woo Nam
Abstract: Superconducting photon detectors have emerged as a powerful new option for detecting single photons. System detection efficiency that incorporates the quantum efficiency of the device and system losses is one of the most important single-photon detec ...

25. Tensile measurement of single crystal gallium nitride nanowires on MEMS test stages
Topic: Optoelectronics
Published: 4/18/2010
Authors: J. J. Brown, A. I. Baca, Kristine A Bertness, D. A. Dikin, R. S. Ruoff, Victor M. Bright
Abstract: This paper reports the first direct tensile tests on nearly defect free, n-type (Si-doped) gallium nitride single crystal nanowires. Here, for the first time, nanowires have been integrated with actuated, active microelectromechanical (MEMS) structur ...

26. Steady-state and transient photoconductivity in c-axis GaN nanowires grown by nitrogen-plasma-assisted molecular beam epitaxy
Topic: Optoelectronics
Published: 2/12/2010
Authors: Norman A Sanford, Paul T Blanchard, Kristine A Bertness, Lorelle Mansfield, John B. Schlager, Aric Warner Sanders, Alexana Roshko, Beau Burton, Steven George
Abstract: Analysis of steady-state and transient photoconductivity measurements at room temperature performed on c-axis oriented GaN nanowires yielded estimates of free carrier concentration, drift, mobility, surface band bending, and surface capture coefficie ...

27. Relative Photon-to-Carrier Efficiencies of Alternating Nanolayers of Zinc Phthalocyanine and C60 Multilayer Films Assessed by Time-Resolved Terahertz Spectroscopy
Topic: Optoelectronics
Published: 10/1/2009
Authors: Okan Esenturk, Joseph S Melinger, Paul A. Lane, Edwin J Heilweil
Abstract: Alternating multi-layer and 1:1 blended films of zinc phthalocyanine (ZnPc)and buckminsterfullerene (C60) were investigated as model active layers for solar cells by Time-Resolved Terahertz Spectroscopy (TRTS). Relative photon-to-carrier efficiencies ...

28. Full PMD vector measured directly from modulated data using linear optical sampling
Topic: Optoelectronics
Published: 7/15/2009
Authors: Paul A Williams, Tasshi Dennis
Abstract: We demonstrate a new technique to monitor the polarization-mode dispersion in a fiber communication channel by analyzing the modulated data at the fiber output measured with Polarization-Sensitive Linear Optical Sampling (PS-LOS).

29. EEEL Technical Accomplishments
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7568
Topic: Optoelectronics
Published: 3/30/2009
Author: Erik M Secula
Abstract: This document describes the technical work of the Electronics and Electrical Engineering Laboratory. In this report, you will find that EEEL researchers are developing the world's most advanced sensors, providing advanced gamma ray imagers for astro ...

30. Absorption, transmission, and scattering of expanded polystyrene at millimeter-wave and terahertz frequencies
Topic: Optoelectronics
Published: 3/17/2008
Authors: Charles Dietlein, Jon E. Bjarnason, Erich N Grossman, Zoya Popovic
Abstract: Conventional material measurements of transmission and reflection in the millimeter-wave and terahertz frequency range do not differentiate between scattering and absorption, grouping effects from both mechanisms together into 'loss'. Accurate knowle ...

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