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Displaying records 11 to 20 of 24 records.
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11. Low-frequency noise in gallium nitride nanowire mechanical resonators
Topic: Optoelectronics
Published: 12/7/2012
Authors: Jason Gray, Kristine A Bertness, Norman A Sanford, Charles T. Rogers
Abstract: We report on the low-frequency 1/f (flicker) parameter noise displayed by the resonance frequency and resistance of doubly clamped c-axis gallium nitride nanowire (NW) mechanical resonators. The resonators are electrostatically driven and their mech ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909950

12. Microwave near-field probes for photovoltaic applications
Topic: Optoelectronics
Published: 6/19/2011
Author: Joel C. Weber
Abstract: The photoresponse of three different photovoltaic Cu(In, Ga)Se^d2^ (CIGS) samples as well as GaAs and silicon bulk samples is measured using near-field scanning microwave microscopy (NSMM). Modeling predicts light-dependent conductivity values fo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908757

13. Noncontact measurement of charge carrier lifetime and mobility in GaN nanowires
Topic: Optoelectronics
Published: 8/27/2012
Authors: Christopher M. Dodson, Patrick Parkinson, Kristine A Bertness, Hannah J Joyce, Laura M Herz, Norman A Sanford, Michael B Johnston
Abstract: The first noncontact photoconductivity measurements of gallium nitride nanowires (NWs) are presented, revealing a high crystallographic and optoelectronic quality achieved by use of catalyst-free molecular beam epitaxy. In comparison with bulk ma ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911320

14. Optical fiber-coupled cryogenic radiometer with carbon nanotube absorber
Topic: Optoelectronics
Published: 4/1/2012
Authors: David J Livigni, Nathan A Tomlin, Christopher L Cromer, John H Lehman
Abstract: A cryogenic radiometer was constructed for direct-substitution optical fiber power measurements. The cavity is intended to operate at the 3 K temperature stage of a dilution refrigerator or 4.2 K stage of a liquid cryostat. The optical fiber is remov ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909507

15. Optical performance monitoring of (Q)PSK data channels using artificial neural networks trained with parameters derived from delay-tap asynchronous diagrams
Topic: Optoelectronics
Published: 2/15/2011
Authors: Jeffrey A Jargon, Xiaoxia Wu, Alan Willner, Loukas Paraschis
Abstract: We demonstrate a technique of using artificial neural networks trained with parameters derived from delay-tap asynchronous diagrams for optical performance monitoring of phase shift keying (PSK) data signals. We show that asynchronous diagrams from b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906680

16. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905973

17. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902140

18. 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 Timothy 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33133

19. Superconducting transition-edge sensors optimized for high-efficiency photon-number resolving detectors
Topic: Optoelectronics
Published: Date unknown
Authors: Adriana Eleni 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905330

20. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902539



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