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Topic Area: Optoelectronics
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Displaying records 11 to 20 of 63 records.
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11. Catalyst-free GaN nanowire growth and optoelectronic characterization
Topic: Optoelectronics
Published: 8/19/2011
Authors: Kristine A Bertness, Norman A Sanford, John B Schlager
Abstract: We discuss the present state-of-the-art concerning the growth mechanism, optical luminescence and electrical properties for GaN nanowires grown with catalyst-free molecular beam epitaxy. These nanowires are essentially defect-free and display long p ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906115

12. Gallium nitride nanowire electromechanical resonators with piezoresistive readout
Topic: Optoelectronics
Published: 8/11/2011
Authors: Kristine A Bertness, Jason M. Gray, Norman A Sanford, Charles T. Rogers
Abstract: We report on the fabrication, piezoresistive readout, and frequency response of doubly-clamped c-axis gallium nitride (GaN) nanowire (NW) resonators that show mechanical quality factors exceeding 10,000. The devices are fabricated using a combination ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907884

13. Comparison of absolute measurements of laser power using next generation NIST high power radiometer and Air Force high power calorimeter
Topic: Optoelectronics
Published: 6/8/2011
Authors: Marla L Dowell, Christopher L Cromer, Xiaoyu X. Li, John Bagford, Dan Seibert, John Eric, David Cooper, Steven Comisford, Ernie Cromwell, Richard Bowling
Abstract: We report comparisons of laser power measurements between the new NIST radiometer, also known as the BB Prime, and the current Air Force standards, known as the BB calorimeter. [1] These measurements were performed using high power laser sources in t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908402

14. The effect of growth orientation and diameter on the elasticity of GaN Nanowires - a combined insitu TEM and atomistic modeling investigation
Topic: Optoelectronics
Published: 12/20/2010
Authors: Kristine A Bertness, Norman A Sanford, Albert Davydov
Abstract: We characterized the elastic properties of GaN nanowires grown along different crystallographic orientations. In situ transmission electron microscopy tensile tests were conducted using a MEMS-based nanoscale testing system. Complementary atomistic s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906878

15. Spectroscopy with a coherent dual frequency comb interferometer at 3.4 µm
Topic: Optoelectronics
Published: 8/1/2010
Authors: Esther Baumann, Fabrizio Raphael Giorgetta, Ian R Coddington, William C Swann, Nathan Reynolds Newbury
Abstract: A coherent dual fiber-comb spectrometer centered at 1.5 µm wavelengths is transferred to 3.4 µm by difference-frequency generation with a 1064 nm cw laser. It is shown that the residual linewidth between the comb teeth at 3.4 µm is resolution-limited ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905917

16. Analysis of trace impurities in semiconductor gas via cavity-enhanced direct frequency comb spectroscopy
Topic: Optoelectronics
Published: 7/20/2010
Authors: Kristine A Bertness, Kevin C Cossel, F Adler, M J Thorpe, Jun Ye
Abstract: Cavity-enhanced direct frequency comb spectroscopy (CE-DFCS) has demonstrated powerful potential for trace-gas detection based on its unique combination of high bandwidth, rapid data acquisition, high sensitivity, and high resolution, which is unava ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908253

17. Calibration service for instruments that measure laser beam diameter
Series: Special Publication (NIST SP)
Report Number: 250-87
Topic: Optoelectronics
Published: 7/1/2010
Author: Shao Yang
Abstract: This document describes the calibration service for instruments that measure laser beam diameter. An overview of the measurement procedures, measurement system, and uncertainty analysis is presented. A sample measurement report is included in this do ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903067

18. 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

19. Dark pulse quantum dot diode laser
Topic: Optoelectronics
Published: 6/7/2010
Authors: Mingming Feng, Kevin Lawrence Silverman, Richard P Mirin, 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907918

20. Dual-rate linear optical sampling for remote monitoring of complex modulation formats
Topic: Optoelectronics
Published: 6/2/2010
Authors: Tasshi Dennis, Paul A Williams
Abstract: We demonstrate linear optical sampling using simultaneous pulsed and CW local oscillators to enable phase tracking of a data modulated carrier. The technique enables the direct measurement of remotely received signals with low phase noise.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904987



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