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Topic Area: Optoelectronics

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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.

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Looking for a NIST Special Publication (NIST SP Series)? Place the series number and dash in the report number field (Example: 800-) and begin your search.

  • SP 250-XX: Calibration Services
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