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You searched on: Topic Area: Optoelectronics Sorted by: date

Displaying records 11 to 20 of 31 records.
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11. 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 ...

12. 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 ...

13. Frequency Characterization of an External-Cavity Quantum Cascade Laser at 4.5 {mu}m using a Frequency Comb
Topic: Optoelectronics
Published: 1/25/2012
Authors: Kevin O. (Kevin) Knabe, Paul A Williams, Fabrizio Raphael Giorgetta, Chris Armacost, Michael Radunsky, Nathan Reynolds Newbury
Abstract: We measure the frequency noise spectrum of a free-running external-cavity quantum cascade laser at 4.5 {mu}m through sum frequency generation with a fiber frequency comb.

14. High-Accuracy Photoreceiver Frequency Response Measurements at 1.55 um by Use of a Heterodyne Phase-Locked Loop
Topic: Optoelectronics
Published: 9/29/2011
Authors: Tasshi Dennis, Paul D Hale
Abstract: We demonstrate a high-accuracy heterodyne measurement system for characterizing the magnitude of the frequency response of high-speed 1.55 µm photoreceivers from 2 MHz to greater than 50 GHz. At measurement frequencies below 2 GHz, we employ a phase- ...

15. Enhanced coupling between light and surface plasmons by nanostructured Fabry-Pérot resonator
Topic: Optoelectronics
Published: 9/26/2011
Authors: Brian S. Dennis, Vladimir A Aksyuk, Michael Haftel, Stefan T. Koev, Girsh Blumberg
Abstract: It is recognized that surface plasmons (SPs),which can be present on particulate, smooth, or corrugated metallic surfaces, have enormous potential in the fields of novel nano-optical and opto-electronic devices, as well as in spectroscopic, biologic ...

16. 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 ...

17. A general approach to low noise readout of terahertz imaging arrays
Topic: Optoelectronics
Published: 6/16/2011
Authors: Erich N Grossman, Jonathan D Chisum, Zoya Popovic
Abstract: This article describes the theory and design of an ultra-low noise electronic readout circuit for use with room temperature video-rate terahertz imaging arrays. First, the noise characteristics of various imaging detectors, including low resistan ...

18. 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 ...

19. 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 ...

20. 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 ...

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