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1. Characterizing a Noninsertable Directional Device Using the NIST Uncertainty Framework
Topic: Optoelectronics
Published: 6/6/2014
Authors: Jeffrey A Jargon, Dylan F Williams, Paul D Hale, Michael D Janezic
Abstract: We characterize and provide uncertainties for a noninsertable, directional device over a frequency range of 90 to 100 GHz using the NIST Microwave Uncertainty Framework in conjunction with a commercial vector network analyzer. Our device consists of ...

2. Gallium Nitride Nanowires for On-Chip Optical Interconnects on Ex-Situ Substrates
Topic: Optoelectronics
Published: 1/16/2013
Authors: Matthew David Brubaker, Paul Timothy Blanchard, John B Schlager, Aric Warner Sanders, Alexana Roshko, Shannon Marie Madison Duff, Jason Gray, Victor M. Bright, Norman A Sanford, Kristine A Bertness
Abstract: In this letter we report on the fabrication, device characteristics, and optical coupling of a two-nanowire device comprising light-emitting diode and photoconductive GaN nanowires. Axial p-n junction GaN nanowires were grown by molecular beam epita ...

3. 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 ...

4. 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 ...

5. 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 ...

6. 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.

7. 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- ...

8. 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 ...

9. 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 ...

10. 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 ...

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