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Topic Area: Optoelectronics
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Displaying records 11 to 20 of 70 records.
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11. 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- ...

12. 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 ...

13. Terahertz metrology and instrumentation
Topic: Optoelectronics
Published: 8/29/2011
Authors: Erich N Grossman, Zoya Popovic
Abstract: This paper gives an overview of measurement techniques used in the THz region of the electromagnetic spectrum, from about 100 GHz to several THz. Currently available components necessary for THz metrology, such as sources, detectors and passives, ...

14. 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 ...

15. 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 ...

16. Microwave near-field probes for photovoltaic applications
Topic: Optoelectronics
Published: 6/19/2011
Author: Joel Calvin 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. 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 ...

19. Spatial dependence of output pulse delay in a niobium nitride nanowire superconducting single-photon detector
Topic: Optoelectronics
Published: 5/16/2011
Authors: Sae Woo Nam, J. A. O'Connor, Michael Tanner, C. M. Natarajan, G. S. Buller, R. J. Warburton, S Miki, Z. Wang, Robert Hadfield
Abstract: We report on the position-dependent variation in output pulse timing across a superconducting single- photon detector. Our device consists of a single niobium nitride nanowire meander (100 nm width, 4 nm film thickness, 2 mm length). We use a conf ...

20. Dual-wavelength transfer standard for laser peak-power measurement
Topic: Optoelectronics
Published: 5/9/2011
Authors: Rodney W Leonhardt, Daniel King
Abstract: The National Institute of Standards and Technology (NIST) and the Naval Surface Warfare Center ‹ Corona Division (NSWC) have jointly developed a low-level peak-power radiometer (D-ESR) which functions as a transfer standard for measuring laser pu ...

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