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Topic Area: Optoelectronics
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Displaying records 51 to 60 of 70 records.
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51. Quantum dot single photon sources studied with superconducting single photon detectors
Topic: Optoelectronics
Published: 11/1/2006
Authors: Martin J Stevens, Robert Hadfield, Robert E Schwall, Sae Woo Nam, Richard P Mirin
Abstract: We report the observation of photon antibunching from a single, self-assembled InGaAs quantum dot (QD) at temperatures up to 135 K. The second-order intensity correlation, g(2)(0), is less than 0.260 {+ or -} 0.024 for temperatures up to 100 K. At 12 ...

52. Reflective optical chopper used in NIST high-power laser measurements
Series: Journal of Research (NIST JRES)
Topic: Optoelectronics
Published: 11/1/2008
Authors: Xiaoyu X. Li, Thomas Scott, Christopher L Cromer, Joshua Aram Hadler
Abstract: For the past ten years, NIST has used high-reflectivity, optical choppers as beamsplitters and attenuators when calibrating the absolute responsivity and response linearity of detectors used with high-power CW lasers. The chopper-based technique has ...

53. Relative Photon-to-Carrier Efficiencies of Alternating Nanolayers of Zinc Phthalocyanine and C60 Multilayer Films Assessed by Time-Resolved Terahertz Spectroscopy
Topic: Optoelectronics
Published: 10/1/2009
Authors: Okan Esenturk, Joseph S Melinger, Paul A. Lane, Edwin J Heilweil
Abstract: Alternating multi-layer and 1:1 blended films of zinc phthalocyanine (ZnPc)and buckminsterfullerene (C60) were investigated as model active layers for solar cells by Time-Resolved Terahertz Spectroscopy (TRTS). Relative photon-to-carrier efficiencies ...

54. Round-robin testing of carbon nanotubes using Novel and traditional nanometrology tools
Topic: Optoelectronics
Published: 8/26/2007
Authors: John H Lehman, Tom Campbell, Anne Dillon, Roop Mahajan
Abstract: Quantitative, systematic and reproducible metrology of carbon nanotubes is paramount to the fundamental understanding of these promising nanomaterials. Moreover, development of novel techniques which extend the current arsenal of nanotools is also de ...

55. 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 ...

56. 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 ...

57. Steady-state and transient photoconductivity in c-axis GaN nanowires grown by nitrogen-plasma-assisted molecular beam epitaxy
Topic: Optoelectronics
Published: 2/12/2010
Authors: Norman A Sanford, Paul Timothy Blanchard, Kristine A Bertness, Lorelle Mansfield, John B Schlager, Aric Warner Sanders, Alexana Roshko, Beau Burton, Steven George
Abstract: Analysis of steady-state and transient photoconductivity measurements at room temperature performed on c-axis oriented GaN nanowires yielded estimates of free carrier concentration, drift, mobility, surface band bending, and surface capture coefficie ...

58. Superconducting transition-edge sensors optimized for high-efficiency photon-number resolving detectors
Topic: Optoelectronics
Published: Date unknown
Authors: Adriana Eleni Lita, Brice R. Calkins, Lenson Pellouchoud, Aaron J Miller, Sae Woo Nam
Abstract: Superconducting photon detectors have emerged as a powerful new option for detecting single photons. System detection efficiency that incorporates the quantum efficiency of the device and system losses is one of the most important single-photon detec ...

59. Synchronization monitoring of I/Q data and pulse carving misalignment for a serial-type 80-Gb/s RZ-DQPSK transmitter through optical/RF clock tone measurement
Topic: Optoelectronics
Published: 8/4/2008
Authors: Jeffrey A Jargon, Xiaoxia Wu, Louis Christen, Scott Nuccio, Omer F. Yilmaz, Loukas Paraschis, Yannick K. Lize, Alan Willner
Abstract: We experimentally demonstrate a monitoring technique for determining misalignment between the in-phase/ quadrature (I/Q) data streams and between the data and pulse carving in an 80 Gb/s serial-type return-to-zero differential quadrature phase-shift- ...

60. Tensile measurement of single crystal gallium nitride nanowires on MEMS test stages
Topic: Optoelectronics
Published: 4/18/2010
Authors: J. J. Brown, A. I. Baca, Kristine A Bertness, D. A. Dikin, R. S. Ruoff, Victor M. Bright
Abstract: This paper reports the first direct tensile tests on nearly defect free, n-type (Si-doped) gallium nitride single crystal nanowires. Here, for the first time, nanowires have been integrated with actuated, active microelectromechanical (MEMS) structur ...

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