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You searched on: Topic Area: Optical Physics Sorted by: date

Displaying records 41 to 50 of 55 records.
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41. Electron Vortex Beams with High Quanta of Orbital Angular Momentum
Topic: Optical Physics
Published: 1/14/2011
Authors: Benjamin James McMorran, Amit Kumar Agrawal, Ian M. Anderson, Andrew A Herzing, Henri J Lezec, Jabez J McClelland, John Unguris
Abstract: Analogous to vortices in light optical beams, electron optical beams with helical wavefronts carry orbital angular momentum and promise new capabilities for electron microscopy and other applications. We use nanofabricated diffraction holograms in an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906991

42. Synthetic Electric and Magnetic Fields for Ultracold Neutral Atoms
Topic: Optical Physics
Published: 1/1/2011
Authors: William D Phillips, Yu-Ju Lin, Robert L. Compton, Karina K. Jimenez Garcia, Abigail Reiko Perry, James V Porto, Ian B Spielman
Abstract: We use Raman coupling between magnetic sublevels of a 87Rb Bose-Einstein condensate (BEC) to create an effective vector gauge field for the neutral atoms. They behave as if they were charged particles in a magnetic vector potential. With appropriate ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907486

43. Efficient fiber optic detection of trapped ion flourescence
Topic: Optical Physics
Published: 7/9/2010
Authors: Aaron Vandevender, Yves Colombe, Jason Amini, Dietrich G Leibfried, David J Wineland
Abstract: Integration of fiber optics may play a critical role in the development of quantum information processors based on trapped ions, atoms, and quantum dots. Fibers could help enable a scalable and efficient means of collecting light from and deliverin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905197

44. Femtosecond frequency comb measurement of absolute frequencies and hyperfine coupling constants in cesium vapor
Topic: Optical Physics
Published: 4/29/2010
Authors: Jason Stalnaker, Vela Mbele, Vladislav Gerginov, Tara Michele Fortier, Scott A Diddams, Leo Hollberg, C E Tanner
Abstract: We report measurements of absolute transition frequencies and hyperfine coupling constants for the 8S1/2 , 9S1/2 , 7D3/2 , and 7D5/2 states in 133 Cs vapor. The stepwise excitation through either the 6P1/2 or 6P3/2 intermediate state is perform ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904617

45. Sensitivity Comparison of Mx and Frequency Modulated Bell-Bloom Cs Magnetometers in a Micro-Fabricated Cell
Topic: Optical Physics
Published: 2/1/2010
Authors: Ricardo Jimenez Martinez, William C. Griffith, Ying-ju Wang, Svenja A Knappe, John E Kitching, Ken Smith, Mark Prouty
Abstract: We compare the sensitivity performance of two optically pumped atomic magnetometers based on the Mx and frequency-modulated Bell-Bloom configurations. The Cs magnetometers are implemented using a millimeter-scale microfabricated vapor cell in a confi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842606

46. Progress Toward Corrugated Feed Horn Arrays in Silicon
Topic: Optical Physics
Published: 12/16/2009
Authors: Joseph Wright Britton, Ki W. Yoon, James A Beall, Daniel Thomas Becker, Hsiao-Mei Cho, Gene C Hilton, Michael D. Niemack, Kent D. Irwin
Abstract: We are developing monolithic arrays of corrugated feed horns fabricated in silicon for dual-polarization single mode operation at 90, 145 and 220 GHz. The arrays consist of hundreds of platelet feed horns assembled from gold coated stacks of micromac ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903191

47. Quasi-phasematched Second Harmonic Generation in GaAs Microdisks
Topic: Optical Physics
Published: 11/15/2009
Authors: Paulina S Kuo, W Fang, Glenn Scott Solomon
Abstract: We discuss design and tuning of second-harmonic generation in GaAs microdisks. Quasi-phasematching can be achieved in the microdisk geometry without external domain inversions, but efficient nonlinear optical mixing requires that all waves be resonan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903181

48. Uncooled, Millimeter-Scale Atomic Magnetometers with Femtotesla Sensitivity
Topic: Optical Physics
Published: 10/26/2009
Authors: John E Kitching, Svenja A Knappe, William C. Griffith, Jan Preusser, V Gerginov, Peter D. Schwindt, Vishal Shah, Ricardo Jimenez Martinez
Abstract: We summarize recent results at NIST to develop high-performance yet highly miniaturized magnetic sensors based on atomic vapors confined in microfabricated alkali vapor cells. These sensors currently achieve sensitivities in the range of a few tens o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903176

49. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Optical Physics
Published: 8/6/2009
Authors: Hongki Min, Allan H. MacDonald
Abstract: We predict that the optical conductivity of normal graphene multilayers is close to {sigma}^duni^=({pi}/2) e^u2^/h per layer over a broad range of frequencies. The origin of this behavior is an emergent chiral symmetry which is present in normal N-l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902107

50. Supercontinuum Sources for Metrology
Topic: Optical Physics
Published: 6/2/2009
Authors: John Taylor Woodward IV, Allan W. Smith, Colleen Alana Jenkins, Chungsan Lin, Steven W Brown, Keith R. Lykke
Abstract: Supercontinuum (SC) sources are novel laser-based sources that generate a broad, white-light continuum in single mode photonic crystal fibers. Currently, up to 6 W of optical power is available, spanning the spectral range from 460 nm to 2500 nm. A ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900202



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