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Topic Area: Physics

Displaying records 31 to 40 of 762 records.
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31. Preparation of nanocomposite plasmonic films made from cellulose nanocrystals or mesoporous silica decorated with unidirectionally aligned gold nanorods
Topic: Physics
Published: 4/11/2014
Authors: Michael Campbell, Qingkun Liu, Aric Warner Sanders, Julian Evans, Ivan I. Smalyukh
Abstract: Using liquid crystalline self-assembly of cellulose nanocrystals, we achieve long-range alignment of anisotropic metal nanoparticles in colloidal nanocrystal dispersions that are then used to deposit thin structured films with ordering features h ...

32. The hyperfine Paschen-Back Faraday effect
Topic: Physics
Published: 3/26/2014
Authors: Svenja A Knappe, M.A. Zentile, Rebecca Andrews, L. Weller, C.S. Adams, I.G. Hughes
Abstract: We investigate experimentally and theoretically the Faraday effect in an atomic medium in the hyperfine Paschen-Back regime, where the Zeeman interaction is larger than the hyperfine splitting. We use a small permanent magnet and a micro-fabricated ...

33. Dual-polarization-sensitive kinetic inductance detectors for balloon-borne, sub-millimeter polarimetry
Topic: Physics
Published: 3/20/2014
Authors: James A Beall, Daniel T Becker, Justus A Brevik, Hsiao-Mei Cho, Gene C Hilton, Kent D Irwin, Dale Li, David P Pappas, Jeffrey Lee Van Lanen, Johannes Hubmayr
Abstract: We are developing arrays of kinetic inductance detectors for sub-millimeter polarimetry that will be deployed on the BLAST balloon-borne instrument. The array is feedhorn-coupled, and each pixel contains two lumped-element kinetic inductance dete ...

34. Optical amplification and pulse interleaving for low noise photonics microwave generation
Topic: Physics
Published: 3/12/2014
Authors: Franklyn J Quinlan, Frederick Nicholas Baynes, Tara Michele Fortier, Qiugui Zhou, Allen Cross, Joe Campbelll, Scott A Diddams
Abstract: We investigate the impact of pulse interleaving and optical amplification on the spectral purity of microwave signals generated by photodetecting the pulsed output of an Er:fiber-based optical frequency comb. It is shown that the microwave phase nois ...

35. WWVB: A Half Century of Delivering Accurate Frequency and Time by Radio
Series: Journal of Research (NIST JRES)
Report Number: 119.004
Topic: Physics
Published: 3/12/2014
Authors: Michael A Lombardi, Glenn K Nelson
Abstract: In commemoration of its 50th anniversary of broadcasting from Fort Collins, Colorado, this paper provides a history of National Institute of Standards and Technology (NIST) radio station WWVB. The narrative describes the evolution of the station ...

36. Spin dephasing as a probe of Mmde temperature, motional state distributions, and heating rates in a two-dimensional ion crystal
Topic: Physics
Published: 3/10/2014
Authors: Brian C Sawyer, Joseph Wright Britton, John J Bollinger
Abstract: We employ spin-dependent optical dipole forces to characterize the transverse center-of-mass (COM) motional mode of a two-dimensional trapped ion crystal of hundreds of ^u9^Be^u+^. By comparing the measured spin dephasing produced by the spin-depende ...

37. A collapse of the cross-spectral function in phase noise metrology
Topic: Physics
Published: 2/25/2014
Authors: Craig W Nelson, Archita Hati, David Allan Howe
Abstract: Cross-spectral analysis is a mathematical tool for extracting the power spectral density of a correlated signal from two time series in the presence of uncorrelated interfering signals. We demonstrate and explain a set of conditions where the detect ...

38. Hyperfine structure in 229g-Th^u3+^ as a probe of the 229g-Th -> 229m-Th nuclear excitation energy
Topic: Physics
Published: 2/14/2014
Author: Kyle P Beloy
Abstract: We identify a potential means to extract the 229g-Th -> 229m-Th nuclear excitation energy from precision microwave spectroscopy of the 5F^d5/2,7/2^ hyperfine manifolds in the ion 229g-Th^u3+^. The hyperfine interaction mixes this ground fine structur ...

39. Supercontinuum generation in an on-chip silica waveguide
Topic: Physics
Published: 2/13/2014
Authors: Scott A Diddams, Dong Yoon Oh, David Sell, Hansuek Lee, Ki Youl Yang, Kerry J. Vahala
Abstract: Supercontinuum generation is demonstrated in an on-chip silica spiral waveguide by launching 180-fs pulses from an optical parametric oscillator at the center wavelength 1330 nm. With a coupled pulse energy of 2.17 nJ, the broadest spectrum in the fu ...

40. High-accuracy measurement of the black-body radiation frequency shift of the ground-state hyperfine transition in ^u133^Cs
Topic: Physics
Published: 2/7/2014
Authors: Steven R Jefferts, Thomas Patrick Heavner, Thomas Edward Parker, Jon Hardy Shirley, Elizabeth A Donley, Neil Ashby
Abstract: We report a high-accuracy direct measurement of the blackbody radiation shift (BBR) of ^u133^Cs ground state hyperfine transition. This frequency shift is one of the largest systematic frequency biases encountered in realizing the current definition ...

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