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27 Sep 2010

Volume 97, Issue 13, Articles (13xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 97, 133303 (2010); http://dx.doi.org/10.1063/1.3491815 (3 pages)

Yoshihide Fujisaki, Yoshiki Nakajima, Daisuke Kumaki, Toshihiro Yamamoto, Shizuo Tokito, Takahiro Kono, Jun-ichi Nishida, and Yoshiro Yamashita
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Independent individual addressing of multiple neutral atom qubits with a micromirror-based beam steering system

C. Knoernschild, X. L. Zhang, L. Isenhower, A. T. Gill, F. P. Lu, M. Saffman, and J. Kim

Appl. Phys. Lett. 97, 134101 (2010); http://dx.doi.org/10.1063/1.3494526 (3 pages) | Cited 4 times

Online Publication Date: 28 September 2010

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We demonstrate a scalable approach to addressing multiple atomic qubits for use in quantum information processing. Individually trapped 87Rb atoms in a linear array are selectively manipulated with a single laser guided by a microelectromechanical beam steering system. Single qubit oscillations are shown on multiple sites at frequencies of ≃ 3.5 MHz with negligible crosstalk to neighboring sites. Switching times between the central atom and its closest neighbor were measured to be 6–7 μs while moving between the central atom and an atom two trap sites away took 10–14 μs.
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03.67.Lx Quantum computation architectures and implementations
37.10.Gh Atom traps and guides
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Coupling electron-hole and electron-ion plasmas: Realization of an npn plasma bipolar junction phototransistor

C. J. Wagner, P. A. Tchertchian, and J. G. Eden

Appl. Phys. Lett. 97, 134102 (2010); http://dx.doi.org/10.1063/1.3488831 (3 pages) | Cited 4 times

Online Publication Date: 29 September 2010

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Coupling e−–h+ and gas phase plasmas with a strong electric field across a potential barrier yields a transistor providing photosensitivity and voltage gain but also a light-emitting collector whose radiative output can be switched and modulated. This optoelectronic device relies on the correspondence between the properties of a low temperature, nonequilibrium plasma and those for the e−–h+ plasma in an n-type semiconductor. Hysteresis observed in the collector current-base current characteristics is attributed primarily to charge stored in the base, and the photogeneration of e−–h+ pairs at the base-collector junction. Extinguishing the collector plasma requires an emitter-base junction reverse bias of <1 V.
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85.60.Dw Photodiodes; phototransistors; photoresistors
72.30.+q High-frequency effects; plasma effects
85.30.Pq Bipolar transistors
85.60.Jb Light-emitting devices

Voltage tunable short wire-pair type of metamaterial infiltrated by nematic liquid crystal

Fuli Zhang, Qian Zhao, Weihong Zhang, Jingbo Sun, Ji Zhou, and Didier Lippens

Appl. Phys. Lett. 97, 134103 (2010); http://dx.doi.org/10.1063/1.3496034 (3 pages) | Cited 13 times

Online Publication Date: 30 September 2010

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In this letter, we report an experimental demonstration on voltage tunable short wire-pair metamaterial with negative permeability at microwave frequencies. After infiltrated by nematic liquid crystal, magnetic resonance of short wire-pair can be effectively tuned via relatively low static electric field. The results show, by increasing bias voltage from 0 to 100 V, magnetic resonance is continuously and reversibly shifted from 9.91 down to 9.55 GHz. Moreover, the effective permeability of metamaterial, for operation frequency around magnetic resonance, varies from negative to positive values. Numerical analysis has a good agreement with experimental results.
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81.05.Xj Metamaterials for chiral, bianisotropic and other complex media
78.67.Pt Multilayers; superlattices; photonic structures; metamaterials
42.70.Df Liquid crystals
78.70.Gq Microwave and radio-frequency interactions

Quantitative evaluation of single-shot inline phase contrast imaging using an inverse compton x-ray source

P. Oliva, M. Carpinelli, B. Golosio, P. Delogu, M. Endrizzi, J. Park, I. Pogorelsky, V. Yakimenko, O. Williams, and J. Rosenzweig

Appl. Phys. Lett. 97, 134104 (2010); http://dx.doi.org/10.1063/1.3491430 (3 pages) | Cited 8 times

Online Publication Date: 30 September 2010

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Inverse compton scattering (ICS) x-ray sources are of current interest in biomedical imaging. We present an experimental demonstration of inline phase contrast imaging using a single picosecond pulse of the ICS source located at the BNL Accelerator Test Facility. The phase contrast effect is clearly observed. Its qualities are shown to be in agreement with the predictions of theoretical models through comparison of experimental and simulated images of a set of plastic wires of differing composition and size. Finally, we display an application of the technique to a biological sample, confirming the possibility of time-resolved imaging on the picosecond scale.
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87.59.B- Radiography
06.60.Jn High-speed techniques (microsecond to femtosecond)
87.64.Bx Electron, neutron and x-ray diffraction and scattering

Experimental demonstration of broadband transmission through subwavelength aperture

Di Bao, Khalid Z. Rajab, Wenxuan Tang, and Yang Hao

Appl. Phys. Lett. 97, 134105 (2010); http://dx.doi.org/10.1063/1.3495995 (3 pages) | Cited 2 times

Online Publication Date: 1 October 2010

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Based on coordinate transformation techniques, a simplified all-dielectric extraordinary-transmission device for broadband transmission through a subwavelength aperture is verified experimentally in this paper. The device is made from isotropic dielectric blocks with permittivity values ranging from 2.1 to 6. It is shown both numerically and experimentally that the device can provide transmission with a −3 dB bandwidth of more than 1 GHz, in a region which would otherwise be a stop band caused by the subwavelength aperture in an X-band waveguide.
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84.40.Az Waveguides, transmission lines, striplines
77.22.Ch Permittivity (dielectric function)

All-angle blockage of sound by an acoustic double-fishnet metamaterial

J. Christensen, L. Martín-Moreno, and F. J. García-Vidal

Appl. Phys. Lett. 97, 134106 (2010); http://dx.doi.org/10.1063/1.3491289 (3 pages) | Cited 4 times

Online Publication Date: 1 October 2010

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In this paper we design an acoustic metamaterial for broadband sound blockage that is easy to fabricate and presents tunable capabilities. Two adjacent holey plates are predicted to support a gap mode which is responsible of a forbidden band, displaying a negative effective bulk modulus. This acoustic metamaterial exhibits a weak dispersion with parallel momentum implying that strong attenuation appears for a broad range of angles of incident sound. Its bandwidth can be tailored at will by varying the separation between the two holey plates.
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43.30.Es Velocity, attenuation, refraction, and diffraction in water, Doppler effect
62.65.+k Acoustical properties of solids
43.25.Ed Effect of nonlinearity on velocity and attenuation
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