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2 Nov 2009

Volume 95, Issue 18, Articles (18xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 183504 (2009); http://dx.doi.org/10.1063/1.3256223 (3 pages)

Hoon-Sik Kim, Sang Min Won, Young-Geun Ha, Jong-Hyun Ahn, Antonio Facchetti, Tobin J. Marks, and John A. Rogers
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Individual charge-trapping dislocations in an ionic insulator

Zhongchang Wang, Susumu Tsukimoto, Mitsuhiro Saito, and Yuichi Ikuhara

Appl. Phys. Lett. 95, 184101 (2009); http://dx.doi.org/10.1063/1.3259778 (3 pages) | Cited 2 times

Online Publication Date: 5 November 2009

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Insulating oxide materials find widespread technological applications where how their inside dislocations behave are known to influence or control performance. Here we demonstrate, by first-principles calculations on MgO, that individual dislocations can trap charges within empty space around their cores in an unusual pipelike way, regardless of whether the charges are produced via external excitation or impurity doping. Such effect of dislocations is crucial for many applied physics issues as well as opens up an avenue for exploring functional devices based on the confined charges.
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61.72.Bb Theories and models of crystal defects
61.72.up Other materials
71.15.-m Methods of electronic structure calculations
71.20.Ps Other inorganic compounds

Infrared carpet cloak designed with uniform silicon grating structure

Xiaofei Xu, Yijun Feng, Yu Hao, Juming Zhao, and Tian Jiang

Appl. Phys. Lett. 95, 184102 (2009); http://dx.doi.org/10.1063/1.3259775 (3 pages) | Cited 12 times

Online Publication Date: 6 November 2009

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Through a particularly chosen coordinate transformation, we propose an optical carpet cloak that only requires homogeneous anisotropic dielectric material. The proposed cloak could be easily imitated and realized by alternative layers of isotropic dielectrics. To demonstrate the cloaking performance, we have designed a two-dimensional version that a uniform silicon grating structure fabricated on a silicon-on-insulator wafer could work as an infrared carpet cloak. The cloak has been validated through full wave electromagnetic simulations, and the nonresonance feature also enables a broadband cloaking for wavelengths ranging from 1372 to 2000 nm.
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42.79.Dj Gratings

Effect of pressure on electrospray characteristics

Ioan Marginean, Jason S. Page, Ryan T. Kelly, Keqi Tang, and Richard D. Smith

Appl. Phys. Lett. 95, 184103 (2009); http://dx.doi.org/10.1063/1.3258494 (3 pages) | Cited 4 times

Online Publication Date: 6 November 2009

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An experimental study of pulsating electrosprays operated at subambient pressure is reported. The pressure domain that affords stable electrospray operation appears to be limited by the vapor pressure of the liquid. The voltage driving the electrospray is shown to have a logarithmic dependence on pressure. The observed scaling amends the relationship currently used to calculate the electric field at the tip of the meniscus of an electrified liquid.
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47.57.-s Complex fluids and colloidal systems
47.65.-d Magnetohydrodynamics and electrohydrodynamics
82.70.Rr Aerosols and foams
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