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2 Jul 2012

Volume 101, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 101, 013701 (2012); http://dx.doi.org/10.1063/1.4730945 (5 pages)

Frederick Gertz, Rustam Azimov, and Alexander Khitun
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Experimental demonstration of an isotropic metamaterial super lens with negative unity permeability at 8.5 MHz

C. P. Scarborough, Z. H. Jiang, D. H. Werner, C. Rivero-Baleine, and C. Drake

Appl. Phys. Lett. 101, 014101 (2012); http://dx.doi.org/10.1063/1.4732158 (3 pages)

Online Publication Date: 2 July 2012

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We report a low frequency magnetic metamaterial super lens operating at 8.5 MHz. The super lens, composed of a slab of metamaterial with an isotropic effective permeability of negative unity, is capable of resolving two closely spaced magnetic sources that are indistinguishable in the absence of the lens, while simultaneously increasing the magnetic field strength observed in the image plane. Measurements of a prototype demonstrated the increased field strength and a resolution of 1/441 wavelengths, representing a new state-of-the-art in metamaterial-assisted near-field imaging.
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42.79.Bh Lenses, prisms and mirrors
42.70.-a Optical materials

In-situ characterization of free-volume holes in polymer thin films under controlled humidity conditions with an atmospheric positron probe microanalyzer

Wei Zhou, Zhe Chen, Nagayasu Oshima, Kenji Ito, Brian E. O’Rourke, Ryunosuke Kuroda, Ryoichi Suzuki, Hiroshi Yanagishita, Takuro Tsutsui, Akira Uedono, and Noriyosu Hayashizaki

Appl. Phys. Lett. 101, 014102 (2012); http://dx.doi.org/10.1063/1.4729425 (3 pages) | Cited 2 times

Online Publication Date: 2 July 2012

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A pulsed, slow positron beam, with a diameter of 200 μm, was extracted into air through a thin SiN window of an atmospheric positron probe microanalyzer (PPMA), and used to measure the ortho-positronium lifetimes τ in polyvinyl alcohol and polycaprolactam sub-μm-thick films. By measuring the variation of τ as a function of relative humidity, the effect of water molecules on the hole sizes, deduced from τ, was examined for the films with consideration to the chain mobility. The results demonstrate the usefulness of the atmospheric PPMA to the in-situ characterization of nanoscopic holes in thin films under practical conditions.
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68.55.am Polymers and organics
61.41.+e Polymers, elastomers, and plastics
61.46.-w Structure of nanoscale materials
61.80.Fe Electron and positron radiation effects
78.70.Bj Positron annihilation

Charged droplet transportation under direct current electric fields as a cell carrier

Chiun-Peng Lee (李俊鵬), Hsien-Chih Chang (張憲志), and Zung-Hang Wei (衛榮漢)

Appl. Phys. Lett. 101, 014103 (2012); http://dx.doi.org/10.1063/1.4733611 (4 pages) | Cited 2 times

Online Publication Date: 6 July 2012

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This study verifies the reliability of the cell transport through charged droplets under DC electrical fields. Over 90% cell viability can be obtained after charging and discharging for thousands of times. The high cell viability indicates that the electrical charging of a droplet barely influences the cells inside over a long working period. DC field induced AC electrical signals via droplet motion are also observed and analyzed quantitatively. The measured AC signals help us understand the charge transfer of a droplet during charging and discharging processes.
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87.80.Kc Electrochemical techniques
87.80.Fe Micromanipulation of biological structures
87.50.ch Electrophoresis/dielectrophoresis and other mechanical effects
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