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13 Dec 2010

Volume 97, Issue 24, Articles (24xxxx)

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Appl. Phys. Lett. 97, 241101 (2010); http://dx.doi.org/10.1063/1.3525583 (3 pages)

Kanghee Lee and Jaewook Ahn
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Local x-ray structure analysis of optically manipulated biological micro-objects

Dan Cojoc, Heinz Amenitsch, Enrico Ferrari, Silvia C. Santucci, Barbara Sartori, Michael Rappolt, Benedetta Marmiroli, Manfred Burghammer, and Christian Riekel

Appl. Phys. Lett. 97, 244101 (2010); http://dx.doi.org/10.1063/1.3525941 (3 pages)

Online Publication Date: 14 December 2010

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X-ray diffraction using micro- and nanofocused beams is well suited for nanostructure analysis at different sites of a biological micro-object. To conduct in vitro studies without mechanical contact, we developed object manipulation by optical tweezers in a microfluidic cell. Here we report x-ray microdiffraction analysis of a micro-object optically trapped in three dimensions. We revealed the nanostructure of a single starch granule at different points and investigated local radiation damage induced by repeated x-ray exposures at the same position, demonstrating high stability and full control of the granule orientation by multiple optical traps.
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87.80.Cc Optical trapping
87.80.Ek Mechanical and micromechanical techniques
87.64.Bx Electron, neutron and x-ray diffraction and scattering
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
47.85.Np Fluidics
42.50.Wk Mechanical effects of light on material media, microstructures and particles

Superconducting microfabricated ion traps

Shannon X. Wang, Yufei Ge, Jaroslaw Labaziewicz, Eric Dauler, Karl Berggren, and Isaac L. Chuang

Appl. Phys. Lett. 97, 244102 (2010); http://dx.doi.org/10.1063/1.3526733 (3 pages)

Online Publication Date: 14 December 2010

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We fabricate superconducting ion traps with niobium and niobium nitride and trap single 88Sr ions at cryogenic temperatures. The superconducting transition is verified and characterized by measuring the resistance and critical current using a four-wire measurement on the trap structure, and observing change in the rf reflection. The lowest observed heating rate is 2.1(3) quanta/s at 800 kHz at 6 K and shows no significant change across the superconducting transition, suggesting that anomalous heating is primarily caused by noise sources on the surface. This demonstration of superconducting ion traps opens up possibilities for integrating trapped ions and molecular ions with superconducting devices.
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85.25.-j Superconducting devices
37.10.Gh Atom traps and guides
37.10.Ty Ion trapping
74.25.Sv Critical currents
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

Fano profiles in transmission spectra of terahertz radiation through one-dimensional periodic metallic structures

B. Pradarutti, G. Torosyan, M. Theuer, and R. Beigang

Appl. Phys. Lett. 97, 244103 (2010); http://dx.doi.org/10.1063/1.3526756 (3 pages) | Cited 1 time

Online Publication Date: 15 December 2010

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The transmission properties of broadband terahertz radiation through one-dimensional periodic metallic structures are investigated experimentally, and the obtained results are explained theoretically. Characteristic minima known as Wood’s anomalies are observed in the transmission spectra. The measured line shapes, the so-called Fano profiles, are caused by the coupling between resonant surface plasmons excited on the metallic grating and nonresonant diffraction orders. Numerical simulations using classical electrodynamics are in good agreement with the experiments.
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78.70.Gq Microwave and radio-frequency interactions
71.36.+c Polaritons (including photon-phonon and photon-magnon interactions)
02.60.-x Numerical approximation and analysis
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

Effect of metal diffusion on mechanoelectric property of ionic polymer-metal composite

Rashi Tiwari and Kwang J. Kim

Appl. Phys. Lett. 97, 244104 (2010); http://dx.doi.org/10.1063/1.3517447 (3 pages) | Cited 2 times

Online Publication Date: 15 December 2010

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Ionic polymer-metal composite (IPMC) manufactured through electroless deposition has distinct electrode intermediate and polymer layers. Models typically study the ion motion inside the polymer layer, neglecting the electrode and intermediate layers. However, it must be noted that IPMC properties are affected by the physics of each layer and the coupling between them. In this paper, a physical phenomenological model explicitly describing the role of each layer is developed. The model predicts (i) the mechanoelectric behavior, (ii) the frequency response, and (iii) the geometric scalability effect on IPMC.
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61.41.+e Polymers, elastomers, and plastics
81.15.Pq Electrodeposition, electroplating
66.30.-h Diffusion in solids
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