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5 Jan 2009

Volume 94, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 94, 013102 (2009); http://dx.doi.org/10.1063/1.3062938 (3 pages)

Hao-Chih Yuan, Jonghyun Shin, Guoxuan Qin, Lei Sun, Pallab Bhattacharya, Max G. Lagally, George K. Celler, and Zhenqiang Ma
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Dependence of zeta potential on polyelectrolyte moving through a solid-state nanopore

Ding Kejian, Sun Weimin, Zhang Haiyan, Peng Xianglei, and Hu Honggang

Appl. Phys. Lett. 94, 014101 (2009); http://dx.doi.org/10.1063/1.3065029 (3 pages) | Cited 3 times

Online Publication Date: 6 January 2009

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This paper presents a method for establishing the relationship between the zeta potential and the movement of polyelectrolyte through a solid-state nanopore by employing electrostatic-hydrodynamic theory. The influence of the salt concentration, the surface charge density, the zeta potential, and the relationship between them are discussed. For a selected polyelectrolyte driven by an electric field, the dependence of the zeta potential on the velocity of polyelectrolyte translocation is shown, which demonstrates that polyelectrolyte movement is mediated by the zeta potential and predicts that surface charge modification can become an effective means for managing and regulating polyelectrolyte translocation.
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82.45.Gj Electrolytes
82.45.Fk Electrodes
61.46.-w Structure of nanoscale materials

Complete photonic bandgaps in the visible range from spherical layer structures in dichromate gelatin emulsions

Jenny Hung, Mang Hin Kok, and Wing Yim Tam

Appl. Phys. Lett. 94, 014102 (2009); http://dx.doi.org/10.1063/1.3064165 (3 pages) | Cited 4 times

Online Publication Date: 6 January 2009

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We have fabricated spherical layer structures that exhibit complete photonic bandgaps in the visible range in dichromate gelatin emulsions by holographic interference. The complete bandgap was not a result of the high dielectric contrast but was due to the fact that the spherical layer structure was isotropic with equal spacing in all accessible directions. Angular dependence spectral measurements of the spherical layer structures were in good agreement with the expected results from an ideal structure of dielectric concentric spherical shells with equal spacing. Our fabrication technique and results could pave the way for new applications using complete bandgap photonic crystals.
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42.70.Qs Photonic bandgap materials
82.70.Gg Gels and sols
82.70.Kj Emulsions and suspensions
42.40.-i Holography
42.40.My Applications
78.40.-q Absorption and reflection spectra: visible and ultraviolet
42.82.Cr Fabrication techniques; lithography, pattern transfer

Experimental verification of broadband cloaking using a volumetric cloak composed of periodically stacked cylindrical transmission-line networks

Pekka Alitalo, Frédéric Bongard, Jean-Francois Zürcher, Juan Mosig, and Sergei Tretyakov

Appl. Phys. Lett. 94, 014103 (2009); http://dx.doi.org/10.1063/1.3068749 (3 pages) | Cited 27 times

Online Publication Date: 9 January 2009

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Cloaking using a volumetric structure composed of stacked two-dimensional transmission-line networks is verified with numerical simulations and measurements. The measurements are done in a waveguide, in which an array of metal cylinders is inserted causing a short circuit in the waveguide. The metal cylinders are cloaked using the transmission-line structure, which “hides” the cylinders and thus enables wave propagation inside the waveguide.
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84.40.Az Waveguides, transmission lines, striplines
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