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14 Jul 2008

Volume 93, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 93, 023303 (2008); http://dx.doi.org/10.1063/1.2953179 (3 pages)

Takafumi Kawanishi, Takaaki Fujiwara, Megumi Akai-Kasaya, Akira Saito, Masakazu Aono, Junichi Takeya, and Yuji Kuwahara
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Dynamic tuning of an infrared hybrid-metamaterial resonance using vanadium dioxide

T. Driscoll, S. Palit, M. M. Qazilbash, M. Brehm, F. Keilmann, Byung-Gyu Chae, Sun-Jin Yun, Hyun-Tak Kim, S. Y. Cho, N. Marie Jokerst, D. R. Smith, and D. N. Basov

Appl. Phys. Lett. 93, 024101 (2008); http://dx.doi.org/10.1063/1.2956675 (3 pages) | Cited 50 times

Online Publication Date: 14 July 2008

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We demonstrate a metamaterial device whose far-infrared resonance frequency can be dynamically tuned. Dynamic tuning should alleviate many bandwidth-related roadblocks to metamaterial application by granting a wide matrix of selectable electromagnetic properties. This tuning effect is achieved via a hybrid-metamaterial architecture; intertwining split ring resonator metamaterial elements with vanadium dioxide (VO2)-a material whose optical properties can be strongly and quickly changed via external stimulus. This hybrid structure concept opens a fresh dimension in both exploring and exploiting the intriguing electromagnetic behavior of metamaterials.
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42.70.-a Optical materials
42.65.-k Nonlinear optics

A rational approach to noise discrimination in video microscopy particle tracking

Thierry Savin, Patrick T. Spicer, and Patrick S. Doyle

Appl. Phys. Lett. 93, 024102 (2008); http://dx.doi.org/10.1063/1.2957464 (3 pages) | Cited 3 times

Online Publication Date: 14 July 2008

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The authors describe a rational approach to an important step in video microscopy particle tracking called noise discrimination. Using the morphology of the brightness profiles produced by the particles, false and dubious detections are eliminated from the valid tracking data. This selection process is found to affect the spatial resolution ε and the depth zb of the tracking. Accordingly, it is shown that a stringent selection of the particles closest to the focal plane improves the spatial resolution (i.e., decreases ε) but also diminishes zb. The authors further demonstrate that the statistical accuracy is worsened by lower zb. Noise discrimination thus has a critical influence on the overall performance of the particle tracking technique.
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07.60.Pb Conventional optical microscopes

Molecular orientation in diindenoperylene thin films deposited on polycrystalline gold

M. B. Casu, I. Biswas, B.-E. Schuster, M. Nagel, P. Nagel, S. Schuppler, and T. Chassé

Appl. Phys. Lett. 93, 024103 (2008); http://dx.doi.org/10.1063/1.2957474 (3 pages) | Cited 12 times

Online Publication Date: 14 July 2008

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We present x-ray photoemission spectroscopy (XPS) and near-edge x-ray absorption fine structure spectroscopy measurements taken on diindenoperylene (DIP) thin films of different thicknesses deposited on polycrystalline gold. Our investigations show that DIP films present flat lying molecules in the first layer, while the angle between the molecular axis and the surface increases with thickness. By using XPS, we find evidence for Stranski–Krastanov growth mode.
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68.55.am Polymers and organics
79.60.Fr Polymers; organic compounds
78.70.Dm X-ray absorption spectra
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