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28 May 2012

Volume 100, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 100, 222402 (2012); http://dx.doi.org/10.1063/1.3700809 (4 pages)

Felix Balhorn, Simon Jeni, Wolfgang Hansen, Detlef Heitmann, and Stefan Mendach
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Polarization-tunable polariton excitation in a compound plasmonic crystal

Lin Zhou, Xia-Mei Tang, Cheng-Ping Huang, Yi Zhang, and Yong-Yuan Zhu

Appl. Phys. Lett. 100, 221901 (2012); http://dx.doi.org/10.1063/1.4722937 (4 pages)

Online Publication Date: 29 May 2012

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Propagation of an electromagnetic (EM) wave through a compound plasmonic crystal composed of perpendicularly arranged gold nanorod pairs has been studied. Because of the strong coupling between the EM wave and vibrations of free electrons inside nanorod pairs, the polarization-tunable polariton stop band as well as pronounced polarization conversion can be achieved in the compound plasmonic crystal. A theory based on Huang-Kun-like equations is presented to reveal the mechanism, which agrees well with the simulations. Our results may shed light on the structure design and physical understandings on the anisotropic metamaterials.
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71.36.+c Polaritons (including photon-phonon and photon-magnon interactions)
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
73.22.Lp Collective excitations
78.66.Bz Metals and metallic alloys

Correlating whisker growth and grain structure on Sn-Cu samples by real-time scanning electron microscopy and backscattering diffraction characterization

Fei Pei, Nitin Jadhav, and Eric Chason

Appl. Phys. Lett. 100, 221902 (2012); http://dx.doi.org/10.1063/1.4721661 (4 pages) | Cited 4 times

Online Publication Date: 29 May 2012

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Whiskers/hillocks grow out of Pb-free Sn coatings used in electronics manufacturing. To determine which grains form whiskers/hillocks, we use scanning electron microscopy and backscattering diffraction to simultaneously monitor the surface morphology and grain structure. To reduce surface roughness, we developed a “peel-off” method to prepare ultra-flat samples that were measured repeatedly while whiskers/hillocks formed. We find grains that form into whiskers/hillocks are present in the as-deposited film (i.e., not re-nucleated) and many have horizontal grain boundaries beneath them. Grain rotation during whisker/hillock formation means that measurements performed after the features grow do not indicate their initial grain orientations.
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68.70.+w Whiskers and dendrites (growth, structure, and nonelectronic properties)
79.20.Kz Other electron-impact emission phenomena
81.05.Bx Metals, semimetals, and alloys
68.35.B- Structure of clean surfaces (and surface reconstruction)
68.55.A- Nucleation and growth

Realizing almost perfect bending waveguides with anisotropic epsilon-near-zero metamaterials

Jie Luo, Ping Xu, Huanyang Chen, Bo Hou, Lei Gao, and Yun Lai

Appl. Phys. Lett. 100, 221903 (2012); http://dx.doi.org/10.1063/1.4723844 (5 pages) | Cited 9 times

Online Publication Date: 31 May 2012

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We study metamaterials with an anisotropic permittivity tensor in which one component is near zero. We find that such an anisotropic metamaterial can be used to control wave propagation and construct almost perfect bending waveguides with a high transmission rate (>95%). This interesting effect originates in the power flow redistribution by the surface waves on the input and output interfaces, which smoothly matches with the propagating modes inside the metamaterial waveguide. We also find that waves in such anisotropic epsilon-near-zero materials can be reflected by small-sized perfect magnetic conductor defects. Numerical calculations have been performed to confirm the above effects.
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42.79.Gn Optical waveguides and couplers
42.70.-a Optical materials
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