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Yakov M. Strelniker David J. Bergman 《Journal of magnetism and magnetic materials》2009,321(7):814-817
The strong-field magneto-transport in a generic three-dimensional composite with a periodic microstructure where all the constituents are normal metals is considered. The macroscopic response in such systems turns out to be considerably simpler than it is in the absence of a magnetic field. Closed form asymptotic expressions are found for the microscopic current distributions and macroscopic effective magneto-resistivity tensor components. Numerical calculations of the current distributions and effective magneto-resistivity tensor components are also performed and compared with the closed form asymptotic expressions. A new critical point is identified. 相似文献
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Control of extraordinary light transmission through perforated metal films using liquid crystals 总被引:1,自引:0,他引:1
Y. M. Strelniker D. Stroud A. O. Voznesenskaya 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,52(1):1-7
We calculate the effective dielectric tensor of a metal film penetrated by cylindrical holes filled with a nematic liquid
crystal (NLC). We assume that the director of the NLC is parallel to the film, and that its direction within the plane can
be controlled by a
static magnetic field, via the Freedericksz effect. To calculate the effective dielectric tensor, we consider both randomly
distributed holes (using a Maxwell-Garnett approximation) and a
square lattice of holes (using a Fourier technique). Both the holes and the lattice constant of the square lattice are assumed
small compared to the wavelength. The films are found to exhibit
extraordinary light transmission at special frequencies related to
the surface plasmon resonances of the composite film. Furthermore,
the frequencies of peak transmission are found to be substantially
split when the dielectric in the holes is anisotropic. For typical
NLC parameters, the splitting is of order 5–10% of the metal plasma
frequency. Thus, the extraordinary transmission can be controlled by
a static magnetic or electric field whose direction can be rotated
to orient the director of the NLC. Finally, as a practical means
of producing the NLC-filled holes, we consider the case where the
entire perforated metal film is dipped into a pool of NLC,
so that all the holes are filled with the NLC, and there are also
homogeneous slabs of NLC on both sides of the film. The
transmission in this geometry is shown to have similar
characteristics to that in which the NLC-filled screen is placed in air. 相似文献
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Y. Fleger M. Rosenbluh Y. M. Strelniker D. J. Bergman A. N. Lagarkov 《The European Physical Journal B - Condensed Matter and Complex Systems》2011,81(1):85-93
The extinction spectrum of a
dielectric film with periodic array of metallic
islands of different shapes and different
mutual distances
was studied both theoretically
and experimentally. It is shown, analytically,
numerically and experimentally, that the
positions of the surface plasmon resonances depend on
the nano-structural details.
We propose two ways of controlling plasmon resonance frequency:
changing the aspect ratio
of the elliptical (or rectangular) islands and changing their
mutual distances.
A new analytical asymptotic approach for calculating the optical
properties of such plasmonic systems is developed.
The results of our analytical and numerical studies are in
good qualitative agreement with experiment. 相似文献
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