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Polarization Components (polarization + component)

Distribution by Scientific Domains

Physics and Astronomy	50%

Selected Abstracts

Numerical study of polarization-dependent focusing for a bilayer planar FSS reflective lens at millimeter wavelengths

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2004
Natalia Bliznyuk
Abstract In this paper, we numerically analyze the polarization-dependent focusing properties of a planar reflective lens formed by two parallel layers of nonuniform "gangbuster" surfaces (GSs) above a ground plane. Since these GSs consist of superdense arrays of thin finite-length parallel metallic wires, the desired phase patterns on such a lens surface are achieved by adjusting the lengths of these metallic wires for appropriate polarization components. In our analysis, we use the method of moments (MoM) and the transmission-lines analogy, along with the surface-equivalence theorem, to estimate the field intensity in the focal plane. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 361,365, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11382 [source]

Commercial applications of porous Si: optical filters and components

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 6 2007
V. Kochergin
Abstract It is shown that porous Silicon in various geometries and morphologies can be used for novel optical elements by combining theoretical insights with suitable porous structures and some pre- and post-processing of the Silicon. The paper restricts itself to light propagation in the pore direction. Theoretical and experimental results will be presented for the following novel optical elements: environmentally stable optical components from mesoporous Silicon, long wave pass filters, macroporous Silicon UV Filters, and polarization components for the UV range. Either new components are presented, mostly with first experimental results, or the state-of-the art for previously discussed elements is considerably improved upon. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Selection between hexagonal, square and stripe patterns in a polarization instability: an experimental investigation

ANNALEN DER PHYSIK, Issue 7-8 2004
A. Aumann
Abstract The paper reports on experimental results on pattern selection in a nonlinear optical system based on a single-mirror feedback-scheme. Zeeman pumping in sodium vapor is utilized as optical nonlinearity. Above a certain power threshold the unstructured state with defined polarization becomes simultaneously unstable against a pattern forming and a polarization instability. In the resulting patterns the right- and left-hand circular polarization components of the light field tend to separate in space. The pattern selection depends crucially on the polarization ellipticity of the input beam. Transitions between positive and negative hexagons via stripes or squares are observed. They are determined by the symmetry of the interaction between the spin of the light field and the atomic spin and are considered as experimental demonstrations of general principles of pattern formation. [source]

Sensitivity Enhancement in Two-Dimensional Solid-State NMR Spectroscopy by Transverse Mixing

CHEMPHYSCHEM, Issue 6 2004
Robert Tycko Dr.
Abstract The sensitivity of two-dimensional (2D) 13C,13C solid-state NMR spectroscopy under magic-angle spinning (MAS) is shown to be enhanced by the use of transverse polarization transfer in place of the conventional longitudinal polarization transfer. Experimental results are reported for 2D spectroscopy of a 20-residue, filament-forming peptide derived from the E. coli RecA protein, containing five uniformly 13C-labeled residues, performed at 14.1 T with high-speed MAS and with finite-pulse radio-frequency-driven recoupling of dipolar interactions in the mixing period. Significant sensitivity enhancements observed at short mixing periods result from a more rapid build-up of cross-peaks under transverse mixing than under longitudinal mixing and from the gain inherent in 2D measurements in which both orthogonal transverse polarization components in the t1 period contribute to each free-induction decay signal detected in the t2 period. [source]