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Study Results from University of Maryland Broaden Understanding of General Science (Visible-frequency asymmetric transmission devices incorporating a...

August 15, 2014

Study Results from University of Maryland Broaden Understanding of General Science (Visible-frequency asymmetric transmission devices incorporating a hyperbolic metamaterial)

By a News Reporter-Staff News Editor at Science Letter -- Investigators discuss new findings in Science. According to news reporting from College Park, Maryland, by NewsRx journalists, research stated, "Asymmetric electromagnetic transmission has been recently demonstrated using Lorentz-reciprocal devices, which exploit a variety of patterned structures of linear materials to break spatial inversion symmetry. However, nanofabrication challenges have so far precluded the fabrication of passive transmission structures with highly asymmetric responses at visible frequencies."

The news correspondents obtained a quote from the research from the University of Maryland, "Here we show that high-contrast asymmetric transmission of visible light can be provided by a planar device of wavelength-scale thickness incorporating a pair of nonsymmetric subwavelength gratings and a passive hyperbolic metamaterial engineered to display a transmission window centred at a lateral spatial frequency substantially exceeding the diffraction limit. Fabricated devices designed for operation at central wavelengths of 532 and 633 nm, respectively, display broadband, efficient asymmetric optical transmission with contrast ratios exceeding 14 dB."

According to the news reporters, the research concluded: "Owing to its planar configuration, small footprint and passive operation, this reciprocal transmission approach holds promise for integration within compact optical systems operating at visible frequencies."

For more information on this research see: Visible-frequency asymmetric transmission devices incorporating a hyperbolic metamaterial. Nature Communications, 2014;5():151-157. Nature Communications can be contacted at: Nature Publishing Group, Macmillan Building, 4 Crinan St, London N1 9XW, England. (Nature Publishing Group -; Nature Communications -

Our news journalists report that additional information may be obtained by contacting T. Xu, University of Maryland, Maryland Nano Center, College Park, MD 20742, United States (see also Science).

Keywords for this news article include: Science, Maryland, College Park, United States, North and Central America

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Source: Science Letter

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