Ultra-thin, planar, plasmonic metadevices
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United States of America Patent
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Jun 5, 2018
Issued Date -
Oct 29, 2015
app pub date -
Sep 4, 2013
filing date -
Sep 4, 2012
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Abstract
An ultra-thin planar device is used for arbitrary waveform formation on a micrometer scale, regardless of the incident light's polarization. Patterned perforations are made in a 30 nm-thick metal film, creating discrete phase shifts and forming a desired wavefront of cross-polarized, scattered light. The signal-to-noise ratio of these devices is at least one order of magnitude higher than current metallic nano-antenna designs. The focal length of a lens built on such principle can also be adjusted by changing the wavelength of the incident light. All proposed embodiments can be embedded, for example, on a chip or at the end of an optical fiber.
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