4.6 Article

Anomalous refraction of light through slanted-nanoaperture arrays on metal surface

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APPLIED PHYSICS LETTERS
卷 107, 期 10, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.4930818

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  1. NSF [NIRT-ECS-0403865, ECS-0424210, ECCS-0925532]

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We report a nanoapertured metal surface that demonstrates anomalous refraction of light for a wide range of incident angles. A nanoslit aperture is designed to serve as a tilted vertical-dipole whose radiation pattern orients to a glancing angle direction to substrate. An array of such slanted nano-slits formed in a metal film redirects an incident beam into the direction of negative refraction angle: the aperture-transmitted wave makes a far-field propagation to the tilt-oriented direction of radiation pattern. The thus-designed nanoaperture array demonstrates the -1st order diffraction (i.e., to the negative refraction-angle direction) with well-suppressed background transmission (the zero-order direct transmission and other higher-order diffractions). Engineering the radiation pattern of nanoaperture offers an approach to overcoming the limits of conventional diffractive/refractive optics and complementing metasurface-based nano-optics. (C) 2015 AIP Publishing LLC.

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