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Published on: April 13, 2016
Active Two-Dimensional Steering of Radiation from a Nanoaperture
Laura S Dreissen1, Hugo F Schouten1, Wim Ubachs1,2
1Department of Physics and Astronomy, LaserLaB , Vrije Universiteit , De Boelelaan 1081 , 1081 HV Amsterdam , The Netherlands.
Abstract:
We experimentally demonstrate control over the direction of radiation of a beam that passes through a square nanoaperture in a metal film. The ratio of the aperture size and the wavelength is such that only three guided modes, each with different spatial symmetries, can be excited. Using a spatial light modulator, the superposition of the three modes can be altered, thus allowing for a controlled variation of the radiation pattern that emanates from the nanoaperture. Robust and stable steering of 9.5° in two orthogonal directions was achieved.
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