posted on 2023-11-30, 06:41authored byLaura S. Dreissen, Hugo F. Schouten, Wim Ubachs, Shreyas B. Raghunathan, Taco D. Visser
We experimentally demonstrate control over the direction of radiation of a beam that passes through a square nano-aperture 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 nano-aperture. Robust and stable steering of 9.5 degree in two orthogonal directions was achieved.
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