Optically switchable photonic metasurfaces
Waters, R. F.
Hobson, P. A.
MacDonald, K. F.
Zheludev, Nikolay I.
Date of Issue2015
School of Physical and Mathematical Sciences
We experimentally demonstrate an optically switchable gallium-based metasurface, in which a reversible light-induced transition between solid and liquid phases occurring in a confined nanoscale surface layer of the metal drives significant changes in reflectivity and absorption. The metasurface architecture resonantly enhances the metal's “active plasmonic” phase-change nonlinearity by an order of magnitude, offering high contrast all-optical switching in the near-infrared range at low, μW μm−2, excitation intensities.
Applied Physics Letters
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