4.6 Article

Switchable wavelength-selective and diffuse metamaterial absorber/emitter with a phase transition spacer layer

Journal

APPLIED PHYSICS LETTERS
Volume 105, Issue 7, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.4893616

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Funding

  1. New Faculty Startup fund at Arizona State University

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We numerically demonstrate a switchable metamaterial absorber/emitter by thermally turning on or off the excitation of magnetic resonance upon the phase transition of vanadium dioxide (VO2). Perfect absorption peak exists around the wavelength of 5 mu m when the excitation of magnetic resonance is supported with the insulating VO2 spacer layer. The wavelength-selective absorption is switched off when the magnetic resonance is disabled with metallic VO2 that shorts the top and bottom metallic structures. The resonance wavelength can be tuned with different geometry, and the switchable metamaterial exhibits diffuse behaviors at oblique angles. The results would facilitate the design of switchable metamaterials for active control in energy and sensing applications. (C) 2014 AIP Publishing LLC.

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