Experimental verification of total absorption by a low-loss thin dielectric layer
Hibbins, Alastair P.
Applied Physics Letters
American Institute of Physics (AIP)
This work presents an experimental demonstration of total absorption by a metal-dielectric metasurface. Following a theoretical proposal [Díaz-Rubio et al., Phys. Rev. B 89, 245123 (2014)], we have designed and fabricated a metasurface consisting of a low absorbing dielectric layer (made of FR4) placed on top of a metallic surface patterned with a square array of coaxial cavities. For p-polarized waves, a low frequency peak with perfect absorption is observed. The behavior of this peak has been experimentally characterized for different dielectric layer thicknesses, coaxial cavity lengths, and angles of incidence. The experimental results are in excellent agreement with numerical simulation and corroborate the theoretical predictions.
Spanish Ministerio de Economía y Competitividad (MINECO)
USA office of Naval Research
Copyright © 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters, Volume 106 (24), article 241604, and may be found at http://dx.doi.org/10.1063/1.4922801
Vol. 106 (24), article 241604