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Design of metamaterial surfaces with broadband absorbance

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Abstract

A simple design paradigm for making broadband ultrathin plasmonic absorbers is introduced. The absorber’s unit cell is composed of subunits of various sizes, resulting in nearly 100% absorbance at multiple adjacent frequencies and high absorbance over a broad frequency range. A simple theoretical model for designing broadband absorbers is presented. It uses a single-resonance model to describe the optical response of each subunit and employs the series circuit model to predict the overall response. Validity of the circuit model relies on short propagation lengths of the surface plasmons.

©2012 Optical Society of America

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