Mid-infrared tunable polarization-independent perfect absorber using a phase-change metamaterial

Tun Cao*, Lei Zhang, Robert E. Simpson, Martin J. Cryan

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

81 Citations (Scopus)

Abstract

We present the design of a polarization-independent tunable absorbing metamaterial (MM) in the mid-infrared wavelength regime. Our structure is composed of an array of thin gold (Au) squares separated from a continuous Au film by a phase-change material (PCM) layer. It is shown that a 10% tuning of the absorbance peak can be obtained by switching the PCM between its amorphous and crystalline states. The strong absorbance shows a substantial overlap between TE and TM polarization states over a wide range of incident angles. The electric field, magnetic field, and current distributions in the absorber are investigated to further explain the physical origin of the absorption. The study provides a path toward the realization of tunable absorbers for applications, such as selective thermal emitters, sensors, and bolometers. (C) 2013 Optical Society of America

Original languageEnglish
Pages (from-to)1580-1585
Number of pages6
JournalJournal of the Optical Society of America B
Volume30
Issue number6
DOIs
Publication statusPublished - Jun 2013

Keywords

  • LOW-FREQUENCY PLASMONS
  • BROAD-BAND
  • NEGATIVE-INDEX
  • ABSORPTION
  • REFRACTION
  • SURFACE
  • DESIGN

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