Optically Modulated Multiband Terahertz Perfect Absorber

Huseyin R. Seren, George R. Keiser, Lingyue Cao, Jingdi Zhang, Andrew Strikwerda, Kebin Fan, Grace D. Metcalfe, Michael Wraback, Xin Zhang, Richard D. Averitt

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Development of tunable, dynamic, and broad bandwidth metamaterialdesigns is a keystone objective for metamaterials research, necessary for thefuture viability of metamaterial optics and devices across the electromagneticspectrum. Yet, overcoming the inherently localized, narrow bandwidth, andstatic response of resonant metamaterials continues to be a challengingendeavor. Resonant perfect absorbers have flourished as one of the mostpromising metamaterial devices with applications ranging from power har-vesting to terahertz imaging. Here, an optically modulated resonant perfectabsorber is presented. Utilizing photo-excited free carriers in silicon padsplaced in the capacitive gaps of split ring resonators, a dynamically modu-lated perfect absorber is designed and fabricated to operate in reflection.Large modulation depth (38% and 91%) in two absorption bands (with 97%and 92% peak absorption) is demonstrated, which correspond to the LC(0.7 THz) and dipole (1.1 THz) modes of the split ring resonators.
Original languageEnglish
JournalAdvanced Optical Materials
Volume2
Issue number12
Pages (from-to)1221–1226
ISSN2195-1071
DOIs
Publication statusPublished - 2014

Keywords

  • Metamaterials
  • Metamaterial absorbers
  • Optical modulation
  • Optics
  • Terahertz

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