Optically Modulated Multiband Terahertz Perfect Absorber

Research output: Contribution to journalJournal article – Annual report year: 2014Researchpeer-review

  • Author: Seren, Huseyin R.

    Boston University, United States

  • Author: Keiser, George R.

    Boston University, United States

  • Author: Cao, Lingyue

    Boston University, United States

  • Author: Zhang, Jingdi

    Boston University, United States

  • Author: Strikwerda, Andrew

    Teraherts Technologies and Biophotonics, Department of Photonics Engineering, Technical University of Denmark, Ørsteds Plads, 2800, Kgs. Lyngby, Denmark

  • Author: Fan, Kebin

    Boston University, United States

  • Author: Metcalfe, Grace D.

    United States Army Research Laboratory, United States

  • Author: Wraback, Michael

    United States Army Research Laboratory, United States

  • Author: Zhang, Xin

    Boston University, United States

  • Author: Averitt, Richard D.

    Boston University, United States

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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
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

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

ID: 102748781