Quality factor assessment of subwavelength resonant cavities at FIR frequencies

George Goussetis, Alexandros P Feresidis, Rebecca Cheung

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Subwavelength resonators at FIR are presented and studied. The structures consist of 1D cavities formed between a metallized (silver) surface and a metamaterial surface comprising a periodic array of silver patches on a silver-backed silicon substrate. The concept derives from recent discoveries of artificial magnetic conductors (AMC). By studying the currents excited on the metamaterial surface by a normally incident plane wave, the nature of the emerging resonant phenomena and the physical mechanism underlying the AMC operation are investigated. Full wave simulations, based on finite element method and time-domain transmission line modelling technique, have been carried out to demonstrate the effective AMC boundary condition and prove the possibilities for subwavelength cavities. The quality factor of the resonant cavities is assessed as a function of the cavity profile. It is demonstrated that the quality factor drops to about 1/8 of the half-wavelength value for a ?/8 resonant cavity. © 2007 IOP Publishing Ltd.

Original languageEnglish
Pages (from-to)S355-S360
Number of pages6
JournalJournal of Optics A: Pure and Applied Optics
Volume9
Issue number9
DOIs
Publication statusPublished - Sep 2007
Event1st European Topical Meeting on Nanophotonics and Metamaterials - Seefeld, Austria
Duration: 8 Jan 200711 Jan 2007

Keywords

  • quality factor
  • artificial magnetic conductor
  • infrared filter
  • metamaterials
  • resonant cavities
  • surfaces
  • antennas

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