Doping tunable enhanced extraordinary optical transmission gratings

D. Wasserman, J. Cederberg, E. A. Shaner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We demonstrate doping-tunable mid-infrared extraordinary transmission through periodic sub-wavelength openings in thin metal films. This effect, known as extraordinary optical transmission, is thought to result from the excitation of Surface Plasmon Polaritons at the metal/dielectric interface. The metal aperture arrays studied were fabricated upon GaAs substrates. Because the dielectric constant of a semiconductor changes with carrier concentration, identical metallic grating show different spectral characteristics as a function of GaAs epilayer doping. Thus, the resonant transmission peaks of our grating structures can be shifted by varying the doping of the n-GaAs epilayer upon which they are fabricated. We demonstrate peak shifts of 37 cm-1, or approximately 0.33 urn, as we move from undoped GaAs layer to highly doped n-GaAs layers. Additionally, we study the effect of doping layer thickness on the resonant transmission peak position, which allows for an estimate of the surface plasmon strength as a function of distance from the metal/dielectric interface. Furthermore, we present calculated results for our samples and compare them to our experimental results and propose an explanation for the slight discrepancy between theoretical and experimental results. The devices presented could eventually lead to voltage-tunable mid-IR mirrors, filters, or modulators.

Original languageEnglish (US)
Title of host publicationInfrared, Mid-IR, and Terahertz Technologies for Health and the Environment II
DOIs
StatePublished - Dec 1 2007
EventInfrared, Mid-IR, and Terahertz Technologies for Health and the Environment II - Boston, MA, United States
Duration: Sep 10 2007Sep 10 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6760
ISSN (Print)0277-786X

Other

OtherInfrared, Mid-IR, and Terahertz Technologies for Health and the Environment II
Country/TerritoryUnited States
CityBoston, MA
Period9/10/079/10/07

Keywords

  • Extraordinary optical transmission
  • Mid-infrared
  • Surface plasmons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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