Slow surface phonon polaritons for sensing in the midinfrared spectrum

Igal Balin, Nir Dahan, Vladimir Kleiner, Erez Hasman

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

We demonstrate a reflection-type sensor in the midinfrared spectra based on resonant excitation of surface phonon polaritons (SPhPs). In this range, SPhPs are characterized by the high density of states associated with slow surface waves that lead to enhanced resonance absorption. Delocalized SPhPs were excited by irradiating TM-polarized light on a one-dimensional grating embedded in a SiC substrate. The sensor response was characterized by changing the refractive index (RI) of a lossless CO2 gas. A detection limit of 2× 10-5 RI units was obtained at a wavelength of 11.9 μm.

Original languageEnglish
Article number111112
JournalApplied Physics Letters
Volume94
Issue number11
DOIs
StatePublished - 31 Mar 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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