TITLE

Slow surface phonon polaritons for sensing in the midinfrared spectrum

AUTHOR(S)
Balin, Igal; Dahan, Nir; Kleiner, Vladimir; Hasman, Erez
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/16/2009, Vol. 94 Issue 11, p111112
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
43230390

 

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