期刊
APPLIED PHYSICS LETTERS
卷 94, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3098360
关键词
electronic density of states; infrared spectra; optical sensors; polaritons; refractive index; refractive index measurement; silicon compounds; surface phonons; surface plasmon resonance; wide band gap semiconductors
资金
- Israel Science Foundation
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 CO(2) gas. A detection limit of 2x10(-5) RI units was obtained at a wavelength of 11.9 mu m.
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