Terahertz radiation due to random grating coupled surface plasmon polaritons

Details Terahertz radiation due to random grating coupled surface plasmon polaritons Terahertz radiation due to random grating coupled surface plasmon polaritons

2010-08-02

arxiv.org/abs/1008.0251v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

We report on terahertz (THz) radiation under electrical pumping from a degenerate semiconductor possessing an electron accumulation layer. In InN, the random grating formed by topographical defects provides high-efficiency coupling of surface plasmon polaritons supported by the accumulation layer to the THz emission. The principal emission band occupies the 2-6 THz spectral range. We establish a link between the shape of emission spectra and the structural factor of the random grating and show that the change of slope of power dependencies is characteristic for temperature-dependent plasmonic mechanisms. The super-linear rise of a THz emission intensity on applied electric power provides advantage of such materials in emission yield.

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