Emission of terahertz radiation from SiC

Strait, Jared H.; George, Paul A.; Dawlaty, Jahan; Shivaraman, Shriram; Chandrashekhar, Mvs; Rana, Farhan; Spencer, Michael G.
August 2009
Applied Physics Letters;8/3/2009, Vol. 95 Issue 5, p051912
Academic Journal
We report the emission of strong coherent broadband terahertz radiation from 6H-silicon-carbide (SiC) excited with optical pulses. The measured terahertz spectral signal-to-noise ratio is better than one thousand. We determine that the terahertz radiation is generated via second order optical nonlinearity (optical rectification). We present a measurement of the ratio of nonlinear susceptibility tensor elements χzzz(2)/χzxx(2) and the complex index of refraction of silicon carbide at terahertz frequencies.


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