Publications

THz emission from coherent plasmons in InAs nanowires

Seletskiy, D.V.; Hasselbeck, M.P.; Sheik-Bahae, M.; Cederberg, Jeffrey G.; Talin, A.A.

We report the first observation of coherent plasmon emission of THz radiation from arrays of semiconductor nanowires. The THz signal strength from InAs nanowires is comparable to a planar substrate, indicating the nanowires are highly efficient emitters. This is explained by the preferential orientation of plasma motion to the wire surface, which overcomes radiation trapping by total-internal reflection. Using a bulk Drude model, we identify the average donor density and mobility in the nanowires in a non-contact manner. Contact IV transconductance measurements provide order of magnitude agreement with values obtained from the THz spectra. © 2009 SPIE.