Abstract

We report a terahertz (THz) photoconductive switch made from a composite of metal ErAs nanoparticles embedded in In0.53Ga0.47As and coupled to a square spiral antenna. The THz output power was measured in a 77 K cryostat by using a standard hyperhemisphere-lens package, a Golay cell outside the cryostat, and a quasi-optical filter bank for spot frequency spectral measurements. Results indicate an average output power of ∼12 μW at 22 V bias using 140 mW of optical pump power from a subpicosecond fiber mode-locked laser. In addition, the THz spectra displayed invariance to bias voltage despite operating near impact ionization.

© 2009 Optical Society of America

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