Journal
OPTICS LETTERS
Volume 34, Issue 20, Pages 3068-3070Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.34.003068
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- University of California, Santa Barbara, National Science Foundation Materials Research Science and Engineering Center
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We report a terahertz (THz) photoconductive switch made from a composite of metal ErAs nanoparticles embedded in In(0.53)Ga(0.47)As 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 similar to 12 mu W 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. (C) 2009 Optical Society of America
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