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(a) Square spiral antenna and PC switch. (b) Equivalent large-signal model.
Average THz power vs optical pump power and bias voltage. Data fit (solid lines) and extrapolated (dotted lines) using large-signal model.
(a) Effect of optical power and bias voltage on conversion efficiency, with measured points and modeled curves. (b) Average THz power vs pulse width, showing experimental point and large-signal model.
Power spectra parameterized by bias voltage. Spot frequency measurements are shown by the dark circles. FTIR spectrometer is shown as continuous data at 120 V (topmost trace), 100, 80, 60, 40, and 20 V bias and noise floor (bottom) is below. The spot-frequency data is offset above the FTIR data only for clarity.
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