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Schematic of the structure of C-doped GaN based LA-PCSW.
Bias voltage dependence of dark current and photocurrent ( pulsed laser with ) for C-doped GaN based LA-PCSW.
Bias voltage dependence of square root of the radiation energy under pump energy of /pulse. The repetition rate pulse chopped with a rate giving rise to a pair of pulses in a window is clearly observed.
Pump power dependence of the radiation energy under bias voltage . Solid curve is the theoretical curve fitted to the data for GaN LA-PCSW.
Fourier-transformed amplitude spectrum of terahertz radiation pulse generated by GaN LA-PCSW. The inset is the amplitude of the measured terahertz pulse signal.
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