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Abstract
The shaker modulation technique is demonstrated for ultrabroadband detection of terahertz (THz) radiation with a low-temperature-grown GaAs photoconductive (PC) antenna gated with 15 fs laser pulses. The differentiation of the time-resolved waveforms with the shaker modulation is advantageous to enhance the high-frequency components of the detected radiation without degrading the signal-to-noise ratio (SNR) because the PC response function determined by the temporal profile of the gating carrier number rapidly decreases with the increase in frequency. With the quantitative comparison of SNR between PC and electro-optic detection, the PC detection of radiation with the shaker modulation technique is promising for further spectroscopic application. The detection of radiation up to 60 THz is demonstrated.
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