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Experimental setup. OPM: off-axis parabolic mirror. The inset shows the sample; pump light is incident along the direction.
(a) THz signals from injected currents directed along the direction for right-handed (solid line, ) and left-handed (dashed line, ) circularly polarized light. Dotted line: recorded signal for linearly polarized light. (b) Normalized power spectra of the THz pulses for pump polarization at three different intensities: (dotted line), (solid line), and (dashed line).
Amplitude of THz pulses as a function of pump intensity. Closed circles: experimental data, black line: linear fit to the first four data points, including origin.
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