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Current vs voltage characteristics of the PC antennas made on the LTG under various excitations at . The open and filled symbols correspond to and 0.45, respectively. The lines are guides for the eye.
Amplitude spectra of the terahertz waves emitted from the antennas of (thin curve) and of (thick curve) with the conditions denoted in the figure. The broken curve depicts the spectrum without terahertz emission showing the noise level of the detector (LTG GaAs antenna excited at ). Shown in the inset is the time domain trace corresponding to the spectrum of the antenna.
Peak (filled circles) and noise (open circles) amplitude of the terahertz spectra emitted from the antenna as functions of the (a) excitation power and (b) bias voltage. The bias voltage was in (a) and the excitation power was in (b). The square symbols show the corresponding values of the antenna. The broken lines indicate the detector noise level.
Amplitude spectra of the terahertz signals emitted from and detected by the antennas excited at . The excitation was 5 and for the emitter and detector, respectively. Though the vertical axis is given in arbitrary units, the scale is the same as that in Fig. 2 so that the spectra can be compared. The broken curve shows the noise level of the detector, which was obtained without excitation for the emitter. Depicted in the inset is the time domain trace for the bias case.
Characteristics of the InGaAs layers used in this work.
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