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Fig. 1. The schematic diagram of the experimental setup for the EODCP of the terahertz field pulse with a spectrometer equipped with a CCD image sensor. A double-beam configuration was employed to obtain the probe pulses with modulation due to the terahertz field and without it simultaneously. ITO is indium tin oxide. First citation in article

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Fig. 2. (a) The terahertz field waveforms obtained by EODCP at five delay times between the input terahertz field and chirped probe pulses, at a chirp rate of −0.24  THz². The ordinate of each waveform is shifted for the sake of clarity. (b) Corresponding peak positions [arrow in (a)] in the terahertz waveform, represented by frequency, plotted as a function of the delay time (open squares). The chirp rate is obtained from the slope of the solid line fitted to the data. The upper abscissa is derived from the lower one using the chirp rate value in (a). (c) The waveform obtained by EODCP (black line) at −0.24  THz² is compared with that obtained by THz-TDS (thick gray line). First citation in article

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Fig. 3. Terahertz field waveforms obtained by EODCP at five delay times, at a chirp rate of −1.3  THz². The ordinate of each waveform is shifted for the sake of clarity. The upper abscissa is derived from the lower one using the chirp rate value. First citation in article

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Fig. 4. The terahertz field waveforms calculated from Eq. (4) at three delay times and a chirp rate of −0.24  THz², where T_c=22  ps, T=0.45  ps, and ₀=375  THz. The ordinate of each waveform is shifted for the sake of clarity. The original terahertz field waveform, E_THz(t) in Eq. (1), is depicted in the inset. The values of T and ₀ are fixed for the calculations below. First citation in article

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Fig. 5. Chirp rate dependence of the terahertz field waveform calculated from Eq. (4), where [a(THz²),T_c(ps)]=(−0.12,22), (−0.65,4), and (−1.5,1.8), with =0  ps. The chirp rate value is given by 2a. The ordinate of each waveform is shifted for the sake of clarity. First citation in article

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Fig. 6. (a) Terahertz field waveforms measured by EODCP at two spectral resolutions of the spectrometer [0.2 nm (black line) and 3 nm (thick gray line)] at a chirp rate of −1.9  THz². (b) Frequency spectra obtained from the Fourier transforms of the two terahertz field waveforms, together with that obtained by THz-TDS. A logarithmic scale is used for the ordinate. First citation in article

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Fig. 7. Terahertz field waveform calculated from Eq. (3) through numerical integration of Eq. (2) at a chirp rate of −0.24  THz², where the -function and Gaussian functions with widths of 0.2, 0.6, and 3.4 nm are used for g(−). The ordinate of each waveform is shifted for the sake of clarity. First citation in article

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Fig. 8. Frequency spectra obtained from the Fourier transform of the terahertz field waveform calculated from Eq. (4) at a chirp rate of −0.24  THz² (black line) and the original waveform (thick gray line). The frequency spectrum obtained by EODCP (experiment) at −0.24  THz² is plotted, where the ordinate is shifted for the sake of clarity. A logarithmic scale is used for the ordinate. First citation in article