Fig. 2: Strong dependence of THz emission on laser polarization. | Nature Communications

Fig. 2: Strong dependence of THz emission on laser polarization.

From: Antiferromagnet-topological insulator heterostructure for polarization-controllable terahertz generation

Fig. 2

THz emission waveforms a for various laser polarization directions \(\theta\) and corresponding FFT spectra b. θ = 0° corresponds to the y-axis. “+” and “−” signs: peaks and dips of the time-___domain THz waves, respectively. Numbers 1-3: frequency ___domain peaks. c The amplitude of the THz electric-field signal as a function of θ. Green and purple markers represent the data at 2.6 ps and 3.3 ps cut in a, respectively. d Waveforms of the THz emission under different laser polarization states. Red, blue and purple solid lines represent THz emission signals under left-handed, right-handed and linear laser polarization excitation, respectively. e The peak value of THz electric field as a function of the pump fluence. The solid red line is a linear fit of the data with intercept at zero.

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