Fig. 1. Schematic diagram of polarization direction in terahertz electro-optical detection

Fig. 2. ϕ0 versus α and β

Fig. 3. ϕ0 versus α under different β

Fig. 4. Schematics of polarization directions before and after optimization of detection structure. (a) Before optimization; (b) after optimization

Fig. 5. Diagram of experimental setup

Fig. 6. Normalized raw data measured by imaging spectrometer

Fig. 7. Measured results by imaging spectrometer. (a) Averaged terahertz pulse time-domain waveform; (b) RMS value of terahertz noise signal

Fig. 8. Scatter plot of signal-to-noise ratio of terahertz time-domain waveform

Fig. 9. Measured terahertz time-domain waveform and noise analysis based on imaging spectrometer. (a) Terahertz time-domain waveform based on single detection of imaging spectrometer; (b) recorded noise signals and RMS values over 100 shots