Wenhui FAN, Hui YAN, Xiaoqiang JIANG, Longchao CHEN, Zhuanping ZHENG, Jia LIU, Hui LI, Ling DING, Chao SONG. Ultrafast Terahertz Characteristic Spectroscopy Based on Femtosecond Laser and Its Application（Invited）[J]. Acta Photonica Sinica, 2022, 51(7): 0751403
- Acta Photonica Sinica
- Vol. 51, Issue 7, 0751403 (2022)
Fig. 1. The classification of typical THz emitters
Fig. 2. The classification of typical THz detectors
Fig. 3. Schematic of THz radiation from a THz-PCA excited by femtosecond pump laser
Fig. 4. The simulated time-domain characteristics of the carrier density corresponding to different peak powers of pump laser（G0 = 1 × 1016 cm-3，1 × 1017 cm-3 and 1 × 1018 cm-3）
Fig. 5. The simulated time-domain characteristics of the carrier density under different pulse durations of pump laser（δt = 25 fs，50 fs，and 100 fs）
Fig. 6. The simulated time-domain characteristics of the carrier density under different carrier life-times（τc = 0.5 ps，1 ps，and 2 ps）
Fig. 7. The calculated time-domain characteristics of photocurrent density under different carrier life-times（τc = 0.5 ps，1 ps，and 2 ps）
Fig. 8. The calculated time-domain characteristics of current density under different pulse durations of pump laser（δt = 25 fs，50 fs，and 100 fs）
Fig. 9. The simulated time-domain profile of transient photocurrent under different peak powers of pump laser（G0 = 1 × 1016 cm-3，1 × 1017 cm-3 and 1 × 1018 cm-3）
Fig. 10. The relationship between the peak amplitude of THz radiation and the carrier life-time of photoconductor（τc = 0.5 ps，1 ps，and 2 ps）
Fig. 11. The relationship between the peak amplitude of THz radiation and the pulse durations of pump laser（δt = 25 fs，50 fs，and 100 fs）
Fig. 12. The relationship between the peak amplitude of THz radiation and the peak pump laser power corresponding to the peak carrier generation rate（G0 = 1 × 1016 cm-3，1 × 1017 cm-3 and 1 × 1018 cm-3）
Fig. 13. Schematic of coherent detection on THz waves by THz-PCA
Fig. 14. The relationship between the surface photoconductivity of THz-PCA detector and the pulse duration of probe laser（τp = 10 fs，15 fs，25 fs，50 fs，and 100 fs）
Fig. 15. The relationship between the detected THz signals and the pulse duration of probe laser（τpd = 10 fs，15 fs，25 fs，50 fs，and 100 fs）and the red curve is the received THz signal
Fig. 16. The relationship between the surface photoconductivity of THz-PCA detector and the carrier life-time（τc = 0.1 ps，0.5 ps，1.0 ps，2.0 ps，and 3.0 ps）
Fig. 17. The relationship between the detected THz signals and the carrier life-times（τc = 0.1 ps，0.2 ps，0.5 ps，1.0 ps，and 2.0 ps）and the red curve is the received THz signal
Fig. 18. The THz-PCA incorporated with plasmonic nanostructures
Fig. 19. The simulation of THz-PCA without and with injury
Fig. 20. The view of home-made THz-PCAs
Fig. 21. The experimental results of our designed THz-PCA
Fig. 22. The optical transmission and the electric field distributions in the photoconductor
Fig. 23. The optical transmission and the schematic of designed THz-PCA with adhesion layer
Fig. 24. The schematic and simulation results of designed THz-PCA
Fig. 25. Schematic diagram of typical THz-TDS system
Fig. 26. THz spectra of amino acids and nucleobases
Fig. 27. THz spectra of saccharides
Fig. 28. Molecular structures，THz spectra of organic acids and their salts
Fig. 29. THz spectra of benzenediols comparing with calculated THz spectra
Fig. 30. THz spectral analysis of glucose anhydrate and monohydrate mixtures
Fig. 31. Schematic diagram of analysis process for multi-component mixtures by machine learning
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Table 0. The typical photoconductive materials
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Table 0. The Summary of conventional THz-PCAs
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Table 0. The development of THz-PCA incorporated with all-dielectric nanostructures
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Table 0. The development of THz-PCA incorporated with plasmonic nanostructures
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