Author Affiliations
1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China2School of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, Zhejiang, China3College of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, Chinashow less
Fig. 1. The photoconductive antenna generating terahertz wave
Fig. 2. Optical rectification generating terahertz wave
Fig. 3. Titled-pulse-front pump technique
Fig. 4. PCS-DSTMS crystals generating terahertz waves
[49] Fig. 5. Difference frequency of DSTMS crystals generating terahertz wave
[64] Fig. 6. Two-color field laser filaments generating terahertz waves
[75] Fig. 7. Liquid water film generating terahertz wave
[13] Fig. 8. Laser-solid target generating terahertz wave
Fig. 9. Mechanism of matter controlling of using high-filed terahertz wave
[86]. (a) High-field terahertz pulse; (b) vibration rotation,spin precession, and electron acceleration; (c) scheme diagram of time-resolved spectroscopy of high-field THz pump-optical probe
Fig. 10. Hot carrier extraction process in SnO
2/Sb
2Se
3 and CdS/Sb
2Se
3 heterojunctions
[110]. (a) Time-dependent photoinduced terahertz conductivity of Sb
2Se
3 with CdS and SnO
2 buffer layers; (b)(c) band diagrams of SnO
2/Sb
2Se
3 and CdS/Sb
2Se
3; (d) ultrafast time-dependent scattering time of SnO
2/Sb
2Se
3 and CdS/Sb
2Se
3; (e) decay time-dependent
C parameter of SnO
2/Sb
2Se
3 and CdS/Sb
2Se
3 Fig. 11. Schematic diagram of femtosecond laser-induced topological insulator surface radiating broadband terahertz waves of different polarization directions
[117], where
Ex is the displacement current radiation spectrum, and
Eyz is the depletion current radiation terahertz spectrum
Fig. 12. Terahertz radiation enhancement induced by drift current amplification in WSe
2/Si heterojunctions
[121]. (a)‒(b) Time-domain spectroscopy of terahertz pulses generated from WSe
2/Si, Si, and monolayer WSe
2 upon excitation with different pump photon energies; (c) schematic illustration of the depletion field-accelerated charge transfer
Fig. 13. Polaron terahertz radiation in FAPbI
3[125]. (a) Terahertz radiation induced by femtosecond laser in FAPbI
3; (b) the process of non-equilibrium photocurrent coupling with the lattice anharmonic vibration to radiate terahertz waves at corresponding frequencies (P1 and P2 are the emission modes of the polaron); (c) the sub-band structure of FAPbI
3; (d) wavelength-dependent change in coupled radiation intensity