研究目的
Investigating the synchronous degenerate and nondegenerate two-photon absorption in 2D semiconducting monolayers using femtosecond laser pump-probe technique.
研究成果
The study successfully decoupled and measured degenerate and nondegenerate TPA coefficients in WS2 and MoSe2 monolayers, revealing their dependence on pump irradiance and the role of excitonic resonance. These findings are crucial for applications in nonlinear optics and photonics.
研究不足
The study is limited to WS2 and MoSe2 monolayers under specific pumping conditions. The technique's applicability to other 2D materials and under different conditions remains to be explored.
1：Experimental Design and Method Selection:
Femtosecond laser pump-probe technique was used to synchronously induce and temporally resolve degenerate and nondegenerate TPA in WS2 and MoSe2 monolayers.
2：Sample Selection and Data Sources:
Mechanically exfoliated WS2 and MoSe2 monolayers from bulk crystals were used.
3：List of Experimental Equipment and Materials:
Femtosecond laser system, optical microscope, spectrometer, beta barium borate (BBO) crystal for sum frequency generation (SFG).
4：Experimental Procedures and Operational Workflow:
Pump and probe pulses were temporally scanned to observe differential transmission signals.
5：Data Analysis Methods:
Temporal cross-correlation of pump and probe pulses was used to decouple nondegenerate and degenerate TPA signals.
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