研究目的
Investigating the intensity and polarization dependence of high order harmonic generation (HHG) in polycrystalline single layers of MoS2 and WS2.
研究成果
The study revealed distinct qualitative features of HHG in 2D materials, with WS2 showing more efficient HHG up to the 16th-order harmonic compared to MoS2. The intensity and ellipticity dependence of HHG were qualitatively similar for all samples, indicating a non-perturbative character of the generation process. The findings suggest that despite similar crystal symmetry and electronic structure, the HHG mechanisms in WS2 and MoS2 can differ significantly.
研究不足
The study is limited to polycrystalline single layers of MoS2 and WS2, and the results may not be directly applicable to other 2D materials or different synthesis methods.
1：Experimental Design and Method Selection:
The study involved a comparative analysis of HHG in MoS2 and WS2 monolayers using mid-IR femtosecond laser pulses.
2：Sample Selection and Data Sources:
MoS2 and WS2 monolayers were synthesized by chemical vapor deposition (CVD) on c-plane sapphire substrates.
3：List of Experimental Equipment and Materials:
A homebuilt KTA-based OPA delivering mid-IR pulses at
4：75μm wavelength with sub 100 fs duration and up to 60 μJ of energy was used. Experimental Procedures and Operational Workflow:
The laser beam was focused on the monolayers through the substrate, and the spectral dependence of HHG was analyzed as a function of laser pulse intensity, polarization, and angle of incidence.
5：Data Analysis Methods:
The harmonic spectra were compared between WS2 and MoS2, and the dependence of harmonic signal on driving field ellipticity was analyzed.
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