研究目的
Investigating the potential of lithium niobate metasurfaces for second-harmonic generation.
研究成果
The results demonstrate that resonant metasurfaces based on lithium niobate are suitable for second-harmonic generation, with potential applications across a wide spectral range from UV to mid-IR.
研究不足
The study is limited by the fabrication techniques and the spectral range of the laser used for excitation.
1:Experimental Design and Method Selection:
The study involved designing and fabricating a nonlinear metasurface with Mie-type resonances. Theoretical models were used to simulate the transmission spectrum and identify resonances.
2:Sample Selection and Data Sources:
A periodic array of LN nanocubes on an SiO2 substrate was fabricated using focused ion beam milling.
3:List of Experimental Equipment and Materials:
Focused ion beam milling (FIB) for fabrication, short-pulsed laser for excitation, EMCCD camera for imaging.
4:Experimental Procedures and Operational Workflow:
The sample was characterized by transmission spectroscopy and second-harmonic generation was observed by exciting the metasurface with a laser and analyzing the SH intensity distribution.
5:Data Analysis Methods:
The spatial composition of the generated second harmonic was analyzed by imaging the back-focal plane of the collecting objective.
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