研究目的
To propose and experimentally demonstrate a novel mechanism for nonlinear holographic metasurfaces using all-dielectric metasurfaces composed of C-shaped Si nanoantennas, aiming to reduce absorption loss and enhance third-harmonic generation (THG) signals.
研究成果
The research successfully demonstrates high-efficiency cyan and blue THG holograms from Si metasurfaces for the first time, showcasing the potential of all-dielectric metasurfaces in nonlinear optics. The double resonance mechanism in C-shaped Si nanoantennas significantly enhances the THG process and reduces absorption loss, paving the way for applications in anti-counterfeiting, banknote security, and high-density storage.
研究不足
The study is limited by the fabrication tolerance and the need to slightly detune the C-elements from their maximal positions to realize the designed phase shifts, which may affect the enhancement factor and conversion efficiency.
1：Experimental Design and Method Selection:
The study employs C-shaped Si nanoantennas as building blocks for the nonlinear metasurface. The design rationale is based on enhancing the THG process through fundamental resonance and redistributing THG signals via higher-order resonance to reduce absorption loss.
2：Sample Selection and Data Sources:
The metasurface is fabricated on a sapphire substrate using electron-beam lithography and inductively coupled plasma etching.
3：List of Experimental Equipment and Materials:
A home-built optical microscope and laser scanning microscope are used for characterization.
4：Experimental Procedures and Operational Workflow:
The THG measurements are performed by irradiating a femtosecond pulsed laser onto the metasurface and recording the signals with a spectrometer.
5：Data Analysis Methods:
The enhancement factor of THG signals is calculated by normalizing with a single crystal silicon film, and the conversion efficiency is estimated by calibrating the spectrum intensity.
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