研究目的
The fabrication of nanoparticles of gold and silver with controlled sizes and density and the investigation of their optical properties for purposes of nanophotonics and nanoplasmonics.
研究成果
The variation of the thickness of as-grown gold and silver films permits controlling the plasmon nanoparticles size, enabling the retuning of the plasmon oscillation frequency. This advancement allows for the fabrication of highly effective optoelectronics devices based on surface plasmon resonance.
研究不足
The study focuses on the synthesis and optical properties of gold and silver nanoparticles, with potential limitations in the scalability of the pulsed laser deposition method for large-scale applications and the need for further optimization of nanoparticle size and density control.
1：Experimental Design and Method Selection:
The study employed the pulsed laser deposition method to synthesize gold and silver plasmon nanoparticles on c-sapphire and p-silica substrates. The variation of metal film thickness was achieved using a special device developed by the team.
2：Sample Selection and Data Sources:
Step thin films of gold and silver were fabricated on c-sapphire and p-Si (100) epi-ready substrates.
3：List of Experimental Equipment and Materials:
The study used a UV-visible spectrophotometer Cary-50 for transmission spectra measurement, scanning electronic microscopy (SEM) for morphology and size study, and atomic force microscopy (AFM) for size estimation on dielectric sapphire substrate.
4：Experimental Procedures and Operational Workflow:
The step films were heated to (700±2)°C to form nanoparticles through recondensation. The morphology and sizes were then analyzed.
5：Data Analysis Methods:
The transmission spectra were measured in the mode of subtraction of the substrate optical density to characterize the absorbing and scattering properties of the metal nanoparticles arrays.
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