研究目的
Investigating the synergy of photothermal energy and optical forces generated by tightly focused laser beams to transform the shape of gold nanoparticles and tune their plasmonic properties.
研究成果
The combination of photothermal energy and optical forces induced by a tightly focused laser beam provides a facile route to optically tailor plasmonic properties of nanoparticles. This work also offers insight into how optical forces interact with plasmonic NPs, potentially experiencing a quantum plasmonic regime.
研究不足
The technique's effectiveness is limited by the laser power applied, which determines the temperature of Au NPs, affecting the viscosity and surface tensions of the particles as well as the substrate. The process also depends on the surface energy of the substrate.
1：Experimental Design and Method Selection:
A 446 nm continuous wave (CW) laser is applied to irradiate Au NPs situated on a Si substrate to observe modifications on the particles' shape from spheres to rods and to dimers.
2：Sample Selection and Data Sources:
80 nm AuNPs (5% monodispersity, BBI solutions) were deposited on Si substrates by drop-casting.
3：List of Experimental Equipment and Materials:
Customized dark-field microscope including a laser for particle irradiation, SEM (Zeiss) for characterizations.
4：Experimental Procedures and Operational Workflow:
The laser beam is focused onto the particle through a 100× dark-field objective to generate a diffraction-limited spot. White light scattering spectra were recorded confocally with a fiber-coupled spectrometer.
5：Data Analysis Methods:
Simulations of the temperature distribution around the irradiated Au NP and optical force simulations were performed using COMSOL.
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