研究目的
Investigating the light-induced coalescence of plasmonic dimers and clusters to understand the dynamics of nanoparticle reshaping and bridging under laser irradiation.
研究成果
The study reveals three distinct processes during laser-induced coalescence of nanoparticle dimers and clusters: facet growth, formation of a conductive bridge, and bridge growth. A strong correlation between initial and final spectral modes indicates a link between initial contact geometry and bridge width. The ability to digitally trigger coalescence in nanoparticle clusters opens possibilities for controlling electronic and optoelectronic devices.
研究不足
The study is limited to gold nanoparticles and their dimers/clusters. The process is specific to the conditions of laser irradiation and may not be directly applicable to other materials or conditions without further research.
1：Experimental Design and Method Selection:
The study uses time-course dark-field micro-spectroscopy to observe the reshaping of nanoparticle dimers under laser irradiation. Electromagnetic simulations are employed to confirm growth dynamics and measure bridge diameters.
2：Sample Selection and Data Sources:
Gold nanoparticle dimers and clusters are prepared by triggering and then quenching the aggregation of colloidal gold NPs. The aggregation is monitored using extinction spectroscopy and quenched with agarose.
3：List of Experimental Equipment and Materials:
A custom-built dark-field microscope with confocal fiber spectral collection, a white light laser for illumination, and a Leica 63× 1.2NA water immersion objective are used. Spectra are taken using a fibre-coupled and a cooled Ocean Optics spectrometer.
4：2NA water immersion objective are used. Spectra are taken using a fibre-coupled and a cooled Ocean Optics spectrometer.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The AuNP dimers are irradiated with a 404 nm laser focused onto the junction. The laser power is ramped, and spectra are taken with an integration time of 100 ms.
5：Data Analysis Methods:
The electromagnetic response of the dimer geometries is simulated by three-dimensional finite-difference time-domain (FDTD) calculations using Lumerical FDTD Solutions.
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