研究目的
Investigating the collective optical modes and near-field properties in honeycomb plasmonic lattices composed of silver nanospheres, focusing on the role of dipole-only interactions between non-equivalent triangular sublattices.
研究成果
The study demonstrates that dipolar interactions dominate the collective response of honeycomb plasmonic lattices, leading to asymmetric field distributions within the unit cell. The transition between non-Bravais and Bravais lattices is shown to modify the lattice's optical response, highlighting the importance of intersublattice interactions in tailoring plasmonic lattice properties.
研究不足
The presence of defects in the lattice and not-perfectly spherical shape of the nanoparticles may affect the optical properties. The study is limited to dipolar interactions, with quadrupole effects considered negligible due to large detuning.
1：Experimental Design and Method Selection:
Fabrication of honeycomb plasmonic lattices using nanosphere lithography, followed by thermal evaporation of Ag and annealing to achieve quasi-spherical nanoparticles. Optical characterization using spectrophotometry and numerical simulations.
2：Sample Selection and Data Sources:
Honeycomb lattices composed of silver nanospheres fabricated on silica substrates, with optical properties measured using a Jasco V670 dual-beam spectrophotometer.
3：List of Experimental Equipment and Materials:
Polystyrene nanospheres, silver for thermal evaporation, silica substrates, Jasco V670 spectrophotometer, SEM for imaging.
4：Experimental Procedures and Operational Workflow:
Deposition of colloidal nanospheres, Ag evaporation, mechanical removal of nanospheres, thermal annealing, silica sputtering, optical measurements.
5：Data Analysis Methods:
Comparison of experimental data with numerical simulations and analytical calculations based on the generalized spectral representation method.
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