研究目的
To predict the near field maps of finite metallic nanoparticles (MNP) of canonical geometries using a simple hand calculation method based on group theory and validate the approach experimentally.
研究成果
Group theory offers a simple and fast method to predict plasmonic hot spot distributions in particles of both finite and infinite symmetry, validated by experimental PEEM microscopy. The approach is general and can be extended to higher order plasmonic modes and complex excitation light waves.
研究不足
The method's precision depends on the mesh step size for particles of infinite symmetry. The dynamic range of PEEM detection may limit the observation of all hot spots.
1：Experimental Design and Method Selection:
The study employs group theory to predict plasmonic responses and validates predictions using photoemission electron microscopy (PEEM).
2：Sample Selection and Data Sources:
Au colloidal particles of various shapes (hexagon, disk, sphere) are used. Samples are prepared via chemical reduction of hydrogen tetrachloroaurate (III) hydrate in aqueous solution.
3：List of Experimental Equipment and Materials:
PEEM (Elmitec SPELEEM III), optical parametric oscillator (Chameleon OPO, Coherent Inc.), mode-locked Ti:sapphire oscillator (Chameleon Ultra II, Coherent Inc.), and various chemicals for nanoparticle synthesis.
4：Experimental Procedures and Operational Workflow:
Nanoparticles are excited at grazing incidence with a laser beam, and near-field maps are acquired using PEEM. The polarization of the laser beam is adjusted to selectively excite plasmon modes.
5：Data Analysis Methods:
The distribution of hot spots is analyzed based on the symmetry of the particles and the exciting electric field, using group theory to interpret the results.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
