Multipole Plasmon Resonances of Submicron Silver Particles

摘要

The hydrogen reduction method allows the synthesis of submicron Ag particles that exhibit unique optical properties, specifically the ability to optically excite high order modes of the plasmon resonance. The observation of these modes not only is of fundamental importance for understanding optical properties of plasmonic structures but also renders the potential for new practical applications. The latter stems from the properties of various plasmon modes to produce local fields with different energy distribution around the particles as well as to selectively absorb and scatter light in specific regions of the visible spectrum. These properties are unique for large plasmonic particles and cannot be found in molecular and semiconductor chromophores or small plasmonic particles.