Study of surface plasmon resonance for metallic nanoshells

• Main Authors: Hung-Yi Chung, 鍾弘毅
• Other Authors: Din Ping Tsai
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/77533936851894216945

博士 === 臺灣大學 === 物理研究所 === 98 === First of all, we present an approach alternative to the hybridization model for the treatment of the coupled interfacial plasmon modes in metallic nanoshells. Rather than formulating the problem form the Lagrangian dynamics of the free electronic fluid, we adopt an effective medium approach together with the uniqueness of the solutions to electromagnetic boundary value problem, from which the polarizability of the shells can then be systematically and efficiently derived; and the resonance frequencies for the coupled modes can be obtained from the poles in the polarizability. Secondly, by using this effective medium theory we study the modified dipole-dipole interaction between the molecules in the vicinity of a spheroidal metallic nanoshell. From which huge enhancement of the energy transfer rate is obtained due to the resonant excitation of the bounding and anti-bounding plasmonic modes of the nanoshell. Finally, we study the optical properties of a metallic nanoshell composite with particular focus on the effects of variation in temperature and particle clustering on these properties. One unique result from our modeling is the persistent manifestation of the single-particle resonances of the individual nanoshells which cannot be found in a composite of solid particles.