Diao Jia-Jie (刁佳杰)a, Chen Guang-De (陈光德)a, Xi Cong (席 聪)b, Z Y Fanc, Yuan Jin-She (苑进社)a
a Department of Applied Physics, Xi'an Jiaotong University,Xi'an 710049, China; b School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China; c Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601, USA
Abstract Metal-coated nanoshell, the nanoparticle consisting of a nanometre-scale dielectric core coated with a thin metallic shell, exhibits three distinct optical resonant forms, the sphere cavity resonance (SCR), plasmon resonance (PR), and concentric dielectric sphere resonance (CDSR). The SCR, PR and CDSR of the metal-coated nanoshell reveal a geometric tunability controlled by the core radius and by the ratio of the core radius to the total radius. Classical electrodynamics and Mie scattering theory are used to treat the resonant forms and the transition state between the resonant forms. Based on previous experimental research, we present a group of resonant equations for all the resonant forms, which depend on the geometric structure of the metal-coated nanoshell.
Received: 11 March 2002
Revised: 28 June 2002
Accepted manuscript online:
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