电介质球腔体模式与金属表面模式的共振吸收

Resonant Absorption of Surface Plasmon Polaritons and Its Coupling with Cavity Mode

利用多重散射法对表面等离子激元模式和腔体本征模式,以及它们之间的耦合进行了详细的研究.研究结果表明:当二者之间的频率非常接近时,它们之间相互作用,在耦合频率附近可以产生非常强烈的吸收.通过调节体系中的某些参数,可以控制腔体本征模式和表面等离子激元出现的频率,从而使强吸收出现在所希望的频率上.详细地研究了介质小球的物理和几何参数对此共振吸收的影响.

The surface plasmon polaritons and its coupling with other electromagnetic modes are investigated by observing the absorption spectrum on a system of dielectric spheres periodically mounted in a metal substrate.The results showed that when the frequencies correspond to surface plasmon polaritons mode and cavity mode in the system are with almost the same,very strong absorbance dramatically appeared.By adjusting some parameters in the system,the frequency of coupling peak can be controlled.The relationships of resonance absorption with some physical and geometrical parameters are discussed in detail.