基于相位调制的表面等离激元聚焦动态调控研究

We investigate an approach to dynamically manipulate focus of Surface Plasmon Polaritons based on the modulation of phase distribution of incident beam. By changing the phase distribution by a Spatial Light Modulator (SLM), we successfully realize dynamic control on the position of the focal point of SPP on the two-dimensional metallic surface,and theoretically analyse the mechanism of such manipulation. In addition, we use this approach to achieve dynamic control of coupling SPP focus to subwavelength waveguides, exhibiting its potential applications in integrated plamonic circuits devices.