应用表面等离激元控制太赫兹偏振态

项目名称： 应用表面等离激元控制太赫兹偏振态

项目编号： No.61205098

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 路鑫超

作者单位： 中国科学院微电子研究所

项目金额： 28万元

中文摘要： 表面等离激元可以突破衍射极限，在亚波长尺度产生极强局域场。人们已经对表面等离激元引起的场增强进行大量研究。表面等离激元产生的场相位变化可以用来控制入射场的传播方向及偏振态，也具有重要研究价值。由于可见光波段缺乏直接探测相位变化的实验手段，目前对于相位的研究比较欠缺。在前期研究中，项目申请人已经证实太赫兹波段表面等离激元可以引起入射场相位改变，并推测其可以控制太赫兹场偏振态。本项目将使用太赫兹时域光谱系统，直接探测入射场与表面等离激元相互作用后的相位变化，研究表面等离激元控制相位变化的物理机制，设计出可以调节入射场相位变化的太赫兹四分之一波片，在一定频率范围内控制太赫兹场的偏振态。本课题的研究内容- - 太赫兹表面等离激元导致相位改变-目前在国内外尚无报道，该研究有助于实现集成器件小型化，并对可见光波段表面等离激元相关研究具有指导意义。

中文关键词： 表面等离激元；透射场增强；透射场相位变化；太赫兹四分之一波片；

英文摘要： Surface plasmons have attracted numerous interests in recent years. Both the breakthrough of diffraction limit and field enhancement make surface plasmons competitive for their potential applications in near-field microscopy and integrated photonic devices.Researchers have carried out in-depth investigations on the field enhancement brought by surface plasmons. However, there is still a lack of studies on phase shift induced by surface plasmons, which is limited by the absence of phase detection at optical frequencies.We have observed the phase shift around the surface plasmon resonance at terahertz frequencies. By employing Terahertz Time Domain Spectroscopy (THz-TDS), we can easily detect the phase shift after the incident terahertz wave interacts with the surface plasmons.The surface plasmons induced phase shift can control the propagation direction of the terahertz beam as well as its polarization. By investigating the physical mechanism on how surface plasmons tailor phase shift, the plasmonic quanter wave plate for controlling the polarization of the terahertz wave within certain frequency bandwidth will be designed. This study on phase shift introduced by terahertz surface plasmons has not been reported yet. The proposed research will prospect the applications in the miniature integrated devices. Also, t

英文关键词： Surface Plasmon Polaritons；Enhanced Transmission；Phase Shift of Transmission；Terahertz Quarter Waveplate；