Liu Yan, Yan Jing, Shao Yao, Pan Jie, Zhang Chunfu, Hao Yue, Han Genquan
Appl Opt. 2016 Mar 1;55(7):1720-4. doi: 10.1364/AO.55.001720.
We investigate the dispersion properties of an ultrathin spoof plasmonic waveguide based on metal strip grooves using the finite element method. The confinement ability of the surface plasmon polariton (SPP) waves are influenced by the dispersion curves, which can be modulated by the structure parameters. The propagation characteristics of a subwavelength planar plasmonic waveguide ring resonator have also been studied. Furthermore, a gain medium is introduced to compensate for the propagation loss of the SPP wave in the device at terahertz frequency. It is demonstrated that the gain medium provides an enhancement for the control of on/off states of the signal with the presence of pumping, which paves a way for gain-assisted switching and lasing applications in the terahertz regime.
我们使用有限元方法研究了基于金属条凹槽的超薄类表面等离子体激元波导的色散特性。表面等离激元极化激元（SPP）波的限制能力受色散曲线影响，而色散曲线可通过结构参数进行调制。还研究了亚波长平面等离子体激元波导环形谐振器的传播特性。此外，引入了增益介质以补偿太赫兹频率下该器件中SPP波的传播损耗。结果表明，增益介质在有泵浦的情况下为信号开/关状态的控制提供了增强作用，这为太赫兹波段的增益辅助开关和激光应用铺平了道路。
