Zhao Wenjuan, Qi Jiwei, Lu Yao, Wang Ride, Zhang Qi, Xiong Hao, Zhang Yaqing, Wu Qiang, Xu Jingjun
Opt Express. 2019 Mar 4;27(5):7373-7383. doi: 10.1364/OE.27.007373.
We experimentally demonstrate on-chip plasmon-induced transparency at THz frequencies using a meta-structure deposited on a 50 μm-thick dielectric subwavelength waveguide. The obvious plasmon-induced transparency results from strong coupling between the respective modes of a cut wire and a double-gap split ring resonator. The simulation and experimental results are consistent. Based on our numerical simulations of the temporal evolution of plasmon-induced transparency, a π/2 phase difference at the transparency peak between the above two modes is observed, i.e., there is energy oscillating between them that exhibits Rabi oscillation-like behavior. In addition, at the transparency peak, a strong local-field enhancement effect and high transmission can be obtained simultaneously, which can be tuned by changing the separation between the cut wire and the double-gap split ring resonator. These results will facilitate the design of THz integrated photonic devices and serve as an excellent platform for nonlinear optics and sensing.
我们通过在50μm厚的介质亚波长波导上沉积一种超材料结构，在太赫兹频率下通过实验证明了片上等离子体诱导透明现象。明显的等离子体诱导透明是由切割线和双间隙分裂环谐振器各自模式之间的强耦合引起的。模拟和实验结果一致。基于我们对等离激元诱导透明时间演化的数值模拟，观察到上述两种模式在透明峰处存在π/2的相位差，即它们之间存在能量振荡，呈现出类似拉比振荡的行为。此外，在透明峰处，可以同时获得强的局域场增强效应和高透射率，这可以通过改变切割线与双间隙分裂环谐振器之间的间距来调节。这些结果将有助于太赫兹集成光子器件的设计，并为非线性光学和传感提供一个优秀的平台。
