College of Engineering and Applied Sciences and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, China.
Opt Lett. 2011 Nov 15;36(22):4434-6. doi: 10.1364/OL.36.004434.
Electromagnetically induced transparency (EIT)-like transmission is observed in an electro-optic (EO) tunable periodically poled lithium niobate (PPLN) with a central defect. When an electric field is applied, light satisfying the phase matching condition keeps its original polarization, although it experiences polarization rotation then turns back. Therefore the corresponding light always may pass though freely but with an EO tunable phase and dispersion. On the other hand, light with a neighboring wavelength is blocked. An EIT-like spectrum is thus obtained with tunable group delay. A low-voltage bulk phase shifter with over two orders of magnitude larger index change is obtained.
电光（EO）可调谐周期极化铌酸锂（PPLN）中存在中心缺陷时，可观察到类电磁感应透明（EIT）传输。施加电场时，满足相位匹配条件的光保持其原始偏振状态，尽管它经历了偏振旋转然后又返回。因此，相应的光始终可以自由通过，但具有 EO 可调谐的相位和色散。另一方面，具有相邻波长的光被阻挡。因此，获得了具有可调群延迟的类 EIT 光谱。获得了具有超过两个数量级大得多的折射率变化的低压体相位调制器。
