Cheng Ziwei, Dong Jianji, Zhang Xinliang
Opt Lett. 2020 Apr 15;45(8):2363-2366. doi: 10.1364/OL.383250.
We propose and theoretically analyze a generalized four-port waveguide-cavity system with a novel, to the best of our knowledge, semisymmetric Fano structure. By applying the system to a silicon-based photonic crystal nanobeam cavity (PCNC), we experimentally demonstrate an ultracompact crossbar optical switch with high drop port transmission. A low insertion loss of 1.5 dB in the drop port at the cross state is achieved comparing to the 8.5 dB insertion loss in a traditional non-Fano structure. The device is also benefited by the high quality factor and small mode volume for efficient switching and the ultracompact footprint of $ 14;\unicode{x00B5} {{\rm m}^2} $14µm in the core structure. The proposed PCNC switch shows great potential in various optical systems on chip to increase the integration and reduce energy consumption.
我们提出并从理论上分析了一种广义的四端口波导-腔系统，据我们所知，该系统具有一种新颖的半对称法诺结构。通过将该系统应用于基于硅的光子晶体纳米光束腔（PCNC），我们通过实验展示了一种具有高下路端口传输率的超紧凑型交叉开关。与传统非法诺结构中8.5 dB的插入损耗相比，交叉状态下下路端口实现了1.5 dB的低插入损耗。该器件还受益于高品质因数和小模式体积，以实现高效开关，并且核心结构的超紧凑占地面积仅为14平方微米。所提出的PCNC开关在各种片上光学系统中显示出巨大潜力，可提高集成度并降低能耗。
