Abstract

Microring resonators have been the fundamental building blocks of integrated photonic networks. They play key roles in a number of on-chip photonic elements, such as filters, modulators, switches, and sensors. However, the applications of microring resonators in these components are hindered by the evanescent coupling, which requires very precise position control and is hard to be realized in standard photolithography. Here, we demonstrate a novel, general, and robust mechanism to achieve microdisk-based end-fire injection and collection devices. Instead of coupling light via evanescent waves, here the light is injected into the cavity by connecting a waveguide and a deformed microdisk directly. The light on resonance can be reflected back and detected at the same waveguide, making the devices to be “easy come easy go.” The reflectance is as high as 95% and can be periodically obtained from the long-lived resonances with free spectral range around 18 nm. The proposed mechanism is found to be robust to cavity shape, refractive index, and waveguide width and all the parameters can be larger than 500 nm, making the designed devices to be easier realized by standard photolithography. We believe this research will boost the development of low-cost silicon photonic devices.

© 2015 IEEE

End-fire injection of light into high-Q silicon microdisks

Shuai Liu, Wenzhao Sun, Yujie Wang, Xiaoyi Yu, Ke Xu, Yongzhen Huang, Shumin Xiao, and Qinghai Song
Optica 5(5) 612-616 (2018)

Deformed microdisk coupled to a bus waveguide for applications in resonant filter

Qinghai Song, Shuai Liu, Zhiyuan Gu, Nan Zhang, and Shumin Xiao
Opt. Lett. 39(5) 1149-1152 (2014)

High-Q chaotic lithium niobate microdisk cavity

Li Wang, Cheng Wang, Jie Wang, Fang Bo, Mian Zhang, Qihuang Gong, Marko Lončar, and Yun-Feng Xiao
Opt. Lett. 43(12) 2917-2920 (2018)

Separatrix modes in weakly deformed microdisk cavities

Chang-Hwan Yi, Julius Kullig, Ji-Won Lee, Ji-Hwan Kim, Hyeon-Hye Yu, Jan Wiersig, and Chil-Min Kim
Opt. Express 25(7) 8048-8062 (2017)

The impact of emission mechanisms on the long-lived states around avoided resonance crossings in chaotic microcavity

Shuai Liu, Chao Zeng, Zhiyuan Gu, Kaiyang Wang, Nan Zhang, Shang Sun, Shumin Xiao, and Qinghai Song
Opt. Express 22(5) 5086-5097 (2014)