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End-fire Injection of Light into High-Q Silicon Microdisks

Posted on 2018-05-17 - 13:40
High quality (Q) factor silicon microdisks are promising platforms for the revolutionizing bio-sensing, medical diagnosis and frequency comb. Nevertheless, their practical applications are hindered by the regular waveguide-resonator coupling configuration, which relies on the sophisticated and high-cost nanofabrication. Here we demonstrate a simple, cost-effective, and counter-intuitive mechanism to couple light into a high-Q silicon microdisk. In contrast to the evanescent coupling, the incident light is injected into silicon microdisks through the waveguides directly connected to them. The end-fire injection coefficients and Q factors of waveguide connected microdisks (WCMs) are around 57% and 2×10⁵-7×10⁵, comparable to the conventional microdisks. Importantly, the end-fire injection configuration is quite robust to fabrication deviations and can be simply realized without using electron-beam lithography. Meanwhile, their applications in monitoring nanoparticles and tiny ambient changes have also been explored. This research will route a new way to on-chip biosensors and integrated photonic circuits.

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AUTHORS (8)

Qinghai Song
Shuai Liu
Wenzhao Sun
yujie wang
Yu Xiaoyi
Ke Xu
Yong-Zhen Huang
Shumin Xiao

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