A Fiber-Attached Coupler for Transmission Bandpass Whispering Gallery Mode Resonator
A Fiber-Attached Coupler for Transmission Bandpass Whispering Gallery Mode Resonator
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用于传输带通回音壁模式谐振器的光纤耦合器
DOI：
10.1109/jlt.2021.3052872
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发表时间：
2021-04
影响因子：
4.7
通讯作者：
Tao Zhu
中科院分区：
文献类型：
--
作者：
Leilei Shi;Qianqian Wang;Tao Zhu
提出了一种用于传输带通回音廊模谐振器的光纤附加耦合器，并进行了实验验证。利用飞秒激光烧蚀制作的耦合器由一对曲率半径为50μm的曲波导所组成，分别通过逝去场耦合激发和收集WGM场。作为概念验证，将作为WGM腔的聚合物微球嵌入到两个弯曲波导之间的飞秒激光烧蚀孔中。当微球被空气包围时，观察到半高宽度为0.15 nm的通带，验证了所提出的耦合器用于构建基于WGM腔的传输窄带通光纤滤光片的可行性。利用相对较高的热光系数，封装传输带通WGM谐振器的通带可以进行热光调谐，灵敏度为446.6 pm/°C。
A fiber attached coupler for transmission bandpass whispering gallery mode (WGM) resonator is proposed and experimentally demonstrated. The coupler fabricated by femtosecond laser ablation consists of a pair of curved waveguides with a curvature radius of 50 μm, by which the WGM field is excited and collected through evanescent field coupling, respectively. As a proof of concept, a polymer microsphere functioning as the WGM cavity is embedded into a femtosecond laser ablated hole between the two curved waveguides. A passband with a full width of 0.15 nm at half maximum is observed when the microsphere is surrounded by air, verifying the feasibility of the proposed coupler for constructing a WGM cavity-based transmission narrow bandpass optical fiber filter. Benefitting from the relatively high thermo-optical coefficient, the passband of a packaged transmission bandpass WGM resonator can be thermo-optically tuned with a sensitivity of 446.6 pm/°C.
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