Chinese Optics Letters, 2020, 18 (3): 030602, Published Online: Mar. 10, 2020  

Tunable fiber-tip lens based on thermo-optic effect of amorphous silicon Download: 740次

Author Affiliations
Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China
Abstract
We theoretically demonstrate a compact all-dielectric metasurface fiber-tip lens composed of sub-wavelength amorphous silicon on the end face of a multimode fiber. The full 2π phase control was realized by varying the widths of resonant units. The tunable focal length is achieved by using the thermal-optic effect of amorphous silicon. The focal length increases from 309 μm to 407 μm when the temperature changes by 300 K. The temperature controlled all-fiber integrated lens is compact and with high efficiency and provides an excellent platform of a fiber-tip lab. Meanwhile, the proposed fiber lens does not have any structural changes during dynamic tuning, which improves the durability and repeatability of the devices.

Ping Li, Jing Liu, Peng Huang, Xingyu Zhang, Jinhui Shi, Libo Yuan, Chunying Guan. Tunable fiber-tip lens based on thermo-optic effect of amorphous silicon[J]. Chinese Optics Letters, 2020, 18(3): 030602.

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