Ultracompact metalens-based beam-focusing fiber-optic device with a large numerical aperture

Author:

Liu Yin1,Liao Qiming,Wang Yongtian,Li Xiaowei2ORCID,Huang LinglingORCID

Affiliation:

1. University of Science and Technology Beijing

2. School of Mechanical Engineering, Beijing Institute of Technology

Abstract

Conventional optical fibers have good light conduction and transmission properties, and have been widely used in the fields of long-distance fiber-optic communication and sensing. However, due to the dielectric properties of the fiber core and cladding materials, the spot size of the transmitted light is dispersive, which greatly limits the application areas of optical fiber. The emergence of metalenses based on artificial periodic micro-nanostructures is opening the door to a variety of fiber innovations. We demonstrate an ultracompact beam-focusing fiber-optic device based on a composite structure of a single-mode fiber (SMF), a multimode fiber (MMF), and a metalens consisting of periodic micro-nano silicon column structures. Convergent beams with numerical apertures (NAs) of up to 0.64@air and a focal length of 63.6 μm are produced by the metalens on the MMF end face. The metalens-based fiber-optic beam-focusing device could find new applications in optical imaging, particle capture and manipulation, sensing, and fiber lasers.

Funder

National Key Research and Development Program of China

Beijing Outstanding Young Talents

National Natural Science Foundation of China

China Postdoctoral Science Foundation

Fok Ying Tung Education Foundation

Beijing Municipal Science & Technology Commission, Administrative Commission of Zhongguancun Science Park

Open Funding of Guangxi Key Laboratory of Optoelectronic Information Processing

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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