Dynamically controlled nanofocusing metalens based on graphene-loaded aperiodic silica grating arrays

Author:

Lu Liu1ORCID,Wang Chenyang1,Ngiejungbwen Looh Augustine1,Zhang Liang1,Zhao Tiantian1,Chen Daifen2,Ren Xifeng3ORCID

Affiliation:

1. Jiangsu University

2. Jiangsu University of Science and Technology

3. University of Science and Technology of China

Abstract

A new plasmonic nanofocusing metalens based on aperiodic silica grating arrays was designed and investigated. Assisted by the graphene surface plasmon, the infrared polarized light can be focused in a nanospot with a dynamically controlled focal length by varying the dielectric strip width or the graphene Fermi level E f . For instance, with λ0 = 8 µm and E f at 0.3, 0.6 and 0.9 eV, focal lengths of 4.5, 3.8 and 3.5 µm with its corresponding FWHM of 64, 232 and 320 nm, respectively, can be realized. The variation of the focusing efficiency with respect to the incident wavelength and the Fermi level were also investigated. The results of theoretical analysis based on light differential equations agree well with the finite element analysis simulation, which further validate the model.

Funder

National Natural Science Foundation of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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