Tight focusing field of cylindrical vector beams based on cascaded low-refractive index metamaterials
Author:
Ke Lan1, Li Chenxia1ORCID, Zhang Simeng1, Fang Bo2, Tang Ying1, Hong Zhi3, Jing Xufeng1ORCID
Affiliation:
1. Institute of Optoelectronic Technology and the Centre for THz Research, China Jiliang University , Hangzhou 314423 , China 2. College of Metrology & Measurement Engineering, China Jiliang University , Hangzhou 310018 , China 3. Centre for THz Research, China Jiliang University , Hangzhou 310018 , China
Abstract
Abstract
Using low-refractive-index metamaterials, we design a transmission-type radial-angular cylindrical vector beam generator. A high numerical aperture lens is constructed using an asymmetric meta-grating structure. The metamaterial vector beam generator and the meta-grating lens are physically cascaded to obtain the tight focusing characteristics of the vector light field. The vector beam generator module and the meta-lens module are prepared by 3D printing technology, and the near-field test has been carried out on the samples in the terahertz band. Using the physical cascading method, two modules are cascaded to construct a vector beam tight focusing device, and the focusing electric field distribution test has been carried out. The use of 3D printing technology for sample preparation further reduces the manufacturing difficulty and production cost, and ensures the realization of its design function on the basis of miniaturization and light weight, which provides the possibility for the research of tight focusing field regulation in the terahertz band.
Funder
National Natural Science Foundation of China Natural Science Foundation of Zhejiang Province
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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