Subwavelength focusing of a cylindrically symmetric plano-concave lens based on a one-dimensional Thue–Morse photonic quasicrystal. (2nd August 2018)

• Record Type: Journal Article
• Authors: Tan, Wei; Liu, Exian; Yan, Bei; Xie, Jianlan; Ge, Rui; Tang, Dongliang; Liu, Jianjun; Wen, Shuangchun
• Is Part Of: Applied physics express. Volume 11:Number 9(2018)
• Publication Date: 2018-08-02
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.11.092002
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: A cylindrically symmetric plano-concave lens based on a one-dimensional (1D) Thue–Morse photonic quasicrystal (PQC) is proposed. Subwavelength focusing characteristics with an incident cylindrical vector beam are investigated. Numerical results reveal that the lens can exhibit polarization-independent, high-resolution, and low-side-lobe characteristics, simultaneously for near-field and non-near-field. Furthermore, the lens can achieve perfect focusing and size-independent characteristics with equal-proportion scaling of the size of the lens at the corresponding center frequency. The focusing mechanisms of the lens are explained by analyzing the transmission spectrum, dispersion relation of a 1D periodic photonic crystal, and transmission spectrum of the 1D Thue–Morse PQC.