Enhancement of near-field subwavelength focusing using a solid immersion Fresnel zone plate with radially polarized incidence

Yaoju Zhang, Qiong Yu, Xinyi Chen and Bo Zhang
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Yaoju Zhang: School of Electronic and Communication Engineering, Quanzhou University of Information Engineering, Quanzhou 362000, P. R. China
Qiong Yu: School of Electronic and Communication Engineering, Quanzhou University of Information Engineering, Quanzhou 362000, P. R. China
Xinyi Chen: School of Electronic and Communication Engineering, Quanzhou University of Information Engineering, Quanzhou 362000, P. R. China
Bo Zhang: School of Electronic and Communication Engineering, Quanzhou University of Information Engineering, Quanzhou 362000, P. R. China

International Journal of Modern Physics C (IJMPC), 2022, vol. 33, issue 07, 1-13

Abstract: A solid immersion Fresnel zone plate (SI-FZP) is designed, and its near-field diffraction characteristics are analyzed using the vector angular spectrum (VAS) method. The analytical VAS model of formulism for the electric field vector transmitted from a binary amplitude and/or phase circular SI-FZP is obtained for any polarization of incidence. Numerical calculations show that, when the solid film immersing a high-numerical-aperture FZP is truncated close to the FZP’s focus in a single homogeneous medium, the focusing intensity in the vicinity of the SI-FZP–air interface can be improved dozens of times in magnitude for radially polarized incidence, compared with the FZP’s far-field focusing in the single medium without an interface. The validity of the proposed analytical VAS model of formulism to analyze SI-FZP’s diffraction problems has been affirmed by comparison with numerical results obtained by the finite-difference time-domain simulation.

Keywords: Solid immersion Fresnel zone plate; near-field focusing; vector diffraction; angular spectrum method; radially polarized incidence (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0129183122500887

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