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

Autor:	Yaoju Zhang, Qiong Yu, Xinyi Chen, Bo Zhang
Rok vydání:	2022
Předmět:	Computational Theory and Mathematics General Physics and Astronomy Statistical and Nonlinear Physics Mathematical Physics Computer Science Applications
Zdroj:	International Journal of Modern Physics C. 33
ISSN:	1793-6586 0129-1831
DOI:	10.1142/s0129183122500887
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a48f43b3f019f74b9eb196733dda76fc https://doi.org/10.1142/s0129183122500887 Zobrazit plný text záznamu