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Theoretical and numerical study of cylindrical-vector-mode radiation characteristics in periodic metallic annular slits and their applications

Theoretical and numerical study of cylindrical-vector-mode radiation characteristics in periodic metallic annular slits and their applications
Theoretical and numerical study of cylindrical-vector-mode radiation characteristics in periodic metallic annular slits and their applications
We investigate the radiation characteristics of radially polarized light and azimuthally polarized light through plasmonic subwavelength-scale annular slit (PSAS) structures, by means of both theoretical and numerical methods. Effective-medium theory was utilized to analyze the characteristics of PSAS structures, and the corresponding results showed that PSAS structures can function as a metallic medium for azimuthally polarized light, or as a low-loss dielectric medium for radially polarized light. Numerical calculations based on the finite-element method were also performed, to verify the theoretical analyses. It turned out that the numerical results supported the theoretical results. Moreover, we exploited the PSAS structures in novel nanophotonic elements with dual functionalities that could selectively focus or pass/block incident light, depending on its polarization state. For example, if PSAS structures were implemented in the dielectric region of a metallic Fresnel zone plate, the modified zone plate could function as a blocking element to azimuthally polarized light, yet as a focusing element to radially polarized light. On the contrary, if PSAS structures were implemented in the metallic region of a metallic Fresnel zone plate (i.e. the inverted form of the former), it could function as a focusing element to azimuthally polarized light, yet as a simple transparent element to radially polarized light.
482-487
Kim, Hyuntai
cfbf9241-6bb7-4738-8e2d-4fbc5c1217cc
Jeong, Yoonchan
1c4007b7-fc94-4f7d-a080-929d40946902
Kim, Hyuntai
cfbf9241-6bb7-4738-8e2d-4fbc5c1217cc
Jeong, Yoonchan
1c4007b7-fc94-4f7d-a080-929d40946902

Kim, Hyuntai and Jeong, Yoonchan (2018) Theoretical and numerical study of cylindrical-vector-mode radiation characteristics in periodic metallic annular slits and their applications. Current Optics and Photonics, 2 (5), 482-487. (doi:10.3807/COPP.2018.2.5.482).

Record type: Article

Abstract

We investigate the radiation characteristics of radially polarized light and azimuthally polarized light through plasmonic subwavelength-scale annular slit (PSAS) structures, by means of both theoretical and numerical methods. Effective-medium theory was utilized to analyze the characteristics of PSAS structures, and the corresponding results showed that PSAS structures can function as a metallic medium for azimuthally polarized light, or as a low-loss dielectric medium for radially polarized light. Numerical calculations based on the finite-element method were also performed, to verify the theoretical analyses. It turned out that the numerical results supported the theoretical results. Moreover, we exploited the PSAS structures in novel nanophotonic elements with dual functionalities that could selectively focus or pass/block incident light, depending on its polarization state. For example, if PSAS structures were implemented in the dielectric region of a metallic Fresnel zone plate, the modified zone plate could function as a blocking element to azimuthally polarized light, yet as a focusing element to radially polarized light. On the contrary, if PSAS structures were implemented in the metallic region of a metallic Fresnel zone plate (i.e. the inverted form of the former), it could function as a focusing element to azimuthally polarized light, yet as a simple transparent element to radially polarized light.

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Theoretical and Numerical Study of Cylindrical-vector-mode Radiation Characteristics in Periodic Metallic Annular Slits and Their Applications - Version of Record
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Accepted/In Press date: 31 August 2018
Published date: 25 October 2018

Identifiers

Local EPrints ID: 441709
URI: http://eprints.soton.ac.uk/id/eprint/441709
PURE UUID: 11d0b62a-7a42-4ae2-b6cd-a2085730672b

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Date deposited: 24 Jun 2020 16:30
Last modified: 16 Mar 2024 08:17

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Author: Hyuntai Kim
Author: Yoonchan Jeong

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