Optical Phase Properties of Small Numbers of Nanoslits and an Application for Higher-efficiency Fresnel Zone Plates
- Authors
- Kim, Hyuntai; Lee, Seung-Yeol
- Issue Date
- 25-Aug-2019
- Publisher
- OPTICAL SOC KOREA
- Keywords
- Metamaterial; Effective medium theory; Nanoslit array; Fresnel zone plate
- Citation
- CURRENT OPTICS AND PHOTONICS, v.3, no.4, pp.285 - 291
- Journal Title
- CURRENT OPTICS AND PHOTONICS
- Volume
- 3
- Number
- 4
- Start Page
- 285
- End Page
- 291
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/1193
- DOI
- 10.3807/COPP.2019.3.4.285
- ISSN
- 2508-7266
- Abstract
- We have studied the behavior of light in the intermediate regime between a single nanoslit and an infinite nanoslit array. We first calculated the optical characteristics of a small number of nanoslits using finite element numerical analysis. The phase variance of the proposed nanoslit model shows a gradual phase shift between a single nanoslit and ideal nanoslit array, which stabilizes before the total array length becomes similar to 0.5 lambda. Next, we designed a transmission-enhanced Fresnel zone plate by applying the phase characteristics from the small-number nanoslit model. The virtual-point-source method suggests that the proposed Fresnel zone plate with phase-invariant nanoslits achieves 2.34x higher transmission efficiency than a conventional Fresnel zone plate. Our report describes the intermediate behaviors of a nanoslit array, which could also benefit subwavelength metallic structure research of metasurfaces.
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Collections - College of Science and Technology > Department of Electronic and Electrical Engineering > 1. Journal Articles
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