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http://dx.doi.org/10.3807/COPP.2019.3.4.285

Optical Phase Properties of Small Numbers of Nanoslits and an Application for Higher-efficiency Fresnel Zone Plates  

Kim, Hyuntai (Department of Electronic & Electrical Convergence Engineering, Hongik University)
Lee, Seung-Yeol (School of Electronics Engineering, Kyungpook National University)
Publication Information
Current Optics and Photonics / v.3, no.4, 2019 , pp. 285-291 More about this Journal
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 ${\sim}0.5{\lambda}$. 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.
Keywords
Metamaterial; Effective medium theory; Nanoslit array; Fresnel zone plate;
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Times Cited By KSCI : 3  (Citation Analysis)
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