npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2020; 70: 804-809

Published online September 29, 2020

Copyright © New Physics: Sae Mulli.

Characterization of near Infrared Light Transmission in Periodic Subwavelength Nanoslit Array by Using Effective Medium Theory

Daseul JEONG1, Kyoung-Ho KIM*1,2

1Department of Physics, Chungbuk National University, Cheongju 28644, Korea

2Research Institute for Nanoscale Science and Technology, Chungbuk National University, Cheongju 28644, Korea


Received: June 23, 2020; Revised: August 3, 2020; Accepted: August 5, 2020


Metallic nanoslits are useful for optical devices with strong light-matter interactions based on electric-field enhancements. The periodic array of metallic nanoslits with subwavelength pitch is promising because of the enhanced light transmission resulting in a high signal-to-noise ratio in the transmitted light signal. Here, we discuss the effective medium analysis of a periodic subwavelength nanoslit array composed of noble metals, that should be useful for the design of a nanoslit array. We calculate the optical transmission spectrum of a metallic nanoslit array for P-polarized incident light in the near infrared region by using full-wave numerical simulations; then, we analyze the transmission spectrum and its resonant light transmission by using an effective medium theory. The results show that the resonant transmission, which depends on the shape of the metallic nanostructures, can be analyzed in terms of changes in the effective permittivity and permeability, thereby it facilitating the efficient derivation of the design parameters of nanoslits for near infrared optical devices.

Keywords: Metallic nanoslits, Near infrared plasmon, Effective medium theory

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