Ex) Article Title, Author, Keywords
New Phys.: Sae Mulli 2020; 70: 804-809
Published online September 29, 2020 https://doi.org/10.3938/NPSM.70.804
Copyright © New Physics: Sae Mulli.
Daseul JEONG1, Kyoung-Ho KIM*1,2
1Department of Physics, Chungbuk National University, Cheongju 28644, Korea
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