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Journal Article
Numerical Study on the Absorption Characteristics of Subwavelength Metallic Gratings Covered with a Lossy Dielectric Layer
- Authors
- Chi-Young Hwang, Yong-Hae Kim, Ji Hun Choi, Gi Heon Kim, Jong-Heon Yang, Jae-Eun Pi, Hee-Ok Kim, Chi-Sun Hwang
- Issue Date
- 2018-09
- Citation
- Applied Sciences, v.8, no.9, pp.1-10
- ISSN
- 2076-3417
- Publisher
- MDPI AG
- Language
- English
- Type
- Journal Article
- Abstract
- Optical absorbers have been a topic of intense research due to their importance in many applications. In particular, multi-band and perfect absorption features in a desired frequency range are essential in broadband applications. In this work, we numerically studied the absorption properties of subwavelength metallic gratings coated with a dielectric layer. Here, the structure is considered to be an integration between a resonant cavity and a subwavelength metallic grating. Two appropriately designed structures can exhibit multi-band absorption properties. In addition to the numerical simulation results, we elaborate on determining the appropriate structural parameters that yield the desired spectral absorption profile in the visible range. We also numerically identify critical coupling conditions for perfect absorption.
- KSP Keywords
- Absorption characteristic, Absorption features, Absorption properties, Broadband applications, Frequency Range, Lossy dielectric layer, Numerical simulations, Spectral absorption, Subwavelength metallic gratings, Visible range, absorption profile
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
