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- Title
Numerical Study on the Absorption Characteristics of Subwavelength Metallic Gratings Covered with a Lossy Dielectric Layer.
- Authors
Hwang, Chi-Young; Kim, Yong-Hae; Choi, Ji Hun; Kim, Gi Heon; Yang, Jong-Heon; Pi, Jae-Eun; Kim, Hee-Ok; Hwang, Chi-Sun
- 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.
- Subjects
DIELECTRICS; LIGHT absorption; WAVELENGTHS
- Publication
Applied Sciences (2076-3417), 2018, Vol 8, Issue 9, p1445
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app8091445