상세정보
학술지
Numerical Study on the Absorption Characteristics of Subwavelength Metallic Gratings Covered with a Lossy Dielectric Layer
- 발행일
- 201809
- 출처
- Applied Sciences, v.8 no.9, pp.1-10
- ISSN
- 2076-3417
- 출판사
- MDPI AG
- 협약과제
- 18MF1200, 디지털 홀로그래픽 테이블탑형 단말 기술 개발, 김진웅
- 초록
- 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 제안 키워드
- Absorption characteristic, Absorption features, Absorption properties, Broadband applications, Frequency Range, Lossy dielectric layer, Numerical simulations, Spectral absorption, Subwavelength metallic gratings, Visible range, absorption profile
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