Numerical Study on the Absorption Characteristics of Subwavelength Metallic Gratings Covered with a Lossy Dielectric Layer

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 subw...

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Bibliographic Details
Published in:Applied sciences 2018-09, Vol.8 (9), p.1445
Main Authors: Hwang, Chi-Young, Kim, Yong-Hae, Choi, Ji, Kim, Gi, Yang, Jong-Heon, Pi, Jae-Eun, Kim, Hee-Ok, Hwang, Chi-Sun
Format: Article
Language:English
Subjects:
Absorption
Absorption spectra
Light
Light diffraction
optical absorber
perfect absorption
resonant cavity
Substrates
subwavelength metallic grating
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8091445