1. Numerical Study on the Absorption Characteristics of Subwavelength Metallic Gratings Covered with a Lossy Dielectric Layer
- Author
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Ji Hun Choi, Chi-Young Hwang, Chi-Sun Hwang, Hee Ok Kim, Jae Eun Pi, Yong-Hae Kim, Gi Heon Kim, and Jong Heon Yang
- Subjects
Work (thermodynamics) ,Materials science ,Yield (engineering) ,Physics::Optics ,02 engineering and technology ,Lossy compression ,lcsh:Technology ,01 natural sciences ,lcsh:Chemistry ,010309 optics ,resonant cavity ,perfect absorption ,0103 physical sciences ,Broadband ,General Materials Science ,Absorption (electromagnetic radiation) ,lcsh:QH301-705.5 ,Instrumentation ,Fluid Flow and Transfer Processes ,Coupling ,Range (particle radiation) ,subwavelength metallic grating ,Computer simulation ,lcsh:T ,business.industry ,Process Chemistry and Technology ,General Engineering ,021001 nanoscience & nanotechnology ,lcsh:QC1-999 ,Computer Science Applications ,lcsh:Biology (General) ,lcsh:QD1-999 ,optical absorber ,lcsh:TA1-2040 ,Optoelectronics ,lcsh:Engineering (General). Civil engineering (General) ,0210 nano-technology ,business ,lcsh:Physics - 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.
- Published
- 2018
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