A proposal of a perfect graphene absorber with enhanced design andfabrication tolerance

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/473926.do
DOI
10.1038/s41598-017-04995-w
Title
A proposal of a perfect graphene absorber with enhanced design andfabrication tolerance
Description
This work was supported by the National Research Foundation of Korea(NRF-2014-R1A2A2A01006720, NRF-2017R1A2A2A05001226, andNRF-2015M3C1A3022539). This work was also partially supported by theKIST Institutional Program (Project No. 2E26680-16-P024).
abstract
We propose a novel device structure for the perfect absorption of a one-sided lightwave illumination, which consists of a high-contrast grating (HCG) and an evanescently coupled slab with an absorbing medium (graphene). The operation principle and design process of the proposed structure are analyzed using the coupled mode theory (CMT), which is confirmed by the rigorous coupled wave analysis (RCWA). According to the CMT analysis, in the design of the proposed perfect absorber, the HCG, functioning as a broadband reflector, and the lossy slab structure can be optimized separately. In addition, we have more design parameters than conditions to satisfy; that is, we have more than enough degrees of freedom in the device design. This significantly relieves the complexity of the perfect absorber design. Moreover, in the proposed perfect absorber, most of the incident wave is confined in the slab region with strong field enhancement, so that the absorption performance is very tolerant to the variation of the design parameters near the optimal values for the perfect absorption. It has been demonstrated numerically that absorption spectrum tuning over a wider wavelength range of similar to 300 nm is possible, keeping significantly high maximum absorption (>95%). It is also shown that the proposed perfect absorber outperforms the previously proposed scheme in all aspects.
provenance
Made available in Cube on 2018-09-28T10:32:34Z (GMT). No. of bitstreams: 0
language
English
author
Lee, Sangjun
Tran, Thang Q.
Heo, Hyungjun
Kim, Myunghwan
Kim, Sangin
accessioned
2018-09-28T10:32:34Z
available
2018-09-28T10:32:34Z
issued
2017
citation
SCIENTIFIC REPORTS(7)
issn
2045-2322
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/473926.do
Funder
과학기술정보통신부
Funding Program
STEAM연구
Project ID
1711048704
Jurisdiction
Rep.of Korea
Project Name
Simulation study for phase-controllable active light-sources and lenses
rights
openAccess
type
article


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