Cargando…
Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum
Numerous device structures have been proposed for perfect absorption in monolayer graphene under single-sided illumination, all of which requires the critical coupling condition, i.e., the balance between the loss of graphene and the leakage rate of the device. However, due to the difficulty of the...
Autores principales: | , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8613217/ https://www.ncbi.nlm.nih.gov/pubmed/34819588 http://dx.doi.org/10.1038/s41598-021-02318-8 |
_version_ | 1784603591776927744 |
---|---|
author | Lee, Sangjun Song, Joohyung Kim, Sangin |
author_facet | Lee, Sangjun Song, Joohyung Kim, Sangin |
author_sort | Lee, Sangjun |
collection | PubMed |
description | Numerous device structures have been proposed for perfect absorption in monolayer graphene under single-sided illumination, all of which requires the critical coupling condition, i.e., the balance between the loss of graphene and the leakage rate of the device. However, due to the difficulty of the precise control of the quality of synthesized graphene and unwanted doping in graphene transferred to the substrate, the loss of graphene is rather unpredictable, so that the perfect absorption is quite difficult to achieve in practice. To solve this problem, we designed a novel perfect absorber structure with a loss adaptive leakage rate control function enabled by the quasi-bound states in the continuum (BIC) and numerically demonstrated its performance. Our designed device is based on a slab-waveguide grating supporting both the quasi-BIC and the guided-mode resonance (GMR); the quasi-BIC with an adjustable leakage rate controlled by an incident angle is responsible for absorption, while the GMR works as an internal mirror. Since the proposed device scheme can have an arbitrarily small leakage rate, it can be used to implement a perfect absorber for any kind of ultrathin absorbing media. Due to the simple structure avoiding an external reflector, the device is easy to fabricate. |
format | Online Article Text |
id | pubmed-8613217 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-86132172021-11-26 Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum Lee, Sangjun Song, Joohyung Kim, Sangin Sci Rep Article Numerous device structures have been proposed for perfect absorption in monolayer graphene under single-sided illumination, all of which requires the critical coupling condition, i.e., the balance between the loss of graphene and the leakage rate of the device. However, due to the difficulty of the precise control of the quality of synthesized graphene and unwanted doping in graphene transferred to the substrate, the loss of graphene is rather unpredictable, so that the perfect absorption is quite difficult to achieve in practice. To solve this problem, we designed a novel perfect absorber structure with a loss adaptive leakage rate control function enabled by the quasi-bound states in the continuum (BIC) and numerically demonstrated its performance. Our designed device is based on a slab-waveguide grating supporting both the quasi-BIC and the guided-mode resonance (GMR); the quasi-BIC with an adjustable leakage rate controlled by an incident angle is responsible for absorption, while the GMR works as an internal mirror. Since the proposed device scheme can have an arbitrarily small leakage rate, it can be used to implement a perfect absorber for any kind of ultrathin absorbing media. Due to the simple structure avoiding an external reflector, the device is easy to fabricate. Nature Publishing Group UK 2021-11-24 /pmc/articles/PMC8613217/ /pubmed/34819588 http://dx.doi.org/10.1038/s41598-021-02318-8 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Lee, Sangjun Song, Joohyung Kim, Sangin Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum |
title | Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum |
title_full | Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum |
title_fullStr | Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum |
title_full_unstemmed | Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum |
title_short | Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum |
title_sort | graphene perfect absorber with loss adaptive q-factor control function enabled by quasi-bound states in the continuum |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8613217/ https://www.ncbi.nlm.nih.gov/pubmed/34819588 http://dx.doi.org/10.1038/s41598-021-02318-8 |
work_keys_str_mv | AT leesangjun grapheneperfectabsorberwithlossadaptiveqfactorcontrolfunctionenabledbyquasiboundstatesinthecontinuum AT songjoohyung grapheneperfectabsorberwithlossadaptiveqfactorcontrolfunctionenabledbyquasiboundstatesinthecontinuum AT kimsangin grapheneperfectabsorberwithlossadaptiveqfactorcontrolfunctionenabledbyquasiboundstatesinthecontinuum |