Cargando…

Dual Tunable Electromagnetically Induced Transparency Based on a Grating-Assisted Double-Layer Graphene Hybrid Structure at Terahertz Frequencies

We propose a graphene plasmonic structure by applying two graphene layers mingled with a thin gold layer in a silicon grating. By utilizing the finite-difference time-domain (FDTD) method, we investigate the optical response of the system, and observe that the design achieves dual tunable electromag...

Descripción completa

Detalles Bibliográficos
Autores principales: Zhong, Xu, Wu, Tiesheng, Liu, Zhihui, Yang, Dan, Yang, Zuning, Liu, Rui, Liu, Yan, Wang, Junyi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9654115/
https://www.ncbi.nlm.nih.gov/pubmed/36364629
http://dx.doi.org/10.3390/nano12213853
_version_ 1784828849447501824
author Zhong, Xu
Wu, Tiesheng
Liu, Zhihui
Yang, Dan
Yang, Zuning
Liu, Rui
Liu, Yan
Wang, Junyi
author_facet Zhong, Xu
Wu, Tiesheng
Liu, Zhihui
Yang, Dan
Yang, Zuning
Liu, Rui
Liu, Yan
Wang, Junyi
author_sort Zhong, Xu
collection PubMed
description We propose a graphene plasmonic structure by applying two graphene layers mingled with a thin gold layer in a silicon grating. By utilizing the finite-difference time-domain (FDTD) method, we investigate the optical response of the system, and observe that the design achieves dual tunable electromagnetically induced transparency (EIT)-like effect at terahertz frequencies. The EIT-like effect arises from the destructive interference between the grapheme-layer bright modes and the gold-layer dark mode. The EIT-like phenomenon can be adjusted by the Fermi level, which is related to the applied voltage. The results show that the group delay of the present structure reaches 0.62 ps in the terahertz band, the group refractive index exceeds 1200, the maximum delay-bandwidth product is 0.972, and the EIT-like peak frequency transmittance is up to 0.89. This indicates that the device has good slow light performance. The proposed structure might enable promising applications in slow-light devices.
format Online
Article
Text
id pubmed-9654115
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-96541152022-11-15 Dual Tunable Electromagnetically Induced Transparency Based on a Grating-Assisted Double-Layer Graphene Hybrid Structure at Terahertz Frequencies Zhong, Xu Wu, Tiesheng Liu, Zhihui Yang, Dan Yang, Zuning Liu, Rui Liu, Yan Wang, Junyi Nanomaterials (Basel) Article We propose a graphene plasmonic structure by applying two graphene layers mingled with a thin gold layer in a silicon grating. By utilizing the finite-difference time-domain (FDTD) method, we investigate the optical response of the system, and observe that the design achieves dual tunable electromagnetically induced transparency (EIT)-like effect at terahertz frequencies. The EIT-like effect arises from the destructive interference between the grapheme-layer bright modes and the gold-layer dark mode. The EIT-like phenomenon can be adjusted by the Fermi level, which is related to the applied voltage. The results show that the group delay of the present structure reaches 0.62 ps in the terahertz band, the group refractive index exceeds 1200, the maximum delay-bandwidth product is 0.972, and the EIT-like peak frequency transmittance is up to 0.89. This indicates that the device has good slow light performance. The proposed structure might enable promising applications in slow-light devices. MDPI 2022-11-01 /pmc/articles/PMC9654115/ /pubmed/36364629 http://dx.doi.org/10.3390/nano12213853 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhong, Xu
Wu, Tiesheng
Liu, Zhihui
Yang, Dan
Yang, Zuning
Liu, Rui
Liu, Yan
Wang, Junyi
Dual Tunable Electromagnetically Induced Transparency Based on a Grating-Assisted Double-Layer Graphene Hybrid Structure at Terahertz Frequencies
title Dual Tunable Electromagnetically Induced Transparency Based on a Grating-Assisted Double-Layer Graphene Hybrid Structure at Terahertz Frequencies
title_full Dual Tunable Electromagnetically Induced Transparency Based on a Grating-Assisted Double-Layer Graphene Hybrid Structure at Terahertz Frequencies
title_fullStr Dual Tunable Electromagnetically Induced Transparency Based on a Grating-Assisted Double-Layer Graphene Hybrid Structure at Terahertz Frequencies
title_full_unstemmed Dual Tunable Electromagnetically Induced Transparency Based on a Grating-Assisted Double-Layer Graphene Hybrid Structure at Terahertz Frequencies
title_short Dual Tunable Electromagnetically Induced Transparency Based on a Grating-Assisted Double-Layer Graphene Hybrid Structure at Terahertz Frequencies
title_sort dual tunable electromagnetically induced transparency based on a grating-assisted double-layer graphene hybrid structure at terahertz frequencies
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9654115/
https://www.ncbi.nlm.nih.gov/pubmed/36364629
http://dx.doi.org/10.3390/nano12213853
work_keys_str_mv AT zhongxu dualtunableelectromagneticallyinducedtransparencybasedonagratingassisteddoublelayergraphenehybridstructureatterahertzfrequencies
AT wutiesheng dualtunableelectromagneticallyinducedtransparencybasedonagratingassisteddoublelayergraphenehybridstructureatterahertzfrequencies
AT liuzhihui dualtunableelectromagneticallyinducedtransparencybasedonagratingassisteddoublelayergraphenehybridstructureatterahertzfrequencies
AT yangdan dualtunableelectromagneticallyinducedtransparencybasedonagratingassisteddoublelayergraphenehybridstructureatterahertzfrequencies
AT yangzuning dualtunableelectromagneticallyinducedtransparencybasedonagratingassisteddoublelayergraphenehybridstructureatterahertzfrequencies
AT liurui dualtunableelectromagneticallyinducedtransparencybasedonagratingassisteddoublelayergraphenehybridstructureatterahertzfrequencies
AT liuyan dualtunableelectromagneticallyinducedtransparencybasedonagratingassisteddoublelayergraphenehybridstructureatterahertzfrequencies
AT wangjunyi dualtunableelectromagneticallyinducedtransparencybasedonagratingassisteddoublelayergraphenehybridstructureatterahertzfrequencies