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Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO(2) Hybrid Metasurface

We investigate Fano resonances and sensing enhancements in a simple Au/TiO(2) hybrid metasurface through the finite-different time-domain (FDTD) simulation and coupled mode theory (CMT) analysis. The results show that the Fano resonance in the proposed simple metasurface is caused by the destructive...

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Autores principales: He, Zhihui, Xue, Weiwei, Cui, Wei, Li, Chunjiang, Li, Zhenxiong, Pu, Lihui, Feng, Jiaojiao, Xiao, Xintao, Wang, Xuyang, Li, Gang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7221975/
https://www.ncbi.nlm.nih.gov/pubmed/32260584
http://dx.doi.org/10.3390/nano10040687
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author He, Zhihui
Xue, Weiwei
Cui, Wei
Li, Chunjiang
Li, Zhenxiong
Pu, Lihui
Feng, Jiaojiao
Xiao, Xintao
Wang, Xuyang
Li, Gang
author_facet He, Zhihui
Xue, Weiwei
Cui, Wei
Li, Chunjiang
Li, Zhenxiong
Pu, Lihui
Feng, Jiaojiao
Xiao, Xintao
Wang, Xuyang
Li, Gang
author_sort He, Zhihui
collection PubMed
description We investigate Fano resonances and sensing enhancements in a simple Au/TiO(2) hybrid metasurface through the finite-different time-domain (FDTD) simulation and coupled mode theory (CMT) analysis. The results show that the Fano resonance in the proposed simple metasurface is caused by the destructive interaction between the surface plasmon polaritons (SPPs) and the local surface plasmon resonances (LSPRs), the quality factor and dephasing time for the Fano resonance can be effectively tuned by the thickness of Au and TiO(2) structures, the length of each unit in x and y directions, as well as the structural defect. In particular, single Fano resonance splits into multiple Fano resonances caused by a stub-shaped defect, and multiple Fano resonances can be tuned by the size and position of the stub-shaped defect. Moreover, we also find that the sensitivity in the Au/TiO(2) hybrid metasurface with the stub-shaped defect can reach up to 330 nm/RIU and 535 nm/RIU at the Fano resonance 1 and Fano resonance 2, which is more than three times as sensitive in the Au/TiO(2) hybrid metasurface without the stub-shaped defect, and also higher than that in the TiO(2) metasurface reported before. These results may provide further understanding of Fano resonances and guidance for designing ultra-high sensitive refractive index sensors.
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spelling pubmed-72219752020-05-22 Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO(2) Hybrid Metasurface He, Zhihui Xue, Weiwei Cui, Wei Li, Chunjiang Li, Zhenxiong Pu, Lihui Feng, Jiaojiao Xiao, Xintao Wang, Xuyang Li, Gang Nanomaterials (Basel) Article We investigate Fano resonances and sensing enhancements in a simple Au/TiO(2) hybrid metasurface through the finite-different time-domain (FDTD) simulation and coupled mode theory (CMT) analysis. The results show that the Fano resonance in the proposed simple metasurface is caused by the destructive interaction between the surface plasmon polaritons (SPPs) and the local surface plasmon resonances (LSPRs), the quality factor and dephasing time for the Fano resonance can be effectively tuned by the thickness of Au and TiO(2) structures, the length of each unit in x and y directions, as well as the structural defect. In particular, single Fano resonance splits into multiple Fano resonances caused by a stub-shaped defect, and multiple Fano resonances can be tuned by the size and position of the stub-shaped defect. Moreover, we also find that the sensitivity in the Au/TiO(2) hybrid metasurface with the stub-shaped defect can reach up to 330 nm/RIU and 535 nm/RIU at the Fano resonance 1 and Fano resonance 2, which is more than three times as sensitive in the Au/TiO(2) hybrid metasurface without the stub-shaped defect, and also higher than that in the TiO(2) metasurface reported before. These results may provide further understanding of Fano resonances and guidance for designing ultra-high sensitive refractive index sensors. MDPI 2020-04-05 /pmc/articles/PMC7221975/ /pubmed/32260584 http://dx.doi.org/10.3390/nano10040687 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
He, Zhihui
Xue, Weiwei
Cui, Wei
Li, Chunjiang
Li, Zhenxiong
Pu, Lihui
Feng, Jiaojiao
Xiao, Xintao
Wang, Xuyang
Li, Gang
Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO(2) Hybrid Metasurface
title Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO(2) Hybrid Metasurface
title_full Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO(2) Hybrid Metasurface
title_fullStr Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO(2) Hybrid Metasurface
title_full_unstemmed Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO(2) Hybrid Metasurface
title_short Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO(2) Hybrid Metasurface
title_sort tunable fano resonance and enhanced sensing in a simple au/tio(2) hybrid metasurface
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7221975/
https://www.ncbi.nlm.nih.gov/pubmed/32260584
http://dx.doi.org/10.3390/nano10040687
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