Cargando…

Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM(0) Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure

This study proposes a highly sensitive refractive-index (RI) sensor based on a TM(0) waveguide mode resonance excited in an asymmetric metal-cladding dielectric waveguide structure, where the analyte serves as the guiding layer. By scanning the wavelength at fixed angles of incidence, the reflection...

Descripción completa

Detalles Bibliográficos
Autores principales: Wang, Xiangxian, Wu, Xiaoxiong, Zhu, Jiankai, Pang, Zhiyuan, Yang, Hua, Qi, Yunping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6427475/
https://www.ncbi.nlm.nih.gov/pubmed/30857160
http://dx.doi.org/10.3390/s19051187
_version_ 1783405219279798272
author Wang, Xiangxian
Wu, Xiaoxiong
Zhu, Jiankai
Pang, Zhiyuan
Yang, Hua
Qi, Yunping
author_facet Wang, Xiangxian
Wu, Xiaoxiong
Zhu, Jiankai
Pang, Zhiyuan
Yang, Hua
Qi, Yunping
author_sort Wang, Xiangxian
collection PubMed
description This study proposes a highly sensitive refractive-index (RI) sensor based on a TM(0) waveguide mode resonance excited in an asymmetric metal-cladding dielectric waveguide structure, where the analyte serves as the guiding layer. By scanning the wavelength at fixed angles of incidence, the reflection spectra of the sensor were obtained. The results showed that the resonance wavelength redshifted dramatically with increases in the analyte RI, which indicates that this approach can be used to sense both the resonance wavelength and the analyte RI. Based on this approach, we investigated the sensing properties, including the sensitivity and figure of merit, at fixed incident angles of 60° and 45°, at which the sensitivity of the sensor reached 7724.9 nm/RIU (refractive index units) and 1339 nm/RIU, respectively. Compared with surface plasmon resonance sensors, which are based on a similar structure, the proposed sensor can accept a more flexible range of incident angles and a wider sensing range of analyte RI. This approach thus has tremendous potential for use in numerous sensing domains, such as biochemical and medical analyses.
format Online
Article
Text
id pubmed-6427475
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-64274752019-04-15 Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM(0) Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure Wang, Xiangxian Wu, Xiaoxiong Zhu, Jiankai Pang, Zhiyuan Yang, Hua Qi, Yunping Sensors (Basel) Article This study proposes a highly sensitive refractive-index (RI) sensor based on a TM(0) waveguide mode resonance excited in an asymmetric metal-cladding dielectric waveguide structure, where the analyte serves as the guiding layer. By scanning the wavelength at fixed angles of incidence, the reflection spectra of the sensor were obtained. The results showed that the resonance wavelength redshifted dramatically with increases in the analyte RI, which indicates that this approach can be used to sense both the resonance wavelength and the analyte RI. Based on this approach, we investigated the sensing properties, including the sensitivity and figure of merit, at fixed incident angles of 60° and 45°, at which the sensitivity of the sensor reached 7724.9 nm/RIU (refractive index units) and 1339 nm/RIU, respectively. Compared with surface plasmon resonance sensors, which are based on a similar structure, the proposed sensor can accept a more flexible range of incident angles and a wider sensing range of analyte RI. This approach thus has tremendous potential for use in numerous sensing domains, such as biochemical and medical analyses. MDPI 2019-03-08 /pmc/articles/PMC6427475/ /pubmed/30857160 http://dx.doi.org/10.3390/s19051187 Text en © 2019 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
Wang, Xiangxian
Wu, Xiaoxiong
Zhu, Jiankai
Pang, Zhiyuan
Yang, Hua
Qi, Yunping
Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM(0) Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure
title Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM(0) Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure
title_full Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM(0) Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure
title_fullStr Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM(0) Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure
title_full_unstemmed Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM(0) Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure
title_short Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM(0) Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure
title_sort theoretical investigation of a highly sensitive refractive-index sensor based on tm(0) waveguide mode resonance excited in an asymmetric metal-cladding dielectric waveguide structure
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6427475/
https://www.ncbi.nlm.nih.gov/pubmed/30857160
http://dx.doi.org/10.3390/s19051187
work_keys_str_mv AT wangxiangxian theoreticalinvestigationofahighlysensitiverefractiveindexsensorbasedontm0waveguidemoderesonanceexcitedinanasymmetricmetalcladdingdielectricwaveguidestructure
AT wuxiaoxiong theoreticalinvestigationofahighlysensitiverefractiveindexsensorbasedontm0waveguidemoderesonanceexcitedinanasymmetricmetalcladdingdielectricwaveguidestructure
AT zhujiankai theoreticalinvestigationofahighlysensitiverefractiveindexsensorbasedontm0waveguidemoderesonanceexcitedinanasymmetricmetalcladdingdielectricwaveguidestructure
AT pangzhiyuan theoreticalinvestigationofahighlysensitiverefractiveindexsensorbasedontm0waveguidemoderesonanceexcitedinanasymmetricmetalcladdingdielectricwaveguidestructure
AT yanghua theoreticalinvestigationofahighlysensitiverefractiveindexsensorbasedontm0waveguidemoderesonanceexcitedinanasymmetricmetalcladdingdielectricwaveguidestructure
AT qiyunping theoreticalinvestigationofahighlysensitiverefractiveindexsensorbasedontm0waveguidemoderesonanceexcitedinanasymmetricmetalcladdingdielectricwaveguidestructure