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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...

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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
Descripción
Sumario: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.