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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM0 Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure
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Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM0 Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure

机译：基于非对称金属包层介质波导结构中基于TM0波导模式共振的高灵敏度折射率传感器的理论研究

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摘要

This study proposes a highly sensitive refractive-index (RI) sensor based on a TM0 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.
机译：这项研究提出了一种高灵敏度的折射率（RI）传感器，该传感器基于在非对称金属包层介质波导结构中激发的TM0波导模式共振，其中分析物用作引导层。通过以固定的入射角扫描波长，可以获得传感器的反射光谱。结果表明，共振波长随分析物RI的增加而急剧红移，这表明该方法可用于检测共振波长和分析物RI。基于这种方法，我们研究了固定入射角为60°和45°时的敏感度，包括灵敏度和品质因数，在该角度下传感器的灵敏度分别达到7724.9 nm / RIU（折射率单位）和1339 nm / RIU。与基于类似结构的表面等离振子共振传感器相比，该传感器可以接受更灵活的入射角范围和更宽的分析物RI感测范围。因此，这种方法具有巨大的潜力，可用于许多传感领域，例如生化和医学分析。

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