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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Colorimetric and Near-Absolute Polarization-Insensitive Refractive-Index Sensing in All-Dielectric Guided-Mode Resonance Based Metasurface
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Colorimetric and Near-Absolute Polarization-Insensitive Refractive-Index Sensing in All-Dielectric Guided-Mode Resonance Based Metasurface

机译：基于介电引导模式谐振的比色和近绝对极化 - 不敏感折射率感测

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摘要

Colorimetric detection of target molecules with insensitivity to incident-light polarization has attracted considerable attention in recent years. This resulted from the ability to provide rapid output and reduced assay times as a result of color changes upon altering the environment that are easily distinguishable by the naked eye. In this paper, we propose a highly sensitive refractive-index sensor, utilizing the excitation of guided modes of a novel two-dimensional periodically modulated dielectric grating-waveguide structure. The optimized nanosensor can numerically excite guided-mode resonances with an ultranarrow linewidth (full width at half-maximum) of 0.58 nm. Sensitivity is numerically investigated by considering the deposition of dielectric layers on the structure. For a layer thickness of 30 nm, the maximum sensitivity reached as high as 110 nm/refractive index unit (RIU), resulting in a very high figure of merit of 190. The fabricated devices with 30 nm aluminum oxide and zinc oxide coatings achieved a maximum sensitivity of 235.2 nm/RIU with a linewidth of 19 nm. Colorimetric detection with polarization insensitivity is confirmed practically by a simple optical microscope. Samples with different coatings have been observed to have clearly distinct colors, while the color of each sample is nearly identical upon azimuthal rotation. Excellent agreement is obtained between the numerical and experimental results regarding the spectral position of the resonances and sensitivity. The proposed device is, therefore, highly promising in efficient, highly sensitive, almost lossless, and compact molecular diagnostics in the field of biomedicine with personalized, label-free, early point-of-care diagnosis and field analysis, drug detection, and environmental monitoring.
机译：在近年来，对入射光极化不敏感的靶分子的比色检测引起了相当大的关注。由于在改变肉眼容易区分的环境时，由于颜色改变而导致的能力提供快速输出和降低的测定时间。在本文中，我们提出了一种高灵敏度折射率传感器，利用新型二维周期性调制介电光栅 - 波导结构的引导模式的激发。优化的纳米传感器可以用超箭头线宽（半最大宽度为0.58nm的数字上兴奋的引导模式共振。通过考虑在结构上沉积介电层来进行数值研究灵敏度。对于30nm的层厚度，最大灵敏度高达110nm /折射率单元（RiU），导致190的非常高的优点。具有30nM氧化铝和氧化锌涂层的制造装置实现了a 235.2 nm / Riu的最大灵敏度为19 nm的线宽。通过简单的光学显微镜实际上实际上通过具有极化不敏感性进行比色度检测。已经观察到具有不同涂层的样品，以明显不同的颜色，而每个样品的颜色在方位角旋转时几乎相同。在关于共振和灵敏度的光谱位置的数值和实验结果之间获得了优秀的一致性。因此，所提出的装置具有高效，高度敏感，几乎无损，在生物医学领域的有效，高度敏感，几乎无损，具有个性化，无标签，早期的护理诊断和现场分析，药物检测和环境监测。

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