用于大范围折射率传感的多模式灵活廉价质子元表面

IF 4.6 Q1 OPTICS Journal of Physics-Photonics Pub Date : 2024-08-07 DOI:10.1088/2515-7647/ad6963
Vaswati Biswas and R Vijaya
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引用次数: 0

摘要

我们研究了一种等离子体元表面,该表面包含以六边形图案排列在柔性基底上的亚波长特征尺寸的纳米凸块,并覆盖有一层金薄膜,可用作折射率(RI)传感器。所选择的涂金聚合物图案有助于激活表面等离子体极化子模式。通过数值计算,结果表明这种表面可以表现出等离子效应,图案高度极浅,仅为 92.5 纳米,金的厚度极小,仅为 25 纳米。通过计算相关波长的电场剖面,证实了等离子模式的激发。由于该表面对包层指数的变化高度敏感,而且所选的设计有助于激发波长适当分离的三种等离子体模式,因此该表面可用于范围极广的 RI 传感,因为每种模式都对不同范围的 RI 有独特的贡献。研究结果表明,这种元表面适用于多种应用,包括利用模式 1 以 633 nm RIU-1 的灵敏度检测气体,利用模式 2 以 428 nm RIU-1 和模式 3 以 238 nm RIU-1 的灵敏度识别 SARS-CoV-2 病毒分子,以及利用模式 3 在高指数范围内区分脑脊液中的正常脑组织和病变脑组织。元表面原型是利用经济实惠的软光刻技术和经济型母模制作的。廉价的制造技术、极薄金属膜的使用以及可见光到近红外范围内的检测波长都意味着这是一种低成本传感器。原型的结构和光学特性验证了样品的数值研究。
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Multi-modal flexible and inexpensive plasmonic metasurface for wide range of refractive index sensing
A plasmonic metasurface containing nanobumps of sub-wavelength feature size arranged in a hexagonal pattern on a flexible substrate and covered with a thin film of gold is investigated as a refractive index (RI) sensor. The chosen polymer patterns coated with gold aid in activating the surface plasmon polariton modes. Using numerical calculations, it is shown that this surface can exhibit plasmonic effect with extremely shallow pattern height of 92.5 nm and minimal thickness of 25 nm of gold over it. The excitation of the plasmonic modes is confirmed using electric field profiles calculated at the relevant wavelengths. As the surface is highly sensitive to changes in the cladding index, and the chosen design aids in exciting three plasmon modes that are suitably well-separated in wavelength, this surface can be used for an extremely wide range of RI sensing because each mode contributes uniquely to a different range of RI. The results establish that the metasurface is suitable for a variety of applications, including gas detection with a sensitivity of 633 nm RIU−1 using mode-1, identifying SARS-CoV-2 viral molecules with a sensitivity of 428 nm RIU−1 using mode-2 and 238 nm RIU−1 using mode-3, and discriminating between normal and diseased brain tissues in the cerebrospinal fluid in the high-index range using mode-3. The prototype metasurface is made using a cost-effective soft lithography technique using an economical master mould. The inexpensive technique of fabrication, use of very thin metal film, and wavelength of detection lying within the visible to near infrared range imply a low-cost sensor. The structural and optical characterization of the prototype validates the numerical study of the sample.
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来源期刊
CiteScore
10.70
自引率
0.00%
发文量
27
审稿时长
12 weeks
期刊最新文献
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