Large-period plasmonic grating with sinusoidal profile for monitoring water quality with high sensitivity

IF 2.5 3区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2023-11-17 DOI:10.1016/j.photonics.2023.101199
Vaswati Biswas , R. Vijaya
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Abstract

Subwavelength-thick modulation of surface profile of a dielectric layer combined with a nanometer-thick metallic coating on it can be used for highly sensitive refractive index sensing using the concept of surface plasmon resonance. The performance efficiency of a 1D sinusoidal plasmonic grating of higher periodicity made of polymethylmethacrylate with gold coating on it is evaluated for monitoring water quality. The sinusoidal structure is fabricated by the cost-effective soft imprint lithography technique using a commercially available compact disk as master. Even though the master has a step profile, the solution-based technique aids in achieving the sinusoidal profile. The higher periodicity aids in attaining a higher sensitivity of 1533 nm/RIU at normal incidence and also provides a broad wavelength detection regime that can be controlled by the incidence angle. As the sinusoidal grating supports only the fundamental mode of the surface plasmon, it allows for more precise detection of any analyte. The optimized parameters for the structure are obtained through finite element method calculation.

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用于高灵敏度水质监测的大周期正弦型等离子体光栅
利用表面等离子体共振的概念,结合纳米厚金属涂层对介电层表面轮廓进行亚波长厚调制,可用于高灵敏度折射率传感。评价了涂金的聚甲基丙烯酸甲酯制备的高周期性一维正弦等离子体光栅用于水质监测的性能效率。正弦波结构是采用廉价的软压印光刻技术,以市售光盘为主要材料制成的。即使大师有一个阶梯的轮廓,解决方案为基础的技术有助于实现正弦轮廓。较高的周期性有助于在正常入射角下获得1533 nm/RIU的更高灵敏度,并且还提供了可以通过入射角控制的宽波长检测范围。由于正弦光栅只支持表面等离子体的基本模式,它允许更精确地检测任何分析物。通过有限元法计算得到结构的优化参数。
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来源期刊
CiteScore
5.00
自引率
3.70%
发文量
77
审稿时长
62 days
期刊介绍: This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.
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