This paper reports an advanced and novel sensing idea by utilizing the concept of surface plasmon resonance. A numerically designed model of plasmonic-based sensor has been proposed that is capable of detecting the mixture of water in alcohol and in a variety of other electrolytes including milk, hemoglobin, octane, etc. The sensor uses gold as a recognition element with equidistant slits for the transmission of incoming light which give rise to plasmon polaritons on metal–dielectric–interface. The zeroth-order transmission spectra have been extracted for this investigation and optimization. A transverse magnetic wave illuminates the noble metal normally through a glass substrate generating surface plasmon polaritons (SPPs) on a particular wavelength which changes with respect to the refractive index of adjacent medium. The sensor model has been numerically solved after optimization of slit size by keeping other parameters fixed utilizing the fundamental plasmonic mode for efficient excitation of SPPs. In this sensing chip, a uniform spatial period of about 660 nm, a constant slit size of 320 nm, a gold thickness of 50 nm for sensing element and 500 nm for glass substrate are used. An appreciable increment in the value of refractive index sensitivity of 668.66 nm per RIU has been found which is noteworthy. Such sensors are likely been welcomed in biological investigation, along with chemical and environmental detection techniques.

本文利用表面等离振子共振的概念报道了一种先进而新颖的传感思想。已经提出了一种基于等离激元的传感器的数字设计模型，该模型能够检测乙醇和牛奶，血红蛋白，辛烷等各种其他电解质中的水混合物。该传感器使用金作为具有等距狭缝的识别元素用于入射光的传输，在金属-电介质-界面上产生等离激元极化子。零阶透射光谱已被提取用于该研究和优化。横向电磁波通常通过玻璃基板照亮贵金属，该玻璃基板在特定波长上产生表面等离子体激元极化子（SPP），该特定波长随相邻介质的折射率而变化。优化狭缝尺寸后，通过使用基本等离激元模式保持其他参数固定以有效激发SPP，从而对传感器模型进行了数值求解。在该感测芯片中，使用了约660 nm的均匀空间周期，320 nm的恒定缝隙大小，感测元件的金厚度为50 nm，玻璃基板的金厚度为500 nm。已经发现，每个RIU的折射率灵敏度值明显增加了668.66 nm，这是值得注意的。此类传感器以及化学和环境检测技术很可能在生物学研究中受到欢迎。恒定的狭缝尺寸为320 nm，感测元件的金厚度为50 nm，玻璃基板的金厚度为500 nm。已经发现，每个RIU的折射率灵敏度值明显增加了668.66 nm，这是值得注意的。此类传感器以及化学和环境检测技术很可能在生物学研究中受到欢迎。恒定的狭缝尺寸为320 nm，感测元件的金厚度为50 nm，玻璃基板的金厚度为500 nm。已经发现，每个RIU的折射率灵敏度值明显增加了668.66 nm，这是值得注意的。此类传感器以及化学和环境检测技术很可能在生物学研究中受到欢迎。