1. Effect of ultra-shallow metallic gratings on sensitivity enhancement of Goos-Hanchen shift in SPR-based sensors
- Author
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Kaihua Wei, Ken-Tye Yong, Kuanbiao Li, Nishtha Manish Singh, Chandreyee Manas Das, Yan Guo, Philippe Coquet, CNRS International NTU THALES Research Alliance (UMI CINTRA), THALES-Nanyang Technological University [Singapour]-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), National Natural Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC) [11304070, 61705056], Singapore National Research FoundationNational Research Foundation, Singapore, French National Research AgencyFrench National Research Agency (ANR) [NRF2017-ANR002 2DPS], Zhejiang Provincial Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang Province [LGF20F050004], CNRS International - NTU - Thales Research Alliance (CINTRA), and THALES [France]-Nanyang Technological University [Singapour]-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,Physics::Optics ,02 engineering and technology ,Grating ,01 natural sciences ,Electromagnetic radiation ,010309 optics ,[SPI]Engineering Sciences [physics] ,Sensitivity ,0103 physical sciences ,Electrical and Electronic Engineering ,Surface plasmon resonance ,Penetration depth ,Surface plasmon polariton ,Metallic grating ,business.industry ,Goos-Hanchen shift ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Wavelength ,Reflection (physics) ,Optoelectronics ,Prism ,0210 nano-technology ,business ,Refractive index - Abstract
International audience; Metallic gratings have flexible and powerful modulation effects on electromagnetic waves. Reflection and transmission spectra of metallic gratings may become extremely narrow or ultra wide depending on the grating parameters. In this paper, a surface plasmon resonance-based sensing system comprising of a metallic grating coupled with a prism configuration was proposed. The effects of all parameters of the sensing system on the Goos-Hadnchen shift and sensitivity were studied in detail, and the results showed that ultra-shallow metallic gratings with large duty cycles, with no other materials involved, are more beneficial. In addition, a set of optimum parameters was obtained at the incident wavelength. Compared with the conventional SPR-based gold sensing chip, strongly coupled surface plasmon resonance around the grating enlarges the penetration depth, and enhances both Goos-Hadnchen shift and the corresponding sensitivity by 5.6 times, with increasing refractive indices of the analyte solutions. These results indicate that the proposed ultra-shallow metal grating-based sensing structure is in favor of detecting ultralow concentrations of biomolecules in the analyte solutions.
- Published
- 2020