Abstract
The emerging development of sensing technology initiates innovative sensors achieving low-cost to facilitate practical realization. An interesting crush of the work is to propose a simple structural sensor and to analyze the different schemes of the metal coating by stimulated emission of Raman scattering (SERS) intensification. For the first time, we propose a simple geometrical photonic crystal fiber refractive index based sensor (PCF-RIBS) with three different Schemes A, B, and C, i.e., gold (A) layer-coated surface plasmon resonance (SPR) based D-type PCF-RIBS; Au with titanium-di-oxide (TiO) layer-coated SPR D-type PCF-RIBS; and Au + TiO grating-coated localized surface plasmon resonance (LSPR) D-type PCF-RIBS. Characterizing the three different Schemes A, B, and C using finite element method simulation shows, a maximum wavelength sensitivity of 48,000 nm/RIU, 52,000 nm/RIU and 75,000 nm/RIU, respectively, for a wide range of analyte-refractive index from 1.33 to 1.45 and operates in the wavelength range from 500–2000 nm. Of all the Schemes, Scheme C is found to excite a relatively larger number of surface-plasmons. Eventually, it exhibits improved sensing performances compared to SPR based Schemes A and B. Consequently, it would turn out to be an appropriate candidate to detect a broad range of biological and chemical sample detection.
Highlights
The localized surface plasmon resonance (LSPR) phenomenon describes the propagation of the surface plasmons excited in nanoparticles or nanogratings whose size is smaller than that of the wavelength of the incident light
It is evident that the LSPR provides larger amplitude sensitivity which is nearly 1.15 times over SPR where the plasmons are merely generated in a localized region from the entire surface, which helps to achieve a sharper loss peak, as energy of the core-guided mode effectively interacts with the definite area of the surface
photonic crystal fiber (PCF)-RIBS has been demonstrated by LSPR and SPR response with optimized structural parameters for the biological and chemical detection
Summary
The localized surface plasmon resonance (LSPR) phenomenon describes the propagation of the surface plasmons excited in nanoparticles or nanogratings whose size is smaller than that of the wavelength of the incident light. The biological and chemical sensors based on SPR and LSPR with internal and external sensing of n a by different sensor configurations, namely, prism, grating, and fiber-based sensors have been investigated [1,2,3,4,5]. The change in n a affects the appropriate modes, and it eventually leads to the different loss spectra of the core-guided mode This phenomenon has been utilized to detect the analytes in the chemical and biological fields. When n a is higher than the fiber-material’s refractive index, the conventional total internal reflection is achieved We note that these fiber-based sensor geometries wherein the metallizing and filling of the fiber holes are necessary experience an exertion in real-time sensing.
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