A Study of Sensitivity Improved Probe Using Hyperbolic Metamaterial for Optical Fiber SPR (OFSPR)-based Refractive Index Sensor

Dubey, Sarvesh K.; Kumar, Anil; Pandey, Amritanshu; Pathak, Amit; Srivastava, Sanjay

doi:10.1007/s11468-022-01619-6

Cited by 4 publications

(4 citation statements)

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“…Coupling of these two modes significantly narrowed the linewidth and further increased the near-surface electric field intensity. In comparison with the conventional gold film structure and some outstanding plasmonic sensors [27,28,30,[32][33][34][35][36][37], FOM of the proposed structure reaches 5417/RIU in bulk sensing owing to the narrow linewidth of 8 nm, which is far better than that mentioned. The enhanced electric field of the PWR-HMM sensor was tightly bound to the HMM upper surface, where the surface electric field intensity is improved by 2 times and 20% compared with the PWR and PWR-NP structures in the NIR, respectively.…”

Section: Discussionmentioning

confidence: 80%

“…In comparison with sensors based on metal-graphene [33], ring resonator [34], grating [35], concentric-rings resonator [36], and metal-dielectric-metal [37] in the NIR, the proposed sensor has a much higher FOM, which is conducive for improving the accuracy and resolution of the resonance wavelength. As shown in table 2, we compared the proposed structure with some recently reported configurations containing HMMs in simulation [27,28,30,32]. In the visible region, the q = 2 mode of the proposed structure has lower sensitivity and slightly higher FOM.…”

Section: Resultsmentioning

confidence: 99%

“…The proposed sensor have two modes for sensing from visible to the near-infrared region (NIR). In addition, compared with the conventional gold film structure and some outstanding plasmonic sensors [27,28,30,[32][33][34][35][36][37], the FOM of the proposed structure reaches 5417/RIU in bulk sensing owing to a narrow linewidth of 8 nm, which is far better than that mentioned. In comparison with PWR, the surface electric field intensity and the surface sensitivity of PWR-HMM increase by four and two times, respectively, in NIR.…”

Section: Introductionmentioning

confidence: 85%

“…Mulitilayer HMMs are often used to enhance the bulk refractive index sensitivity [18,22], surface-enhanced Raman scattering [23,24], and optical perfect absorbers [25,26], and have a strong ability to enhance electric field. In addition, HMMs also have a wide range of applications in improving optical fiber sensing performance [27][28][29][30][31][32]. Plasma can be excited by different interfaces of the multilayer HMM, and the coupling of plasma modes can further enhance the electric field intensity.…”

Section: Introductionmentioning

confidence: 99%

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Coupling plasmon-waveguide resonance and multiple plasma modes in hyperbolic metamaterials for high-performance sensing

Wang¹,

Wang²,

Yan³

et al. 2022

Nanotechnology

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A sensor based on plasmon-waveguide resonance (PWR) exhibits an impressive narrow linewidth and has attracted extensive attention in plasmon label-free sensing. However, the low surface electric field intensity limits the detection ability of biomolecules, where the refractive index changes are restricted at the sensor surface. In this study, we study the coupling of PWR and multiple plasma modes in a hyperbolic metamaterial (HMM), combining narrow line width and electric field enhancement advantages. The PWR-HMM sensor includes a gold film, lossless dielectric layer, and metal/dielectric multilayer HMM array composed of 2-layer Au/Al2O3 stacks. The evanescent field of PWR is used to excite multiple plasma modes in the HMM. The figure of merit of the proposed structure reaches 5417 /RIU owing to the existence of lossless dielectric layer, which is 11.7 times than the conventional gold film structure. The maximum bulk sensitivity of the PWR-HMM sensor was 43,000 nm/RIU. In comparison with PWR, the surface electric field intensity and the surface sensitivity of PWR-HMM increase by four and two times, respectively. Furthermore, comparing the sensing performance of the PWR-HMM sensor and PWR-nanoparticle (NP) sensor (coupling PWR and localized surface plasmon resonance), it was found that PWR-HMM has 20% higher surface sensitivity than the PWR-NP. A sensing mechanism coupling PWR and multiple plasma modes in the HMMs opens a gate to significantly improve the PWR sensors performance, which is expected to be used to resolve urgent issues in biological, medical and clinical applications.

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