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Highlights • Comparative performance study of mono- and bi-metallic plasmonic sensor. • Ag-Au is more stable and desirable with sensitivity, FWHM and FOM lying between Ag or Au based structure. • Sensitivity using both WS 2 and graphene is higher than single WS 2 or graphene layer. • The number of WS 2 layer is an important factor to affect the performance of the proposed sensor. • Simulation based sensing of glucose in Urine as a bio-sample is also presented. Abstract Theoretical investigation of special types of efficient nanoplasmonic sensors with monometallic and bimetallic Kretschmann configurations using silver and gold has been explored. Conventional Kretschmann structure has been modified using WS 2 or graphene for improving the performance of the sensor. We further show that incorporation of both WS 2 and graphene in the proposed structure is more advantageous. Some interesting theoretical results concerned with sensing of biological sample using this structure have also been presented. [ABSTRACT FROM AUTHOR]

Split Mach–Zehnder interferometer is proposed for demonstration of phase modulation of p- and s- polarized beams in a surface plasmon resonance based phase sensitive interference imaging platform. Significant phase change has been observed in Al coated prism based SPR configuration for p-polarized beam, whereas practically no phase change occurs for s-polarized beam. Qualitative analysis of SPR modulated interference fringes also validates the observed effects. A proposed Split Mach–Zehnder set up is shown for simultaneous sensing of two different samples. [ABSTRACT FROM AUTHOR]

We generate a nondiffracted Bessel beam using an axicon. A simple setup is presented to generate a zero order Bessel beam. Moreover, we introduce certain modifications in this optical setup for unconventional generation of an optical vortex beam using an axicon pair and a birefringent lens. An optical vortex beam with a topological charge of 1 is generated, and the corresponding spiral pattern has been demonstrated, which confirms the presence of orbital angular momentum in the optical vortex beam. Further, plasmonic excitation is validated using both zero order and first order Bessel beams. Our approach to confirm the presence of surface plasmon resonance relies on the use of a Wollaston prism. We are able to separately identify the coupling of surface plasmons with the p-polarized components via the absence of the corresponding annular beam. [ABSTRACT FROM AUTHOR]

We report a novel scheme for sensitivity-enhanced liquid phase cavity ring-down spectroscopy (CRDS) exploiting the two-dimensional transition metal dichalcogenides (2D-TMDCs) based surface plasmon resonance (SPR). We investigated the performance of the proposed sensing scheme by monitoring water isotopologues i.e. D 2 O (heavy water) and H 2 O on the SPR chip utilizing a simulation-based characteristics transfer matrix method. The cavity-enhanced SPR coupled with 2D-TMDCs is employed to detect D 2 O from distilled (DI) water with good time response. This proposed approach exhibited minimum sensitivity up to 448 ns/RIU with 4-layers of molybdenum disulfide (MoS 2) and maximum sensitivity up to​ 604 ns/RIU with 4-layers of tungsten diselenide (WSe 2). Moreover, dependence of cavity-finesse and chip-sensitivity on the 2D-nanomaterials suggests that SPR-CRDS is a new-strategy for the applications of plasmonic chemical sensing in the condensed phase with absorbance of the order of 10−11. • Coupling cavity ring-down spectroscopy and surface plasmon resonance with 2D-TMDC to probe condensed-phase molecules. • Performance of the proposed scheme was tested by monitoring various water isotopologues. • Various 2D materials were employed to increase the ring-down sensitivity. [ABSTRACT FROM AUTHOR]