We theoretically analyze waveguide coupled surface plasmon resonance structure to investigate the coupling phenomenon between waveguide resonance and plasmonic resonance. Variations of types of metals as well as changes of thickness of the waveguide layer produce some interesting phenomena in the context of coupled plasmonics. Different modes that are generated are found to have dual contributions of waveguide and plasmonic effects. Field enhancement and reflectance contour plots with simultaneous angular and wavelength interrogation give some insight into the effect of waveguide resonance on the performance of nanoplasmonic structure. Figure of merit calculations and comparison of angular and wavelength differential curves of different nanoplasmonic structures can be used to determine the right candidature as regarding the better sensing performance compared to conventional SPR based sensor. Moreover, the important role played by the thickness of the waveguide layer is also established with supporting simulations. © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE).

M BERA

M RAY

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Role of waveguide resonance in coupled plasmonic structures using bimetallic nanofilms

Optical Engineering

Numerical investigations of metal-dielectric-metal waveguide-coupled dual nanoresonator is demonstrated. Phase dependent resonant behavior along with its complex plane analysis is investigated in wavelength regime. Detailed analysis of the influence of the structural parameters on the resonance curve helps to determine the correct device parameters for different plasmonic applications. This waveguide-coupled plasmonic resonator can be utilized for chemical and biological sensing. In this context, figure of merit related to the asymmetric Fano line shape is redefined, incorporating both differential phase and quality (Q)-factor. Theoretical analysis of differential phase sensitivity in wavelength regime predicts the possibility of detection of refractive index change of the order of 10-8 RIU. © 2015 IEEE.

Journal of Lightwave Technology

Parametric analysis of spectral fano lineshape for plasmonic waveguide-coupled dual nanoresonator

A cost-effective simple technique to observe and analyze the surface plasmon resonance modulated radially sheared interference images using a birefringent lens (BL) is reported. Theoretical and experimental investigations have been presented for metallic thickness optimization, angle selection depending on the numerical aperture of BL, together with real and complex plane analysis of resonance parameters for better understanding of experimental results. Simultaneous observation of p- and s-polarizations using Wollaston prism also supports the modulation because of coupling of surface plasmons with p-polarization, whereas the unperturbed s-polarization can be used as reference. Moreover, we have also utilized this technique as the refractive index sensor for the analyte in contact with the plasmon generating metallic film. © 2015 Optical Society of America.

Journal of the Optical Society of America B: Optical Physics

Surface plasmon resonance mediated fringe modulation using a birefringent lens creating radial shearing environment

Metallic film thickness optimization in mono- and bimetallic plasmonic structures has been carried out in order to determine the correct device parameters. Different resonance parameters, such as reflectivity, phase, field enhancement, and the complex amplitude reflectance Argand diagram (CARAD), have been investigated for the proposed optimization procedure. Comparison of mono- and bimetallic plasmonic structures has been carried out in the context of these resonance parameters with simultaneous angular and spectral interrogation. Differential phase analysis has also been performed and its application to sensing has been discussed along with a proposed interferometric set-up. © 2014 © 2014 Taylor & Francis.

Journal of Modern Optics

Resonance parameters based analysis for metallic thickness optimization of a bimetallic plasmonic structure

Theoretical study of the reflectance response of an asymmetrically-clad bimetallic film that supports coupled surface plasmon polariton modes has been presented. Through adjusting the relative thickness of the two metal film components, the relative coupling strength to the long range (LR) and short range plasmon modes can be altered. It is possible to obtain optimal and equi coupling (zero reflectivity) to both modes for given incident wavelength by further adjusting the overall thickness of bimetallic film. Simultaneous angular and spectral sensitivity calculations of resonance of the LR mode have been demonstrated for sensing application. Tailoring of the structure of individual metal films realizing equi-and non-equi-reflectance modes has been proposed which may further be used for plasmonic trinary logic using binary di-bit images. © 2013 IEEE.

IEEE Photonics Technology Letters

Equi-reflectance dual mode resonance using bimetallic loaded dielectric plasmonic structure

Performance of several bimetallic multi-layer metallo-dielectric plasmonic structures has been analyzed three-dimensionally, along with their reflectance contour plots. Use of dielectric-metal-metal (DMM) and metal-dielectric-metal (MDM) blocks within a composite multilayer plasmonic structure is the main issue of this investigation, which has been validated by results incorporating variation of thickness of dielectric as well as choice of different metallic nanofilms. Resonance curves based on the Fresnel equations provide a comparative analysis as far as the detection accuracy is concerned. Three-dimensional resonance curves with simultaneous representation of angular and wavelength interrogation, along with reflectance contour plots with due consideration of the material dispersion, give some insight into the changes in coupling effect for different plasmonic resonant structures. Moreover, some interesting results are provided for thickness variation of the metal layer for two different configurations of bimetallic plasmonic structures. © 2012 Elsevier B.V.

Optics Communications

Parametric analysis of multi-layer metallo-dielectric coupled plasmonic resonant structures using homo and hetero-bimetallic nanofilms

Long-range and short-range surface plasmon resonance has been discussed for mono and bi-metallic coupled plasmonic structures. Reflectivity and field enhancement plots with simultaneous angular and wavelength interrogation along with the two dimensional (2D) contour plots provide significant information about the resonance phenomena in these two cases. Moreover, substrate and sample dependency help to choose the correct layer parameters for designing a nanoplasmonic sensor. © 2012 IEEE.

CODEC 2012 - 5th International Conference on Computers and Devices for Communication

Long-range and short-range surface plasmon resonance in coupled plasmonic structure using bimetallic nanofilms

In this paper, we report the theoretical analysis of different types of plasmonic structures with the main emphasis on the coupled plasmon waveguide resonance due to several advantages offered by the same compared to other structures. Multiple resonance dips are found to increase with the increase in the dielectric layer thickness and this progressive nature of the dips can be efficiently utilized to characterize the dielectric material within a composite multilayer plasmonic structure. Supporting simulation results carried out in the MATLAB environment are also provided to validate the proposed application. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

Coupled plasmonic assisted progressive multiple resonance for dielectric material characterization

In view of the increasing need for detection and analysis of chemical and biochemical substances in many important areas including medicine, environmental monitoring, biotechnology, drug and food monitoring, surface plasmon resonance (SPR) sensor technology holds a significant potential. An intermediate dielectric layer may be introduced between the glass prism and the thin metallic film to have a better precision in chemical sensors. In this paper we have studied and simulated various SPR curves in MATLAB environment, which further helps to determine certain optical properties, such as refractive index and thickness of homogeneous thin transparent films. Based on the proposed application of SPR to the sensor technology, our simulation results throw some insight into the sensitivity of detection and signature of various chemical/biological samples. In order to increase the precision, some supplementary procedural techniques have also been proposed to compensate for the minor errors during the measurement of a particular sensing parameter used in the SPR based bio/chemical sensor. © 2009 Optical Society of India.

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ISSN	0091-3286