Resonance response of waveguide-coupled surface plasmon resonance (WCSPR) structure is investigated numerically in a piecewise manner. The 2-D reflectance and phase along with the phase response circle (PRC) and complex amplitude reflection Argand diagram in angular interrogation is demonstrated for homo-and hetero bimetallic nanofilm. The gradual appearance of waveguide resonance with increasing thickness of the waveguide layer provides significant information about the coupling of waveguide and plasmonic resonance which is much needed for the choice of correct device parameters. Moreover, magnetic field enhancement is also studied for each different mode in angular piecewise manner with variations in metal layers as well as variations in WG layer using different conventional optical polymers. Angular piecewise differential phase gives some insight into the application of chemical and biological sensing and can provide an improved sensitivity by direct imaging of the fringe pattern due to the change in refractive index of the sensing medium. © 2014 IEEE.

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

Angular Piecewise Modal Analysis for Waveguide-Coupled Surface Plasmon Resonance Structure

Journal of Lightwave Technology

A novel scheme of surface plasmon resonance-assisted Fresnel-zone-like moiré pattern generation has been theoretically and experimentally investigated in a dual shearing environment. Lateral shear is followed by radial shear with the help of a Wollaston prism and a birefringent lens, respectively. The superposition of two contrastreversed Fresnel-zone-like patterns (FZP) with parallel equi-spaced straight lines interestingly generates the displaced replication of the original FZP, particularly when the lateral shear is of a sufficient amount. Modulation due to plasmonic excitation has also been observed on such patterns for two different substrate materials. Binary representation of radially sheared images has been illustrated and further utilized for the proposed non-contact surface profilometry of metal coatings. © 2016 Optical Society of America.

Journal of the Optical Society of America B: Optical Physics

Fresnel-zone-like moirÃ© patterns: Optical generation and plasmonic modulation with proposed surface profilometry application

A novel surface plasmon resonance (SPR)-mediated Moire fringe generation is theoretically and experimentally investigated using a birefringent lens (BL) and a Wollaston prism. Birefringent lens having two longitudinally shifted focal points provides radial shear, whereas Wollaston prism introduces lateral shear between the two radially sheared patterns for mutual orthogonal polarizations. Thus Moire-like pattern is produced at the overlapping region of those patterns. Brief theory and experimental demonstration of coherent and incoherent Moire fringe generation by such dual shearing is presented. The appearance and disappearance of Moire pattern with the rotation of the analyzer axis has also been demonstrated. A modified experimental setup has also been developed to observe the influence of plasmonic excitation on such patterns which can be further utilized for photonic applications such as sensing and imaging. (C) 2015 Optical Society of America

Optics Letters

Moire pattern generation by dual shearing and its modulation by surface plasmon resonance

A novel surface plasmon resonance (SPR)-mediated Moiré fringe generation is theoretically and experimentally investigated using a birefringent lens (BL) and a Wollaston prism. Birefringent lens having two longitudinally shifted focal points provides radial shear, whereas Wollaston prism introduces lateral shear between the two radially sheared patterns for mutual orthogonal polarizations. Thus Moiré-like pattern is produced at the overlapping region of those patterns. Brief theory and experimental demonstration of coherent and incoherent Moiré fringe generation by such dual shearing is presented. The appearance and disappearance of Moiré pattern with the rotation of the analyzer axis has also been demonstrated. A modified experimental setup has also been developed to observe the influence of plasmonic excitation on such patterns which can be further utilized for photonic applications such as sensing and imaging. © 2015 Optical Society of America.

MoirÃ© pattern generation by dual shearing and its modulation by surface plasmon resonance

Theoretical and experimental investigation of surface plasmon resonance (SPR) assisted radially sheared interference imaging using a birefringent lens having two longitudinally shifted focal points has been reported. As Wolllaston prism can introduce lateral shear between the two mutual orthogonal polarizations of radially sheared pattern, Moiré-like pattern is produced at overlapping region of those patterns. Brief theory and experimental demonstration of coherent and incoherent Moiré fringe generation has been done. Surface plasmon resonance (SPR) mediated Moiré pattern has been demonstrated which can be further utilized for other nanophotonic applications. © 2015 Copyright SPIE.

Proceedings of SPIE - The International Society for Optical Engineering

Generation of MoirÃ© pattern and its modulation by surface plasmon resonance

A new scheme of variable thickness ladder-like stepped metal film for simultaneous excitation of surface plasmon resonance (SPR) with different wavelength based on modified three layer Kretschmann configuration has been proposed. Metal thickness has been optimized for four different wavelengths ranging from visible to near infrared. The thickness has also been optimized for different substrates as well as different metal films in order to show the dependency of the substrate and metal layers on the ultimate performance of the plasmonic structure. A new concept of Reflectance Constrained Dynamic Range has been employed and its value has been calculated numerically and graphically for each SPR structure under consideration and for each wavelength considering water as reference sample and using the optimized metal thickness. Electric field enhancement has been evaluated for different structures and the full width half maximum has also been calculated for four working wavelengths in order to study the field confinement and measurement accuracy. Longer wavelength provides larger dynamic range and better measurement precision, which is desirable for biochemical sensing. Moreover, this multi-channel ladder-like stepped metallic structure can also be utilized for simultaneous sensing of different samples. © 2015 AIP Publishing LLC.

Fulltext

Journal of Applied Physics

Simultaneous excitation of multi-spectral surface plasmon resonance using multi-stepped-thickness metallic film

In this paper, two types of nanoplasmonic structures, namely multilayer metallo-dielectric and multilayer-swapped metallo-dielectric structures have been analyzed in context of phase jumps and related phenomena due to the positional swap in the metallo-dielectric block. Phase, reflectivity, and field enhancement plots are also discussed in the angular and wavelength regime. Detailed analysis using circular phase response along with the angled histogram of the phase for both structures provides significant understanding of this swapping phenomenon. Parametric analysis of the metallo-dielectric block has also been demonstrated. Figure of merit defined in complex plane also gives some insight into the performance of the structures. © Springer Science+Business Media New York 2013.

Plasmonics

Circular phase response-based analysis for swapped multilayer metallo-dielectric plasmonic structures

Analysis of the transmission spectrum of a silicon microring resonator (also known as whispering gallery resonator) coupled to a straight waveguide is reported. The transmittance depends on wavelength of operation as well as on the gap distances between the resonator and the waveguide. It is observed that at certain wavelengths the value of transmittance becomes identical for various gap distances and this gap-independence of the transmission spectrum is seen to be repeated at periodic interval of wavelengths. Moreover, the effect of gap-distance on the quality factor of the waveguide-coupled ring resonator is discussed along with supporting simulation results. © 2012 Optical Society of India.

Journal of Optics (India)

Periodically repeated gap-independent transmission in waveguide coupled microring Whispering Gallery Resonators (WGR)

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.

Journal	Data powered by TypesetJournal of Lightwave Technology
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
ISSN	0733-8724