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.

S PAUL

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

Parametric Analysis of Spectral Fano Lineshape for Plasmonic Waveguide-Coupled Dual Nanoresonator

Journal of Lightwave Technology

Quantum interference effects, namely Fano resonance producing asymmetric resonant excitation and plasmon-induced transparency (PIT), are demonstrated in a plasmonic waveguide-coupled resonator device incorporated with a third-order Kerr nonlinear medium. Occurrence of both Fano and induced transparency peaks is modulated by alteration of the nonlinear permittivity through an external control beam and the phenomenon is further utilized to investigate optical switching in the plasmonic device. Simultaneous switching at multiple wavelengths is explored using Fano and PIT effect and the multispectral optical switching at four or more wavelengths is employed for proposed realization of trinary logic operations. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

Plasmonics

Multispectral Switching Using Fano Resonance and Plasmon-Induced Transparency in a Plasmonic Waveguide-Coupled Resonator System

Dual and multiple asymmetric Fano resonance are theoretically explored in a subwavelength plasmonic cavity-coupled waveguide system incorporated with a third order Kerr nonlinear medium. The degree of asymmetry and the number of multiple resonances are controlled by an external pump beam which modulates the Kerr permittivity thereby dictating the resonant behavior. Electromagnetically induced transparency in plasmonic systems, referred to as plasmon induced transparency, is a special case of Fano resonance and plays a key role for the occurrence of multiple Fano excitations. Plasmon induced transparency appears as induced reflectance dips when analyzed in reflection mode. Though geometrical dependency of dual and multiple Fano effect is demonstrated, the main interest and importance is focused on the generation and manipulation of multiple Fano resonances by intensity modulation of the pump beam and its application in multispectral switching and quality factor tuning at a fixed operating frequency. © 2018 Author(s).

Fulltext

Journal of Applied Physics

Nonlinearity modulation based multiple Fano resonance and multi-spectral switching in a nanoplasmonic waveguide-coupled cavity system

Plasmon-induced transparency, an effect analogous to electromagnetically induced transparency in atomic systems, is investigated theoretically in a plasmonic waveguide-coupled resonator device. Transmittance peak is induced through modulation of an external control beam, which alters the nonlinear optical response of a third-order Kerr medium incorporated within the structure. This induced transparency is utilized to achieve optical switching simultaneously at two wavelengths. At higher intensities, an induced peak exhibiting Fano resonant feature enables demonstration of simultaneous switching at three wavelengths. The performance of the switch is evaluated by determining the differential transmittance at the switching wavelengths. © 2017 IEEE.

IEEE Photonics Technology Letters

Simultaneous Switching at Multiple Wavelengths Using Plasmon Induced Transparency and Fano Resonance

We have proposed a plasmonic nanosensor comprising of metal-dielectric-metal subwavelength waveguide coupled to nanocavities. The nanosensor provides excellent sensitivity and higher Figure of Merit compared to other recently reported cavity based plasmonic waveguide systems. The high sensitivity results from direct coupling between the nanocavities leading to coupled resonator induced transparency which is similar to the electromagnetically induced transparency commonly seen in quantum plasmonic systems. © 2015 IEEE.

2015 6th International Conference on Computers and Devices for Communication, CODEC 2015

Coupled resonator induced transparency leading to plasmonic nanosensing with high detection efficiency

Numerical analysis of subwavelength metal–dielectric–metal waveguide perpendicularly coupled to a single nanostub, which is also a dielectric cavity embedded in a metallic medium, is demonstrated using the concept of transmission line theory. The transmission of the optical field is explained in terms of impedance matching and phase response in wavelength regime. Asymmetric nature of the spectral line shape has also been explained by complex plane investigation. Detailed study related to the influence of structural parameters on the resonant line shape has been carried out in order to facilitate proper choice of device parameters for different nanoplasmonic applications. Application of the device as an optical switch is also demonstrated. Incorporation of an active material within the stub and excitation by an optical pump provides the on–off switching mechanism. Certain physical parameters have been defined for performance evaluation of this switch, and switching efficiency has been evaluated in terms of these parameters considering operation at different infrared wavelengths. © 2015, Springer-Verlag Berlin Heidelberg.

Applied Physics A: Materials Science and Processing

Analysis of plasmonic subwavelength waveguide-coupled nanostub and its application in optical switching

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.

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

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

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

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.

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

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