Author
Bapita Roy
Other affiliations: Guru Nanak Institute of Technology, Techno India
Bio: Bapita Roy is an academic researcher from University of Calcutta. The author has contributed to research in topics: Surface plasmon polariton & Multi-mode optical fiber. The author has an hindex of 1, co-authored 5 publications receiving 4 citations. Previous affiliations of Bapita Roy include Guru Nanak Institute of Technology & Techno India.
Papers
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TL;DR: In this article, a compact, dielectric-metal-dielectric surface plasmon polariton (SPP) waveguide is designed that can have propagation lengths as high as several thousand microns.
Abstract: A compact, dielectric–metal–dielectric surface plasmon polariton (SPP) waveguide is designed that can have propagation lengths as high as several thousand microns. The dielectric layers surrounding the metal waveguide are actually periodic layers of different nanometer-sized dielectric pairs. By proper selection of the surrounding layer widths, a device with a controllable effective index and increased compactness can be designed. It can have a propagation loss
3 citations
TL;DR: In this paper, a segmented silicon based multimode to dual port slot structure on silicon-on-insulator platform is proposed which can be used as a refractive index sensing device.
Abstract: A segmented silicon based multimode to dual port slot structure on silicon-on-insulator platform is proposed which can be used as a refractive-index sensing device. The introduction of segmentation leads to tuning the effective index of the device which results in increasing compactness of the sensing device. Although the structure supporting TM mode is more compact than TE mode, but TE mode is considered here as vertical slots in the output section enhances optical signal in the slots for TE mode only. By considering dual output, the device length is reduced further as dual self-imaging length is less compared to single self-imaging distance for symmetrical multimode section input. The surface sensitivity of the structure has a typical value of∼2249 nm/RIU. Relative sensitivity can be calculated from the ratio of field amplitudes of the arms of the dual output. Matrix method and 2D FDTD is used for the entire analysis.
2 citations
TL;DR: It is shown that, when the single dielectric surrounding is replaced by a multilayered surrounding where each layer has different thicknesses and refractive index, the propagation loss gets reduced, leading to increased propagation length of the LR-SPP.
Abstract: A metal waveguide of finite width and thickness surrounded by a dielectric provides increased propagation length of the surface plasmon polariton and is therefore called long-range surface plasmon polaritons (LR-SPP). In this work, a new structure is proposed by modifying the refractive index of the dielectric surrounding the metal waveguide, leading to further improvement of the propagation length. It is shown that, when the single dielectric surrounding is replaced by a multilayered surrounding where each layer has different thicknesses and refractive index, the propagation loss gets reduced, leading to increased propagation length of the LR-SPP. The propagation loss is calculated semianalytically from the FWHM of the Lorentzian peak obtained in the plot of excitation efficiency of such waveguide for different values of the propagation constant. Before doing this calculation, the 2D variation of refractive index is first converted into a 1D effective refractive index. All the steps of analysis are discussed in detail, and, wherever necessary, the calculated results are matched with similar results of other researchers.
1 citations
TL;DR: In this article, the absorption loss has been studied for a metallic waveguide using matrix approach and effective refractive index has been calculated by solving dispersion relation, which is a matrix-based method.
Abstract: The characteristics of metallic waveguide have been investigated by matrix method. Effective refractive index has been calculated by solving dispersion relation. The absorption loss has been studied for a metallic waveguide using matrix approach.
15 Jun 2015
TL;DR: In this article, a multimode interference (MMI) based on self imaging phenomenon is investigated using matrixapproach using singlemode-multimode-singlemode and multimodesinglemodestructures of optical fiber.
Abstract: Multimode Interference (MMI) based on self imaging phenomenon is investigated using matrix
approach. Experimentally MMI is verified using singlemode-multimode-singlemode and multimodesinglemode
structures of optical fiber. The results obtained are also verified by BPM technique.
Cited by
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TL;DR: State-of-the-art plasmonic structures used for telecommunications applications are summarized and their distinctive roles on multiple approaches including beam steering, guiding, filtering, modulation, switching, and detection are discussed, which are all of prime importance for the development of the sixth generation (6G) cellular networks.
Abstract: Plasmonic materials, when properly illuminated with visible or near-infrared wavelengths, exhibit unique and interesting features that can be exploited for tailoring and tuning the light radiation and propagation properties at nanoscale dimensions. A variety of plasmonic heterostructures have been demonstrated for optical-signal filtering, transmission, detection, transportation, and modulation. In this review, state-of-the-art plasmonic structures used for telecommunications applications are summarized. In doing so, we discuss their distinctive roles on multiple approaches including beam steering, guiding, filtering, modulation, switching, and detection, which are all of prime importance for the development of the sixth generation (6G) cellular networks.
15 citations
TL;DR: In this paper, the authors proposed a high-performance refractive index sensor at a near-infrared band based on a hybrid Tamm structure using the transfer matrix method (TMM).
Abstract: In this paper, we propose a high-performance refractive-index sensor at a near-infrared band based on a hybrid Tamm structure. The optical properties of this graphene-based hybrid Tamm plasmonic structure are analyzed and investigated by using the transfer matrix method (TMM). Due to the excitation of the guide mode resonance (GMR) and Tamm plasmon polariton (TPP) resonance, the structure can realize multi-channel perfect absorption. This structure can be utilized as a refractive index sensor because the position of the absorption peak is sensitive to the refractive index of the ambient layer. Therefore, we obtain the sensitivity to 950 nm per refractive index unit (nm/RIU) and figure of merit (FoM) of 161 RIU-1 after studying the performance under different structural parameters. We believe that the proposed configuration is expected to be used to manufacture high-performance biosensors or gas sensor devices and other related applications in the near-infrared band.
11 citations
TL;DR: New promising sensor designs based on bimodal technology, which promises a significant increase in sensor sensitivity by means of equalizing the group delay of a pair of different optical modes propagating through the waveguide structure are paid.
Abstract: Silicon photonics is the most important technological platform for creating a variety of functional optical elements, including promising types of optical sensors. Moreover, in recent years, 20% of all publications on silicon photonics are devoted to the development of various versions of optical sensors. Their advantage steams from the combination of high technical parameters with the possibility of mass production using CMOS technology of microelectronics and nanophotonics. A brief description of various technological solutions of the last decade that provide progress in the development of optical sensor characteristics is given. Special attention is paid to new promising sensor designs based on bimodal technology, which promises a significant increase in sensor sensitivity by means of equalizing the group delay of a pair of different optical modes propagating through the waveguide structure. The review will be useful for domestic and foreign researchers working in the field of sensor development.
5 citations
TL;DR: In this article, a compact, dielectric-metal-dielectric surface plasmon polariton (SPP) waveguide is designed that can have propagation lengths as high as several thousand microns.
Abstract: A compact, dielectric–metal–dielectric surface plasmon polariton (SPP) waveguide is designed that can have propagation lengths as high as several thousand microns. The dielectric layers surrounding the metal waveguide are actually periodic layers of different nanometer-sized dielectric pairs. By proper selection of the surrounding layer widths, a device with a controllable effective index and increased compactness can be designed. It can have a propagation loss
3 citations
TL;DR: In this paper , the precise variation of self-imaging distance with width of a Gaussian input, centrally fed into a symmetric dielectric slab waveguide of width ∼20λ 0.
Abstract: We demonstrate the precise variation of self-imaging distance with width of a Gaussian input, centrally fed into a symmetric dielectric slab waveguide of width ∼20λ0. The width of the Gaussian is varied from the paraxial to completely nonparaxial domain. Unlike the paraxial case, the self-imaging distance is found to depend on the beam width and change with the number of excited modes in the waveguide. These features should be useful in designing devices that exploit self-imaging for improved efficiency, especially in nanophotonic circuits.
1 citations