Showing papers by "Rajib Chakraborty published in 2018"
TL;DR: In this article, a composite coating of hydroxyapatite and calcium hydrogen phosphate was synthesized over 316 l grade of stainless steel through pulsed electro deposition, and a detailed electrochemical behavior study was carried out to assess the corrosion behavior under contact with body fluid.
32 citations
TL;DR: In this paper, the surface morphology and electrochemical corrosion resistance behavior with respect to various depositions kinetics and nucleation mechanism achieved with the help of variable current density, voltage and time.
26 citations
TL;DR: In this article, a monomaterial-based resonator structure is proposed, which can replace the multilayer-based narrowband transmission filter, and the dependence of the filter action on the number of bilayers of two different effective refractive-index materials formed by etching and on the cavity region thicknesses is studied.
Abstract: A monomaterial-based resonator structure is proposed here, which can replace the multilayer-based narrowband transmission filter. This new concept of introducing the effect of multilayered structures of different materials into a single material is based on etching out repeatable structures of two different dimensions on the same material. As the etched-out repeatable structures are of different dimensions, it is possible to obtain periodic layers of two different-effective refractive indices. This type of monomaterial-based optical filters avoids the challenges generally faced while fabricating multilayer structures of different heterogeneous materials having different refractive indices. The dependence of the filter action on the number of bilayers of two different-effective refractive-index materials formed by etching and on the cavity region thicknesses is studied. Although the study is done mainly on lithium niobate on insulator, but it is seen that similar effects occur for materials of varying refractive indices.
5 citations
TL;DR: In this article, a waveguide-based structure on silicon on insulator platform is proposed for vertical integration in photonic integrated circuits, which consists of two multimode interference couplers connected by a single mode (SM) section.
Abstract: A waveguide based structure on silicon on insulator platform is proposed for vertical integration in photonic integrated circuits. The structure consists of two multimode interference couplers connected by a single mode (SM) section which can act as a bridge over any other underlying device. Two more SM sections acts as input and output of the first and second multimode couplers respectively. Potential application of this structure is in multilayered photonic links. It is shown that the efficiency of the structure can be improved by making some design modifications. The entire simulation is done using effective-index based matrix method. The feature size chosen are comparable to waveguides fabricated previously so as to fabricate the proposed structure easily.
2 citations
TL;DR: In this paper, a narrowband optical filter on Silicon-on-Insulator based on a directional coupler of continuous and periodic segmented waveguide is theoretically investigated, and it is shown that the filtering a...
Abstract: A narrowband optical filter on Silicon-on-Insulator based on a directional coupler of continuous and periodic segmented waveguide is theoretically investigated. The study shows that the filtering a...
1 citations