Faculty Publications
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Publications by NITK Faculty
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Item Nanoscale Tapered Hybrid Plasmonic Waveguide for On-Chip Silicon Photonics(Springer Science and Business Media B.V., 2022) Reddy, S.K.; Singh, M.Plasmonic waveguides which deploy surface plasmon-polariton (SPP) waves are of colossal interest to the researchers with their ability to realize and integrate nanophotonic circuits beyond the diffraction limit. In order to subjugate the demerits of plasmonic and dielectric waveguides, the light guided by plasmonic and dielectric waveguides are coupled to form hybrid plasmonic waveguide (HPWG). In this work, we have simulated a nanoscale tapered plasmonic waveguide (Au-SiO2-Si) using COMSOL Multiphysics software in the telecommunication C-band. The proposed waveguide shows better normalized effective mode area (Aeff/A= 0.056), enhanced electric field confinement, and long propagation length (Lp = 101.55 μm) with h= 350 nm, WAu = 100 nm, WSlot=20 nm, WSi = 220 nm, and ht=150 nm. The finite element method based approach shows that this enounced waveguide is a feasible choice for the future on-chip nanophotonic devices. © 2021, Springer Nature B.V.Item Temperature Detection Using Plasmonic Waveguide Ring Resonator: Design and Analysis(Institute of Electrical and Electronics Engineers Inc., 2024) Nausheen, T.A.; Nikhilesh Kumar, C.; Khanna, A.; Singh, M.A 3-D-hybrid plasmonic waveguide (HPWG) cascaded ring resonator-based temperature sensor is studied in the infrared (IR) spectral regime. The proposed design achieves high sensitivity and precision in temperature measurements by integrating the unique properties of plasmonic and photonics. The HPWG enhances the interaction between the optical field and the surrounding environment, while the cascaded ring resonators provide a compact and efficient means of modulating the optical signal in response to temperature changes. Our theoretical analysis and numerical simulations demonstrate that the device exhibits a significant shift in resonance wavelength with temperature variations, leading to an enhanced sensitivity (0.37 nm/K) compared to traditional photonic sensors. The potential applications of this temperature sensor span various fields, including environmental monitoring, biomedical diagnostics, and industrial process control. It offers a promising solution for advanced temperature sensing with improved performance and miniaturization. © 1973-2012 IEEE.Item Phase Noise Reduction in Optoelectronic Oscillator With Quadratic Fiber Bragg Grating Dispersion Engineering(Institute of Electrical and Electronics Engineers Inc., 2025) Renuka, B.; Singh, M.This article presents the design, implementation, and performance analysis of an optoelectronic oscillator (OEO) incorporating a quadratic fiber Bragg grating (Q-FBG). Integrating Q-FBG in OEO architecture introduces enhanced filtering capabilities and precise frequency control, which are critical for applications requiring high stability and low phase noise. It provides a tailored reflection spectrum, enabling improved mode selection and reduced spurious tones. Experiments confirm oscillator’s superior performance metrics, including phase noise reduction and frequency stability. Theoretical modeling and simulation corroborate the experimental results, confirming the Q-FBG’s effectiveness in optimizing OEO performance. An error vector magnitude (EVM) of 2.5% is obtained for the generated signal, indicating high quality and improved modulation accuracy of the microwave signal. The uncertainty of measurement, particularly the standard deviation in EVM values, is analyzed to assess system reliability. The potential applications of the proposed OEO include telecommunications, radar systems, and precision measurement instruments. The study underscores the significant advantages of incorporating Q-FBG in OEOs and paves the way for further advancements in microwave photonics technology. © 1963-2012 IEEE.