Browsing by Author "Yogendra Kumar Prajapati"

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Design of a Photonic Crystal Fiber for Dispersion Compensation and Sensing Applications Using Modified Air Holes of the Cladding
(Springer New York LLC, 2019) Yogendra Kumar Prajapati; Rahul Kumar; V. Singh
High birefringence and high negative dispersion with minimum confinement loss of an octagonal photonic crystal fiber is proposed using modified air holes of the cladding. This analysis indicates that the proposed photonic crystal fiber design near to square air holes provides higher 0.245 birefringence and higher − 722.48 ps/(nm × km) negative dispersion with confinement loss of 0.117 dB/km at 1.55-μm wavelength. The obtained results like birefringence and negative dispersion are high in proposed octagonal photonic crystal fiber in comparison with circular air hole–based octagonal photonic crystal fiber. Further, the proposed photonic crystal fiber is utilized for ethanol sensing, and it is observed that relative sensitivity and confinement loss are 16.97% and 4.97 × 10−3 dB/km, respectively. Hence, the proposed fiber is best suitable for application in dispersion compensation, polarization-maintaining, and sensing. Such fiber structure can easily be designed by slightly changing the structural parameter during fiber drawing. © 2019, Sociedade Brasileira de Física.
Forward and backward wave propagation in multilayer planar waveguide using metamaterials layer
(2013) Divya Sharma; Alka Verma; Yogendra Kumar Prajapati; Vivek Singh; Jai Prakash Saini
In this study, an efficient method is discussed to analyze the multilayer planar waveguides with double negative guided (DNG) and double positive material as guiding film. Here, among various lossless multilayer planar waveguide structures, only three layer and five layer structures are discussed. For these structures, guided dispersion characteristic, along with electric field distribution of TM modes are numerically analyzed and compared. This analysis enables an effective comparison of guided modal properties of various modes and results in a better understanding of the multilayer planar waveguide with DNG as guiding film. © 2012 Springer Science+Business Media, LLC.
On the Feasibility of Thallium Bromide in Long-Range Plasmonic Sensing for Enhancement of Performance
(Institute of Electrical and Electronics Engineers Inc., 2024) Virendra Kumar; Sarika Pal; Vivek Singh; Bela Goyal; Lalit Kumar Awasthi; Yogendra Kumar Prajapati
This article introduces a new plasmonic sensor utilizing long range surface plasmon resonance (LRSPR), which is constructed from a heterostructure of thallium bromide (TlBr) along with BluePhosphorene and Tungsten diselenide (BlueP/WSe2). Through meticulous analysis, we systematically investigated the optimal sensor configuration which consists of 8 nm thick silver (Ag) metal layer, a 1900 nm thick Magnesium fluoride (MgF2) dielectric buffer laye (DBL), and a 2-nm thick TlBr layer to enhance the capabilities of the sensor. The achieved configuration of he proposed sensor claims exceptional attributes, including narrower full width at half maximum (FWHM =0.01 Deg.), higher detection accuracy [DA =100 (Deg-1)], imaging figure of merit [IFOM =4410500 (Deg. RIU)-1], imaging sensitivity, (Simg. =44 105 RIU-1), and angular figure of merit (FOMang. =5814.38$ RIU-1). It exhibits significantly improved performance by achieving 38.02, 964.89, 25.39, and 61.40-times higher values of DA, IFOM, Simg., and FOMang respectively, as compared to the conventional surface plasmon resonance (CSPR) sensor. Furthermore, the penetration depth (PD) of 989.45 nm of the proposed LRSPR sensor surpasses the PD (210.01 nm) of CSPR sensors, and demonstrates precise and sensitive refractive index (RI) sensing applications in biomedical. Consequently, the proposed sensor offers superior performance over existing LRSPR sensors. © 1973-2012 IEEE.