Publications

S. M. Tripathi, S. Kumari, K. Kundan, and N. Ahlawat. “Exceptional-point dynamics in photonic time crystals for enhanced optical sensing”. In: Physical Review Applied 25 (2026), p. 054054. doi: https://doi.org/10.1103/t58q-lmng.

S. M. Tripathi and N. Ahlawat. “Mode-engineered SMS fiber sensor with neural-network-based decoupling of strain and temperature”. In: Journal of the Optical Society of America B 43.8 (2026), pp. B110–B117. doi: https://doi.org/10.1364/JOSAB.595880.

N. Ahlawat and S. M. Tripathi. “Fiber Bragg Grating Sensors with Enhanced Sensitivity for High-Precision Multi-Parameter Detection.” arXiv (2025), arXiv:2509.22212[physics.optics].

R. K. M., B. Mohanta, S. M. Tripathi, P. K. Sarswat, and G. Kumar. “Terahertz Multiband Notch Filter Based on a Dielectric Topological Valley Photonic Crystal.” Journal of Applied Physics 138 (15) (2025), 153102. 

H. Singh and S. M. Tripathi. “Highly Sensitive B2O3-Doped Photonic Crystal Fiber Sensor for Fuel Adulteration Monitoring.” Journal of Optics (2025). DOI:10.1007/s12596-025-02884-4.

K. Dandapat, N. Saha, R. Dwivedi, S. M. Tripathi, and A. Kumar. “A Long-Period Waveguide Grating Sensor for Accurate Simultaneous Detection of Dual Analytes.” IEEE Sensors Journal 23 (7) (2023), pp. 7059–7067.

A. Koley and S. M. Tripathi. “Phase-Shifted Fiber Bragg Grating Filters Based on Counter-Propagating Cladding Modes Coupling.” Applied Optics 62 (32) (2023), pp. 8632–8641.

S. Kumari, Y. K. Verma, and S. M. Tripathi. “Plasmonic Ring Resonator Sensor With High Sensitivity and Enhanced Figure of Merit Using an Ag–Si–Ag Bus Waveguide.” IEEE Transactions on Nanotechnology 22 (2023), pp. 200–205.

Y. K. Verma, S. Kumari, and S. M. Tripathi. “Grating Assisted Temperature Insensitive Micro-Ring Resonator Biosensor.” Journal of Optics 25 (12) (2023), 125801.

G. Bawa and S. M. Tripathi. “Refractive Index Sensing Free From Critical Wavelength Referencing Using Fiber-Optic Directional Coupler.” Journal of Lightwave Technology 40 (1) (2022), pp. 284–290.

A. Koley and S. M. Tripathi. “Ultra-Narrow Linewidth Transmission Filters Based on the Cladding Mode Assisted Fabry–Perot Effect in a Planar Waveguide.” Applied Optics 61 (27) (2022), pp. 7889–7898.

S. Kumari, R. Singh, and S. M. Tripathi. “Parametric Optimization of Hybrid Plasmonic Waveguide-Based SOI Ring Resonator Refractive Index Sensor.” Plasmonics 17 (6) (2022), pp. 2417–2430.

S. Kumari and S. M. Tripathi. “Hybrid Plasmonic SOI Ring Resonator for Bulk and Affinity Bio-Sensing Applications.” Silicon 14 (17) (2022), pp. 11577–11586.

Y. K. Verma, S. Kumari, G. Bawa, and S. M. Tripathi. “Temperature Insensitive Large Free Spectral Range Micro-Ring Resonator.” Optical and Quantum Electronics 54 (12) (2022), 839.

K. Dandapat, I. Kumar, and S. M. Tripathi. “Ultrahigh Sensitive Long-Period Fiber Grating-Based Sensor for Detection of Adulterators in Biofuel.” Applied Optics 60 (24) (2021), pp. 7206–7213.

K. Dandapat and S. M. Tripathi. “Highly Sensitive Long-Period Fiber-Grating-Based Biosensor Inherently Immune to Temperature and Strain.” Journal of the Optical Society of America B 38 (12) (2021), pp. 3601–3607.

A. Koley and S. M. Tripathi. “Sensing Characteristics of Grating Assisted Counterpropagating Cladding Modes in Optical Fibers.” Applied Optics 60 (29) (2021), pp. 9129–9137.

D. K. Sharma and S. M. Tripathi. “Coupling Loss Attributes of Large Mode-Area Hexagonal Photonic Crystal Fibers in Presence of Misalignments: An Alternative Optical Model.” Optical and Quantum Electronics 53 (2021), pp. 1–25.

H. Singh, D. K. Sharma, and S. M. Tripathi. “Optical Attributes of Mode-Field Expansion in Solid-Core Hexagonal Microstructured Optical Fibers.” Optical Fiber Technology 61 (2021), 102457.

Y. K. Verma and S. M. Tripathi. “Simultaneous Temperature and Humidity Insensitive Race Track Ring Resonator Using Silicon and Titanium Dioxide Waveguides in Cavity.” Results in Optics 5 (2021), 100176.

G. Bawa, I. Kumar, and S. M. Tripathi. “Simultaneous Existence of Ultrahigh and Ultralow Spectral Sensitivity for Directional Couplers.” IEEE Sensors Letters 4 (10) (2020), pp. 1–4.

R. Dwivedi, A. Kumar, and S. M. Tripathi. “Ultra High Sensitive Refractive Index Sensor Using a Metal Under-Clad Ridge Waveguide Modal Interferometer Near the Dispersion Turning Point.” IEEE Sensors Journal (2020), pp. 4674–4681.

A. Mishra, K. Dandapat, S. M. Tripathi, P. Lohia, and D. Dwivedi. “Modelling and Analysis of Chirped Long-Period Grating Inscribed in a Planer Optical Waveguide Structure for Sensing Applications.” Journal of Optical Communications(2020).

D. K. Sharma and S. M. Tripathi. “Chalcogenide Glass Microstructured Optical Fiber as a Potential Candidate for Slow-Light Generation via Stimulated Brillouin Scattering.” Journal of Non-Crystalline Solids 542 (2020), 120114.

D. K. Sharma and S. M. Tripathi. “Synopsis on Optical Attributes of Chalcogenide Glass Solid-Core Hexagonal Microstructured Optical Fibers in Infrared Regime.” Materials Chemistry and Physics 243 (2020), 122632.

D. K. Sharma and S. M. Tripathi. “Theoretical Implications for Surface Plasmon Resonance Based on Microstructured Optical Fiber.” Progress in Optomechatronics (2020), pp. 43–52.

G. Bawa, K. Dandapat, G. Kumar, and I. K. S. Tripathi. “Single-Multi-Single Mode Fiber Optic Structure-Based Water Depth Sensor.” IEEE Sensors Journal 19 (16) (2019), pp. 6756–6762.

D. K. Sharma, A. Sharma, and S. M. Tripathi. “Optimum Splicing of High-Index Core Microstructured Optical Fibers and Traditional Single-Mode Fibers Using Improved Field Model.” Optics & Laser Technology 109 (2019), pp. 157–167.

D. K. Sharma and S. M. Tripathi. “Analysis of the Beam Divergence for One-Rod Core Microstructured Optical Fibres.” Opto-Electronics Review 27 (2) (2019), pp. 224–231.

D. K. Sharma and S. M. Tripathi. “Implications of Theoretical Analysis to Explore the Functional Core Dimension in One-Rod Core Microstructured Optical Fibers.” Optical and Quantum Electronics 51 (10) (2019), 318.

D. K. Sharma and S. M. Tripathi. “Optical Performance of Tellurite Glass Microstructured Optical Fiber for Slow-Light Generation Assisted by Stimulated Brillouin Scattering.” Optical Materials 94 (2019), pp. 196–205.

D. K. Sharma and S. M. Tripathi. “Splicing of Silica-Based MOF and Standard SMF: Loss Evaluation Using an Enhanced Field Model.” Optical Fiber Technology 53 (2019), 102030.

D. K. Sharma and S. M. Tripathi. “Theoretical Analysis for Exploring the Optical Performance of Solid-Core Polymer Based Microstructured Optical Fibers.” Physica B: Condensed Matter 572 (2019), pp. 279–290.

D. K. Sharma, S. M. Tripathi, and A. Sharma. “Modal Analysis of High-Index Core Tellurite Glass Microstructured Optical Fibers in Infrared Regime.” Journal of Non-Crystalline Solids 511 (2019), pp. 147–160.

S. M. Tripathi, K. Dandapat, W. Bock, P. Mikulic, J. Perreault, and B. Sellamuthu. “Gold Coated Dual-Resonance Long-Period Fiber Gratings (DR-LPFG) Based Aptasensor for Cyanobacterial Toxin Detection.” Sensing and Bio-Sensing Research 25 (2019), 100289.

D. K. Sharma, A. Sharma, and S. M. Tripathi. “Thermo-Optic Characteristics of Hybrid Polymer/Silica Microstructured Optical Fiber: An Analytical Approach.” Optical Materials 78 (2018), pp. 508–520.

D. K. Sharma, A. Sharma, and S. M. Tripathi. “Characteristics of Solid-Core Square-Lattice Microstructured Optical Fibers Using an Analytical Field Model.” Optics & Laser Technology 96 (2017), pp. 97–106.

D. K. Sharma, A. Sharma, and S. M. Tripathi. “Cladding Mode Coupling in Long-Period Gratings in Index-Guided Microstructured Optical Fibers.” Applied Physics B: Lasers and Optics 123 (2017).

D. K. Sharma, A. Sharma, and S. M. Tripathi. “Microstructured Optical Fibers for Terahertz Waveguiding Regime by Using an Analytical Field Model.” Optical Fiber Technology 39 (2017), pp. 55–69.

D. K. Sharma, A. Sharma, and S. M. Tripathi. “Optical Characteristics of Polymer-Infused Microstructured Optical Fiber Using an Analytical Field Model.” Optik - International Journal for Light and Electron Optics 140 (2017), pp. 1–9.

S. M. Tripathi, W. J. Bock, and P. Mikulic. “A Wide-Range Temperature Immune Refractive-Index Sensor Using Concatenated Long-Period-Fiber-Gratings.” Sensors and Actuators B: Chemical 243 (2017), pp. 1109–1114.

K. Dandapat, S. M. Tripathi, Y. Chinifooroshan, W. Bock, and P. Mikulic. “A Compact and Cost-Effective Temperature Insensitive Bio-Sensor Based on Long Period Fiber Gratings for Accurate Detection of E. coli Bacteria in Water.” Optics Letters 41 (2016), pp. 4198–4201.

M. Kumar, A. Kumar, and S. M. Tripathi. “Optical Waveguide Biosensor Based on Modal Interference Between Surface Plasmon Modes.” Sensors and Actuators B: Chemical 211 (2015), pp. 456–461. DOI: https://doi.org/10.1016/j.snb.2015.01.088

M. Kumar, A. Kumar, and S. M. Tripathi. “A Comparison of Temperature Sensing Characteristics of SMS Structures Using Step and Graded Index Multimode Fibers.” Optics Communications 312 (2014), pp. 222–226.

S. M. Tripathi, A. Kumar, M. Kumar, and W. J. Bock. “Temperature Insensitive Single-Mode-Multimode-Single-Mode Fiber Optic Structures with Two Multimode Fibers in Series.” Optics Letters 39 (2014), pp. 3340–3343.

R. Garg, S. M. Tripathi, K. Thyagarajan, and W. J. Bock. “Long Period Fiber Grating Based Temperature-Compensated High Performance Sensor for Bio-Chemical Sensing Applications.” Sensors and Actuators B: Chemical 176 (2013), pp. 1121–1127.

S. M. Tripathi, W. J. Bock, A. Kumar, and P. Mikulic. “Temperature Insensitive High-Precision Refractive-Index Sensor Using Two Concatenated Dual-Resonance LPGs.” Optics Letters 38 (2013), pp. 666–668.

G. Yan, A. Markov, Y. Chinifooroshan, S. M. Tripathi, W. J. Bock, and M. Skorobogatiy. “Low-Loss THz Waveguide Bragg Grating Using a Two-Wire Waveguide and a Paper Grating.” Optics Letters 38 (2013), pp. 3089–3092.

G. Yan, A. Markov, Y. Chinifooroshan, S. M. Tripathi, W. J. Bock, and M. Skorobogatiy. “Resonant THz Sensor for Paper Quality Monitoring Using THz Fiber Bragg Gratings.” Optics Letters 38 (2013), pp. 2200–2202.

S. M. Tripathi, W. J. Bock, P. Mikulic, R. Chinnappan, A. Ng, M. Tolba, and M. Zourob. “Long Period Grating Based Biosensor for High-Precision Detection of Escherichia coli Bacteria.” Biosensors and Bioelectronics 35 (2012), pp. 308–312.

S. M. Tripathi, A. Kumar, M. Kumar, and W. J. Bock. “Temperature Insensitive Fiber Optic Devices Using Multimode Interference Effect.” Optics Letters 37 (2012), pp. 4570–4572.

U. Tiwari, S. M. Tripathi, K. Thyagarajan, M. R. Shenoy, V. Mishra, S. C. Jain, N. Singh, and P. Kapur. “Tunable Wavelength Division Multiplexing Channel Isolation Filter Based on Dual Chirped Long-Period Fiber Gratings.” Optics Letters 36 (2011), pp. 3747–3749.

S. M. Tripathi, A. Kumar, E. Marin, and J.-P. Meunier. “Critical Wavelength in the Transmission Spectrum of SMS Fiber Structure Employing GeO2 Doped Multimode Fiber.” IEEE Photonics Technology Letters 22 (2010), pp. 799–801.

S. M. Tripathi, A. Kumar, E. Marin, and J.-P. Meunier. “Highly Sensitive Miniaturized Refractive Index Sensor Based on Au-Ag Surface Gratings on a Planar Optical Waveguide.” IEEE-OSA Journal of Lightwave Technology 28 (2010), pp. 2469–2476.

S. M. Tripathi, A. Kumar, E. Marin, and J.-P. Meunier. “Single-Multi-Single Mode Structure Based Band Pass/Stop Fiber Optic Filter with Tunable Bandwidth.” IEEE-OSA Journal of Lightwave Technology 28 (2010), pp. 3535–3541.

S. M. Tripathi, A. Kumar, E. Marin, and J.-P. Meunier. “Bragg Grating Based Biochemical Sensor Using Submicron Si/SiO2 Waveguides for Lab-on-a-Chip Applications: A Novel Design.” Applied Optics 48 (2009), pp. 4562–4567.

S. M. Tripathi, A. Kumar, E. Marin, and J.-P. Meunier. “Refractive Index Sensing Characteristics of Dual Resonance Long Period Gratings in Bare and Metal-Coated D-Shaped Fibers.” Applied Optics 48 (2009).

S. M. Tripathi, A. Kumar, R. Varshney, Y. Kumar, E. Marin, and J.-P. Meunier. “Strain and Temperature Sensing Characteristics of Single-Mode–Multimode–Single-Mode Structures.” IEEE-OSA Journal of Lightwave Technology 27 (2009), pp. 2348–2356.

S. M. Tripathi, A. Kumar, E. Marin, and J.-P. Meunier. “Side-Polished Optical Fiber Grating Based Refractive Index Sensors Utilizing the Pure Surface Plasmon Polariton.” IEEE-OSA Journal of Lightwave Technology 26 (2008), pp. 1980–1985.

I. Kumar, R. Dwivedi, and S. M. Tripathi. “Ultra-high Sensitive Surface Plasmon Resonance Based Sensor with Dual Resonance.” arXiv (2020). arXiv:2007.02039.

Parth Joshi and S. M. Tripathi. “Reciprocal Exceptional-Point Dynamics in Fiber Bragg Gratings via Passive Auxiliary-Mode Elimination.” Frontiers in Optics + Laser Science (FiO+LS 2026), Rochester, New York, USA, 27 September–1 October 2026.

S. Kumari, K. Kundan, N. Ahlawat, and S. M. Tripathi. “Ultra-Sensitive Optical Sensing Using Exceptional Points in Photonic Time Crystals.” CLEO: Conference on Lasers and Electro-Optics 2026, Charlotte, NC, USA, 17–21 May 2026.

N. Ahlawat and S. M. Tripathi. “Twist-Induced Chirality in Fiber Bragg Gratings for Tunable Multi-Band Reflectivity.” Frontiers in Optics + Laser Science Conference (FiO+LS 2025), Denver, Colorado, USA, 26–30 October 2025.

Neha and S. M. Tripathi. “Modal Interference Effect in Plasmonic Waveguides and Their Application as Bio-Sensors.” Photonics Middle East 2024 Conference, Dubai, UAE, 19–22 April 2024.

S. M. Tripathi and Neha. “Refractometry Using Plasmonic Mode Interference in Degenerate n-Doped Si Waveguide.” Conference on Lasers and Electro-Optics (CLEO 2024), Charlotte, North Carolina, USA, 5–10 May 2024.

Neha and S. M. Tripathi. “Refractometry Using Plasmonic Mode Interference in Degenerate n-Doped Si Waveguide.” International Conference on Optics, Photonics and Quantum Information, KUSAT, Kochi, Kerala, India, 11–13 December 2023.

G. Bawa and S. M. Tripathi. “Bio-Layer Sensing Using Directional Coupler Based Modal Interferometer.” Frontiers in Optics + Laser Science 2022 (FiO+LS 2022), Technical Digest Series, Optica Publishing Group, 2022, Paper JW4A.83.

S. Kumari, Y. K. Verma, and S. M. Tripathi. “Plasmonic Ring Resonator Glucose Sensor with Reduced Full Width at Half Maximum.” Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2022), Technical Digest Series, Optica Publishing Group, 2022, Paper PCTu807.

Y. K. Verma, S. Kumari, and S. M. Tripathi. “Refractometry Using Large Index Contrast Narrow Width Micro-Ring Resonator.” 2022 Workshop on Recent Advances in Photonics (WRAP), Mumbai, India, 2022, pp. 1–2. DOI: 10.1109/WRAP54064.2022.9758344.

Y. K. Verma, S. Kumari, and S. M. Tripathi. “Athermal Micro-Ring Resonator with Large Free Spectral Range Using Wide Ring Waveguide.” 2022 IEEE 19th India Council International Conference (INDICON), India, 2022.

G. Bawa, N. Saha, and S. M. Tripathi. “Integrated Optical Directional Coupler Based Refractive Index Sensor.” OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), OSA Technical Digest, Optica Publishing Group, 2021, Paper JTh6A.2.

G. Bawa and S. M. Tripathi. “Reference Wavelength Free Refractometry in Fiber Optic Directional Couplers.” Conference on Lasers and Electro-Optics (CLEO 2021), OSA Technical Digest, Optica Publishing Group, 2021, Paper JW1A.84.

A. Koley and S. M. Tripathi. “Wavelength Filter Properties of Optical Waveguide Bragg Grating Fabry-Perot Cavity Employing Counter-Propagating Cladding Modes.” XIV Annual Symposium of the Optical Society of India: Frontiers in Optics and Photonics (FOP21), IIT Delhi, New Delhi, India, 24–27 September 2021.

H. Singh, D. K. Sharma, and S. M. Tripathi. “Implications on Mode-Field Expansion in Microstructured Optical Fiber.” Workshop on Theoretical and Numerical Tools for Nanophotonics, India, 2020.

N. Ahlawat, A. Pandey, and S. M. Tripathi. “Plasmonic Mode Interference Effect Based Sensors.” IEEE Photonics Journal 16 (5) (2024), pp. 1–9.

G. Bawa, N. Saha, Y. K. Verma, and S. M. Tripathi. “Critical Wavelength Referencing Free Biosensor Using Silicon-on-Insulator-Based Directional Coupler.” IEEE Sensors Journal 24 (2024), pp. 36937–36945.

A. Koley and S. M. Tripathi. “Bi-Directional High-Order Orbital Angular Momentum Mode Generation Using Gratings in High Numerical Aperture Fiber.” Journal of Optics (2024).

A. Koley and S. M. Tripathi. “Birefringence Free Spectral Tuning of Bragg Grating Based Fabry-Pérot Resonator in LiNbO3 Waveguide Employing Counter-Propagating Cladding Modes.” IEEE Journal of Quantum Electronics 60 (2024), pp. 1–8.

S. Kumari, Y. K. Verma, and S. M. Tripathi. “Plasmonic Ring Resonator Sensor with High Figure of Merit and Sensitivity Using Degenerate n-Doped Silicon for SPP Excitation.” Plasmonics 19 (2024), pp. 2743–2751.

H. Singh and S. M. Tripathi. “Cost-Effective Ethanol Sensor Utilising Inherent Mode-Transition in Photonic Crystal Fiber.” Photonics and Nanostructures – Fundamentals and Applications 58 (2024), 101236. 

Y. K. Verma and S. M. Tripathi. “Ultra-Narrow Linewidth Micro-Ring Resonator for Optical Notch Filter and Methane Sensing Applications.” Journal of Optics 53 (2024), pp. 4631–4639.