Dr Akhilesh Pathak
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About
Overview
Akhilesh Kumar Pathak (Senior Member, IEEE and OPTICA) received the master’s degree in physics from the University of Allahabad, Allahabad, India, in 2012, and the Ph.D. degree in fiber optics and photonics from the Indian Institute of Technology (Indian School of Mines), Dhanbad, India, in 2019. During his doctoral studies, he was awarded the Erasmus Mundus Leaders Fellowship, which enabled him to conduct part of his research at City University of London, London, U.K. After completing his Ph.D., he worked as a Postdoctoral Fellow at Chulalongkorn University, Bangkok, Thailand, from 2020 to 2022, and later as a Research Associate at Northwestern University, USA, from 2023 to 2025. He has authored more than 50 publications, including international journal articles, conference papers, and book chapters. His research interests include optical fiber modeling using the full-vectorial finite-element method (FV-FEM), fs laser densification, 3D printing of optical waveguides using two-photon polymerization, synthesis and controlled growth of nanoparticles, hydrogels, and specialized optically active materials lasing applications.
Publications
Featured publications
- Pathak, A.K., Kulkarni, S.P., Aydin, K. and Krishnaswamy, S. (2025). Triple-Doped Rare-Earth Nanoemitters for Two-Photon 3D Printing of Chip-Scale Polymer Optical Waveguide Amplifiers. ACS Applied Nano Materials, 8(50), pp. 23891-23899. doi:10.1021/acsanm.5c04017
- Kumar Pathak, A., Swargiary, K. and Viphavakit, C. (2025). SPR-Enhanced Detection of Isopropanol Vapor Using Au/MIP-Coated Optical Fiber Sensor. IEEE Sensors Journal, 25(16), pp. 30743-30750. doi:10.1109/jsen.2025.3585846
- Swargiary, K., Thaneerat, S., Kongsawang, N., Pathak, A.K. and Viphavakit, C. (2025). Highly sensitive and real-time detection of acetone biomarker for diabetes using a ZnO-coated optical fiber sensor. Biosensors and Bioelectronics, 271, pp. 117061-117061. doi:10.1016/j.bios.2024.117061
- Kulkarni, S.P., Pathak, A.K., Krishnaswamy, S. and Aydin, K. (2025). High-Q Emission from Colloidal Quantum Dots Embedded in Polymer Quasi-BIC Metasurfaces. Nano Letters, 25(4), pp. 1653-1659. doi:10.1021/acs.nanolett.4c05817
- Pathak, A.K., Kulkarni, S.P., Chan, R.R., Mirkin, C.A., Aydin, K. and Krishnaswamy, S. (2025). Surface‐Functionalization of Oleate‐Capped Nano‐Emitters for Stable Dispersion in 3D‐Printable Polymers. Advanced Functional Materials, 35(1). doi:10.1002/adfm.202412064
Publications by category
Book
- Krishnaswamy, S., Pathak, A.K. and Viphavakit, C. (2025). Photonic Sensors for Detection of VOC Biomarkers Technological Principles and Medical Applications. Elsevier Health Sciences. ISBN 9780443291661.
Chapters (3)
- Verma, S., Sakda, N., Pathak, A.K., Cabrera, F.J. and Rahman, B.M.A. (2026). Design and optimization of low-dimensional photonic devices. Low-Dimensional Materials, Systems and Applications, Volume 1 (pp. 23-60). Elsevier. ISBN 9780443248047.
- (2025). Volatile organic compound sensing: Conventional to advanced approaches. In Advances in Clinical Chemistry (pp. 271-318). Elsevier. ISBN 9780443429996.
- Gangwar, R.K., Pathak, A.K., Qin, J. and Wang, X. (2023). Physics of photonic crystals and applications. Modern Luminescence from Fundamental Concepts to Materials and Applications (pp. 313-327). Elsevier. ISBN 9780323899543.
Conference papers and proceedings (16)
- Pathak, A.K., Kulkarni, S., Krishnaswamy, S., Rizzo, P., Su, Z., Ricci, F.... Peters, K.J. (2024). Two-photon 3D printed active polymer ring resonators on the tip of optical fibers for temperature sensing. Health Monitoring of Structural and Biological Systems XVIII 25-29 March.doi:10.1117/12.3010972
- Pathak, A.K., Kulkarni, S., Krishnaswamy, S., Rizzo, P., Su, Z., Ricci, F.... Peters, K.J. (2024). Fiber-optic temperature sensor based on embedded rare-earth luminescent nanoparticles. Health Monitoring of Structural and Biological Systems XVIII 25-29 March.doi:10.1117/12.3010975
- Jitpratak, P., Pathak, A.K., Swargiary, K. and Viphavakit, C. (2023). Molecular Imprinted Polymer on Optical Fiber Sensor for Ethanol Vapor Biomarker Detection. 2023 IEEE SENSORS 29 October-1 November.doi:10.1109/sensors56945.2023.10324956
- Leelasirinuwong, M., Denkasineecharoen, P., Yungyuentrrakoon, P., Jitpratak, P., Kongsawang, N., Pathak, A.K.... Viphavakit, C. Molecular Imprinted Polymer Based Optical Sensor for Methanol Vapor Detection. .doi:10.1364/HMISE.2023.JW2A.9
- Leelasirinuwong, M., Denkasineecharoen, P., Yungyuentrrakoon, P., Jitpratak, P., Kongsawang, N., Pathak, A.K.... Viphavakit, C. Molecular Imprinted Polymer Based Optical Sensor for Methanol Vapor Detection. .
- Leelasirinuwong, M., Denkasineecharoen, P., Yungyuentrrakoon, P., Jitpratak, P., Kongsawang, N., Pathak, A.K.... Viphavakit, C. (2023). Molecular Imprinted Polymer Based Optical Sensor for Methanol Vapor Detection. Applied Industrial Spectroscopy.doi:10.1364/ais.2023.jw2a.9
- Chauhan, M., Pathak, A.K., Khanikar, T. and Singh, V.K. (2019). A side-polished macro bend fiber sensor for the efficient Detection of petrol adulteration. 2019 Workshop on Recent Advances in Photonics (WRAP) 13-14 December.doi:10.1109/wrap47485.2019.9013694
- Khanikar, T., Pathak, A.K. and Singh, V.K. (2019). Micro-channeled Single Mode Fiber Plasmonic Sensor with ITO-TiO2 Bilayer. 2019 Workshop on Recent Advances in Photonics (WRAP) 13-14 December.doi:10.1109/wrap47485.2019.9013657
- Pathak, A.K., Khanikar, T. and Singh, V.K. (2018). U-bend optical fiber pH sensor using multiple sol-gel coating over TiO<inf>2</inf>. 2018 3rd International Conference on Microwave and Photonics (ICMAP) 9-11 February.doi:10.1109/icmap.2018.8354501
- Singh, V.K. and Pathak, A.K. (2018). Tapered multi-mode optical fiber sensor to detect petrol adulteration. Optics and Photonics for Energy and the Environment.doi:10.1364/ee.2018.em2a.1
- Pathak, A.K. and Singh, V.K. (2017). U Shaped Fiber-Optic pH Sensor Using Sol-gel Coating Over TiO2. Frontiers in Optics.doi:10.1364/fio.2017.jtu2a.51
- Pathak, A.K., Bhardwaj, V., Gangwar, R.K. and Singh, V.K. SPR based cone tapered fiber optic chemical sensor for the detection of low water in ethanol. INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics.doi:10.1063/1.4946067
- Bhardwaj, V., Gangwar, R.K., Pathak, A.K. and Singh, V.K. Uncladded sensing fiber for refractive index measurement. INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics.doi:10.1063/1.4946072
- Pathak, A.K., De, M., Bhardwaj, V., Gangwar, R.K. and Singh, V.K. (2016). Hetro core optical Fiber Sensor for concentration measurement. International Conference on Fibre Optics and Photonics.doi:10.1364/photonics.2016.tu4a.10
- Pathak, A.K., Bhardwaj, V., Gangwar, R.K. and Singh, V.K. (2015). SPR based fiber sensor to measure refractive index of glycerol and acetone. 2015 International Conference on Microwave and Photonics (ICMAP) 11-13 December.doi:10.1109/icmap.2015.7408711
- Pathak, A.K., Pathak, V., Gurcha, S.S., Besra, G.S. and Reynolds, R.C. Disaccharides as photoaffinity probes for arabinosyl and galactosyl transferase activities in Mycobacterium tuberculosis.. .
Journal articles (32)
- Jammee, R., Jitpratak, P., Panda, A., Uerchuchai, P., Trakarnvanich, P., Pathak, A.K.... Viphavakit, C. (2026). Surface functionalization of optical fibers with PDDA-stabilized AuNPs for enhanced interfacial stability in sensing applications. Results in Engineering, 29, pp. 108664-108664. doi:10.1016/j.rineng.2025.108664
- Panda, A., Kumar Pathak, A. and Viphavakit, C. (2024). A Highly Sensitive H-Shaped Optical Fiber Sensor for Monitoring Blood Glucose Level. IEEE Sensors Journal, 24(15), pp. 23764-23772. doi:10.1109/jsen.2024.3410548
- Gangwar, R.K., Pathak, A.K., Chiavaioli, F., Abu Bakar, M.H., Kamil, Y.M., Mahdi, M.A.... Singh, V.K. (2024). Optical fiber SERS sensors: Unveiling advances, challenges, and applications in a miniaturized technology. Coordination Chemistry Reviews, 510. doi:10.1016/j.ccr.2024.215861
- Verma, S., Pathak, A.K. and Rahman, B.M.A. (2024). Review of Biosensors Based on Plasmonic-Enhanced Processes in the Metallic and Meta-Material-Supported Nanostructures. Micromachines, 15(4), pp. 502-502. doi:10.3390/mi15040502
- Gangwar, R.K., Pathak, A.K. and Kumar, S. (2023). Recent Progress in Photonic Crystal Devices and Their Applications: A Review. Photonics, 10(11), pp. 1199-1199. doi:10.3390/photonics10111199
- Swargiary, K., Jitpratak, P., Pathak, A.K. and Viphavakit, C. (2023). Low-Cost ZnO Spray-Coated Optical Fiber Sensor for Detecting VOC Biomarkers of Diabetes. Sensors, 23(18), pp. 7916-7916. doi:10.3390/s23187916
- Gangwar, R.K., Kumari, S., Pathak, A.K., Gutlapalli, S.D. and Meena, M.C. (2023). Optical Fiber Based Temperature Sensors: A Review. Optics, 4(1), pp. 171-197. doi:10.3390/opt4010013
- Kumari, S., Pathak, A.K., Gangwar, R.K. and Gupta, S. (2023). Performance Analysis of SiGe-Cladded Silicon MMI Coupler in Presence of Stress. Computation, 11(2), pp. 34-34. doi:10.3390/computation11020034
- Pathak, A.K., Gangwar, R.K., Chaudhary, S., Kumari, S. and Kumar, S. (2023). Editorial: Advanced photonic devices and sensing systems. Frontiers in Photonics, 4. doi:10.3389/fphot.2023.1153760
- Pathak, A.K., Verma, S., Sakda, N., Viphavakit, C., Chitaree, R. and Rahman, B.M.A. (2023). Recent Advances in Optical Hydrogen Sensor including Use of Metal and Metal Alloys: A Review. Photonics, 10(2), pp. 122-122. doi:10.3390/photonics10020122
- Pathak, A., Swargiary, K., Kongsawang, N., Jitpratak, P., Ajchareeyasoontorn, N., Udomkittivorakul, J.... Viphavakit, C. (2023). Recent Advances in Sensing Materials Targeting Clinical Volatile Organic Compound (VOC) Biomarkers: A Review. Biosensors, 13(1), pp. 114-114. doi:10.3390/bios13010114
- Pathak, A.K., Limprapassorn, P., Kongruttanachok, N. and Viphavakit, C. (2022). Molecularly Imprinted Polymer-Based Optical Sensor for Isopropanol Vapor. Journal of Sensor and Actuator Networks, 11(3), pp. 46-46. doi:10.3390/jsan11030046
- Pathak, A.K., Rahman, B.M.A. and Viphavakit, C. (2022). Nanowire Embedded Micro-Drilled Dual-Channel Approach to Develop Highly Sensitive Biosensor. IEEE Photonics Technology Letters, 34(13), pp. 707-710. doi:10.1109/lpt.2022.3182783
- Pathak, A.K. and Viphavakit, C. (2022). A review on all-optical fiber-based VOC sensors: Heading towards the development of promising technology. Sensors and Actuators A: Physical, 338, pp. 113455-113455. doi:10.1016/j.sna.2022.113455
- Rahman, B.M.A., Viphavakit, C., Chitaree, R., Ghosh, S., Pathak, A.K., Verma, S.... Sakda, N. (2022). Optical Fiber, Nanomaterial, and THz-Metasurface-Mediated Nano-Biosensors: A Review. Biosensors, 12(1), pp. 42-42. doi:10.3390/bios12010042
- Pathak, A.K. and Viphavakit, C. (2021). VOC Biomarker Monitoring for Diabetes Through Exhaled Breath Using Ag/P-TiO2 Composite Plasmonic Sensor. IEEE Sensors Journal, 21(20), pp. 22631-22637. doi:10.1109/jsen.2021.3104766
- Pathak, A., Viphavakit, C., Rahman, B.M.A. and Singh, V. (2021). A Highly Sensitive SPR Refractive Index Sensor Based on Microfluidic Channel Assisted With Graphene-Ag Composite Nanowire. IEEE Photonics Journal, 13(2), pp. 1-8. doi:10.1109/jphot.2021.3069396
- Pathak, A.K. and Singh, V.K. (2020). SPR Based Optical Fiber Refractive Index Sensor Using Silver Nanowire Assisted CSMFC. IEEE Photonics Technology Letters, 32(8), pp. 465-468. doi:10.1109/lpt.2020.2980470
- Pathak, A.K. and Singh, V.K. (2020). Theoretical assessment of D-shaped optical fiber chemical sensor associated with nanoscale silver strip operating in near-infrared region. Optical and Quantum Electronics, 52(4). doi:10.1007/s11082-020-02316-6
- Pathak, A.K., Ghosh, S., Gangwar, R.K., Rahman, B.M.A. and Singh, V.K. (2019). Metal Nanowire Assisted Hollow Core Fiber Sensor for an Efficient Detection of Small Refractive Index Change of Measurand Liquid. Plasmonics, 14(6), pp. 1823-1830. doi:10.1007/s11468-019-00969-y
- Pathak, A.K., Singh, V.K., Ghosh, S. and Rahman, B.M.A. (2019). Investigation of a SPR based refractive index sensor using a single mode fiber with a large D shaped microfluidic channel. OSA Continuum, 2(11), pp. 3008-3008. doi:10.1364/osac.2.003008
- Pathak, A.K., Rahman, B.M.A., Singh, V.K. and Kumari, S. (2019). Sensitivity Enhancement of a Concave Shaped Optical Fiber Refractive Index Sensor Covered with Multiple Au Nanowires. Sensors, 19(19), pp. 4210-4210. doi:10.3390/s19194210
- De, M., Pathak, A.K. and Singh, V.K. (2019). Single channel photonic crystal fiber based high sensitive petrol adulteration detection sensor. Optik, 183, pp. 539-546. doi:10.1016/j.ijleo.2019.03.001
- Pathak, A.K., Chaudhary, D.K. and Singh, V.K. (2018). Broad range and highly sensitive optical pH sensor based on Hierarchical ZnO microflowers over tapered silica fiber. Sensors and Actuators A: Physical, 280, pp. 399-405. doi:10.1016/j.sna.2018.08.013
- Pathak, A.K. and Singh, V.K. (2018). Investigations on sensing properties of tapered photonic crystal fiber refractive index sensor. Indian Journal of Pure and Applied Physics, 56(5), pp. 373-378
- Khanikar, T., Pathak, A.K. and Singh, V.K. (2018). Reflectance-based no core fiber sensor with enhanced Sensitivity for salinity detection. Optik, 159, pp. 1-8. doi:10.1016/j.ijleo.2018.01.053
- Pathak, A.K. and Singh, V.K. (2017). A wide range and highly sensitive optical fiber pH sensor using polyacrylamide hydrogel. Optical Fiber Technology, 39, pp. 43-48. doi:10.1016/j.yofte.2017.09.022
- Pathak, A.K. and Singh, V.K. (2017). Fabrication and characterization of down-tapered optical fiber pH sensor using sol-gel method. Optik, 149, pp. 288-294. doi:10.1016/j.ijleo.2017.09.051
- Pathak, A.K., Gangwar, R.K., Priyadarshini, P. and Singh, V.K. (2017). A robust optical fiber sensor for the detection of petrol adulteration. Optik, 149, pp. 43-48. doi:10.1016/j.ijleo.2017.09.036
- Gangwar, R.K., Pathak, A.K., Priyadarshani, P. and Singh, V.K. (2017). Effect of ethanol infiltration on the zero dispersion wavelength of solid core photonic crystal fiber. Optik, 147, pp. 197-203. doi:10.1016/j.ijleo.2017.08.037
- Bhardwaj, V., Pathak, A.K. and Singh, V.K. (2017). No-core fiber-based highly sensitive optical fiber pH sensor. Journal of Biomedical Optics, 22(5), pp. 057001-057001. doi:10.1117/1.jbo.22.5.057001
- Pathak, A.K., Bhardwaj, V., Gangwar, R.K., De, M. and Singh, V.K. (2017). Fabrication and characterization of TiO 2 coated cone shaped nano-fiber pH sensor. Optics Communications, 386, pp. 43-48. doi:10.1016/j.optcom.2016.11.021
Professional activities
Editorial activity
- Journal of Sensors, Wiley, Academic Editor.