Publications

"There are no limits to what you can accomplish, except the limits you place on your own thinking"Brian Tracy

Patents

Patents Granted/Published

Inventors: Biswajit Pathak and Suyash Mehta

“A Method and Device for Increasing Imaging Speed in Fourier Ptychography Microscopy System Using Grating Patterns”, Application No.: 202541086041, Application Date: 10/09/2025, Publication Date: 03/10/2025, Publication Number: 40/2025 [Indian Patent, Published].

Inventors: Biswajit Pathak and Bosanta R. Boruah

“A Method and Device for Zonal Wavefront Sensing via Sequential Spatially Shifted Grating Array Patterns”, Application No.: 3752/DEL/2014, Patent No.: 510388, Grant Date: 13/02/2024 [Indian Patent, Granted].

Inventors: Bosanta R. Boruah, Alika Khare, Biswajit Pathak and Rahul Kesarwani

“System and Method for Monitoring of Surface Profile and Thickness Measurement in Thin Films”, Application No.: EP16872494.6A, Patent No.: EP3387482 , Grant Date: 16/11/2022 [European Patent, Granted].

Inventors: Biswajit Pathak and Bosanta R. Boruah

“A Method and Device for Zonal Wavefront Sensing by Beam Splitting”, Application No.: 3935/DEL/2014, Patent No.: 406347, Grant Date: 12/09/2022 [Indian Patent, Granted].

Inventors: Bosanta R. Boruah, Alika Khare, Biswajit Pathak and Rahul Kesarwani

“System, Apparatus And Method for Monitoring of Surface Profile and Thickness Measurement in Thin Films”, Application No.: 4088/DEL/2015, Patent No.: 403113, Grant Date: 05/08/2022 [Indian Patent, Granted].

Inventors: Bosanta R. Boruah, Alika Khare, Biswajit Pathak and Rahul Kesarwani

“Systems, Equipment, and Methods for Monitoring Surface Profile and / or Thickness Measurements on Thin Films”, Application No.: JP,2018-549636, Patent No.: JP6838075B2, Grant Date: 15/02/2021 [Japanese Patent, Granted].

Patent Applied

Inventors: Bosanta R. Boruah, Alika Khare, Biswajit Pathak and Rahul Kesarwani

“System, Apparatus and Method for Monitoring of Surface Profile and Thickness Measurement in Thin Films”, PCT Application No.: PCT/IB2016/054261, Publication No.: WO2017098343A1.

Book Chapter

Biswajit Pathak et al., Medical Image Understanding and Analysis "Simultaneous Optimisation of Confocal and Non-confocal Images in an AOSLO with a Reconfigurable Aperture Pattern" ISBN 978-3-030-52791-4, Pages 410-419, Springer International Publishing (2020).

Journals & Proceedings

Biswajit Pathak, Jaspal Singh, C. S. Narayanamurthy and A. R. Ganesan, “Zonal Wavefront Sensing Using a Grating Array Without Reference Wavefront”, Optics Letters, Vol. 50(21), 6798 - 6801 (2025).

Anitta Jomy, Amritha Jayan, C. S. Narayanamurthy, Dinesh N. Naik and Biswajit Pathak, “Hybrid Holographic Modal Wavefront Sensing for Improved Aberration Correction”, Optics Letters, Vol. 50(12), 4066-4069 (2025).

Suyash Mehta and Biswajit Pathak, “Fourier Ptychography Microscopy with Programmable Beam Illumination”, Optics Express, Vol. 33(5), 12071-12089 (2025) [Media Coverage].

Jaspal Singh*, Biswajit Pathak*, C. S. Narayanamurthy and A. R. Ganesan, “Multiplexed Wavefront Sensing Using Grating Array-Based Wavefront Sensor ”, Optics Express, Vol. 33(3), 4437-4445 (2025) [*these authors contributed equally].

Deepak K. Jaduvanshi, Biswajit Pathak and C. S. Narayanamurthy, “Design and Implementation of a Diffraction-Based Common-Path Digital Holographic Microscopy System with Programmable Beams”, Optik: International Journal for Light and Electron Optics, Vol. 331, 172352 (2025).

A. Jomy, S. Mehta, J. Jacob, S. Anirudh, D. K. Krishna, R. Kumar, J. Gondhalekar, C. K. Adheena, M. Jeevan, M. S. Akshay, N. Mohan, C. S. Narayanamurthy, and B. Pathak, “Experimental Arrangement to Study the Impact of Atmospheric Turbulence on User-Defined Beams”, Review of Scientific Instruments, Vol. 96(1), 015109 (2025).

Suyash Mehta, Emi Susan Shine, Goutham, A. S. and Biswajit Pathak, “Fourier Ptychography Microscopy with Multi-plane Adaptive Illumination”, Proceedings of SPIE, 13717 1371719 (2025).

Suyash Mehta, Aryan Chand, Jasmine Paul, Chaitanya Malviya and Biswajit Pathak, “High-speed Confocal Imaging with Programmable Multi-beam Scanning”, Proceedings of SPIE, 13717 1371718 (2025).

Anitta Jomy, Amritha Jayan, Dinesh N. Naik and Biswajit Pathak, “Development of Improved Holographic Modal Wavefront Sensor”, Optica Imaging Congress, Technical Digest Series, Optica Publishing Group, JW2A.5 (2025).

Jaspal Singh, Biswajit Pathak, C. S. Narayanamurthy and A. R. Ganesan, “Single-shot Multiple Wavefront Sensing in Kolmogorov Turbulence”, Proceedings of SPIE, 13619 13619Z (2025).

Srivathsav Karnati and Biswajit Pathak, “Analysis of Biospeckle Pattern Using Grey-Level and Color-Channel Assessment Methods”, Laser Physics (IOP), Vol. 34(10), 105601 (2024).

Biswajit Pathak, Jaspal Singh, C. S. Narayanamurthy and A. R. Ganesan, “Implementation of Reference-less Wavefront Sensing in a Grating Array-Based Wavefront Sensor”, Proceedings of SPIE, 13149 13149J (2024).

Biswajit Pathak, “Multiplexed Grating Array Based Zonal Wavefront Sensor”, Proceedings of SPIE, 12910 129100P (2024).

Biswajit Pathak, et al., “Shack–Hartmann Wavefront Sensing Using Printed Liquid Crystal Microlens Arrays”, Proceedings of SPIE: PC12907 PC129070Q (2024).

Biswajit Pathak, et al., “Speckle Reduction in Interferometry Using Tuneable Liquid Crystal Diffusers”, Proceedings of SPIE: PC12907, PC129070R (2024).

Deepak K. Jaduvanshi, C. S. Narayanamurthy and Biswajit Pathak, “Accurate Phase Reconstruction in Digital Holography Microscopy Using Fresnel Biprism”, Proceedings of SPIE: 12852, 128520S (2024).

Jaspal Singh, Laxman Mandal, Biswajit Pathak, C. S. Narayanamurthy and A. R. Ganesan, “Anisoplanatic Effects on Wave Propagation Through Dynamic Pseudo-Random Phase Plate Mimicking Atmospheric Turbulence”, Optics Communications, Vol. 557, 130360 (2024).

Biswajit Pathak, “Simultaneous Realisation of Zonal and Modal Wavefront Sensing Using Programmable Multiplexed Grating Patterns”, Optics Express, Vol. 30(11), 17953-17966 (2022) [selected as Editor's Pick].

Nagendra Kumar, Biswajit Pathak, Rahul Kesarwani, Sumit Goswami, Alika Khare and Bosanta R. Boruah, “Experimental Demonstration of In-situ Surface and Thickness Profile Measurement of Thin Film During Deposition Using a Grating Array Based Wavefront Sensor”, Optics Letters, Vol. 47(21), 5509-5512 (2022).

Biswajit Pathak, et al., “Compressed Imaging with Focused Light”, Journal of Optics (IOP), Vol. 24(6), 065301 (2022).

Biswajit Pathak, et al., “Computational Super-Resolution Imaging with Multimode Fiber Using Optimized Illuminations”, Proceedings of SPIE: 11937 1193707 (2022).

Biswajit Pathak, “Accurate Aberration Compensation Using Programmable Multiplexed Grating Patterns”, Digital Holography and Three-Dimensional Imaging, Technical Digest Series, Optica Publishing Group, Th3A.3 (2022).

Biswajit Pathak, “Improved Wavefront Estimation Accuracy in a Programmable Grating Array Based Wavefront Sensor”, Journal of Optics (IOP), Vol. 23(4), 045604 (2021).

Biswajit Pathak, “An Improved Programmable Grating Array Based Wavefront Sensor”, Proceedings of SPIE: 11817 118170R (2021).

Biswajit Pathak, “Simultaneous Direct and Indirect Wavefront Sensing Using Multiplexed Programmable Grating Patterns”, Proceedings of SPIE: 11817 118170Q (2021).

Biswajit Pathak and Bosanta R. Boruah, “A Zonal Wavefront Sensor with Multiple Detector Planes”, Journal of Optics (IOP), Vol. 20(3), 035604 (2018).

Biswajit Pathak and Bosanta R. Boruah, “Improvement in Error Propagation in the Shack-Hartmann type Zonal Wavefront Sensors”, Journal of Optical Society of America A, Vol. 34(12), 2194-2202 (2017).

Biswajit Pathak and Bosanta R. Boruah, “Zonal Wavefront Sensing with Enhanced Spatial Resolution”, Optics Letters, Vol. 41(23), 5600-5603 (2016).

Biswajit Pathak and Bosanta R. Boruah, “Investigation of Algorithm Discretization Error in a Zonal Wavefront Estimation Process”, Proceedings of SPIE: 9739 973916 (2016).

Biswajit Pathak and Bosanta R. Boruah, “Binary Hologram Based High Speed Zonal Wavefront Sensing with Reduced Estimation Time”, Proceedings of SPIE: 9741 97410T (2016).

Biswajit Pathak, Suraj Kumar and Bosanta R. Boruah, “Zonal Wavefront Sensing Using a Grating Array Printed on a Polyester Film”, Review of Scientific Instruments, Vol. 86(12), 125002 (2015).

Biswajit Pathak and Bosanta R. Boruah, “Reduction in the Amount of Crosstalk with Reduced Number of Focal Spot Rows in a Grating Array Based Zonal Wavefront Sensor”, Proceedings of SPIE: 9654 965414 (2015).

Biswajit Pathak and Bosanta R. Boruah, “Improved Wavefront Reconstruction Algorithm for Shack-Hartmann Type Wavefront Sensors”, Journal of Optics (IOP), Vol. 16(5), 055403 (2014) [selected as Paper of the Week during 18-25, April 2014].

Biswajit Pathak and Bosanta R. Boruah, “Analysis of Error Propagation in an Improved Zonal Phase-Gradient Model”, Proceedings of SPIE: 9272 92721Y (2014).

Biswajit Pathak and Bosanta R. Boruah, “Zonal Wavefront Estimation Using an Array of Hexagonal Grating Patterns”, Proceedings of AIP: 1620, pp. 86-91 (2014).

Biswajit Pathak, Ankita Bhuyan and Debajyoti Barooah, “Gray-Level Co-occurrence Matrix Implementation Based on Edge Detection Information for Surface Texture Analysis”, Proceedings of ACEEE, pp. 348-352, DOI: 03.AETS.2014.5.360 (2014).

Biswajit Pathak and Debajyoti Barooah, “Texture Analysis Based on the Gray-Level Co-occurrence Matrix Considering Possible Orientations”, International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, Vol. 2(9), 4206-4212 (2013).

Biswajit Pathak, Abhijit Das and Bosanta R. Boruah, “High-Speed Zonal Wavefront Sensing”, Proceedings of SPIE: 8557 85570A (2012).

Conference Presentations

Biswajit Pathak, “Leveraging Programmable Diffracted Beams for Enhanced Wavefront Sensing and High-Resolution Imaging”, International Conference on Recent Advances in Photonics and Quantum Technologies, (OPTIQ - 2025) Kerala, India (2025) [Invited Talk].

Suyash Mehta, Emi Susan Shine, Goutham, A. S. and Biswajit Pathak, “Fourier Ptychography Microscopy with Multi-plane Adaptive Illumination”, SPIE Photonics Asia - 2025, Beijing, China (2025).

Suyash Mehta, Aryan Chand, Jasmine Paul, Chaitanya Malviya and Biswajit Pathak, “High-speed Confocal Imaging with Programmable Multi-beam Scanning”, SPIE Photonics Asia - 2025, Beijing, China (2025).

Suyash Mehta and Biswajit Pathak, “Fourier Ptychography Microscopy using SLM-Based Programmable Beam Illumination”, Conference on Optics, Atoms, and Laser Applications (KOALA - 2025), The University of Auckland, New Zealand (2025).

Jaspal Singh, Biswajit Pathak, C. S. Narayanamurthy and A. R. Ganesan, “Single-shot Multiple Wavefront Sensing in Kolmogorov Turbulence”, SPIE Optics + Photonics, California, USA (2025).

Anitta Jomy, Aryan Chand, C. S. Narayanamurthy, Dinesh N. Naik and Biswajit Pathak, “Improved Holographic Modal Wavefront Sensing”, Student Conference on Optics and Photonics and the Optical Society of India Symposium (SCOPOSIS), Physical Research Laboratory, Gujarat, India (2025).

Devesh Sharma and Biswajit Pathak, “Robust Sensor-less Adaptive Optics System with Reduced Crosstalk”, Student Conference on Optics and Photonics and the Optical Society of India Symposium (SCOPOSIS), Physical Research Laboratory, Gujarat, India (2025).

Jubin Jacob, Akshit Rajput and Biswajit Pathak, “Adaptive Quadriwave Lateral Shearing Interferometry Using Multiplexed Gratings for High-Sensitivity Wavefront Sensing”, Student Conference on Optics and Photonics and the Optical Society of India Symposium (SCOPOSIS), Physical Research Laboratory, Gujarat, India (2025).

Suyash Mehta and Biswajit Pathak, “Fourier Ptychography Microscopy Using SLM-Based Programmable Beam Illumination”, Optics and Photonics: Theory and Computational Techniques (OPTCT), Indian Institute of Technology Delhi, Delhi, India (2025).

Anitta Jomy, Suyash Mehta, Dinesh N. Naik and Biswajit Pathak, “Holographic Modal Wavefront Sensor with Optimized Quality Metric Parameter”, Optics and Photonics: Theory and Computational Techniques (OPTCT), Indian Institute of Technology Delhi, Delhi, India (2025).

Rupesh Kumar and Biswajit Pathak, “Optical Force Analysis in the Presence of Aberration in a Holographic Optical Trapping System”, Optics and Photonics: Theory and Computational Techniques (OPTCT), Indian Institute of Technology Delhi, Delhi, India (2025).

Aryan Chand, Mattaparthi Jeevan and Biswajit Pathak, “Generating High-Quality Scanning Beam for Laser Scanning Confocal Microscopy”, Optics and Photonics: Theory and Computational Techniques (OPTCT), Indian Institute of Technology Delhi, Delhi, India (2025).

Biswajit Pathak, “Multiplexed Grating Array Based Zonal Wavefront Sensor”, SPIE Photonics West - 2024, California, USA (2024).

Biswajit Pathak, et al., “Shack–Hartmann Wavefront Sensing Using Printed Liquid Crystal Microlens Arrays”, SPIE Photonics West - 2024, California, USA (2024).

Biswajit Pathak, et al., “Speckle Reduction in Interferometry Using Tuneable Liquid Crystal Diffusers”, SPIE Photonics West - 2024, California, USA (2024).

Deepak K. Jaduvanshi, C. S. Narayanamurthy and Biswajit Pathak, “Accurate Phase Reconstruction in Digital Holography Microscopy Using Fresnel Biprism”, SPIE Photonics West - 2024, California, USA (2024).

Anitta Jomy, Jubin Jacob, Suyash Mehta, and Biswajit Pathak, “Development of an Experimental Arrangement to Study the Impact of Atmospheric Turbulence on User-defined Beams”, International Conference on Advances in Optics and Photonics Instrumentation (OPTOIn), Chandigarh, India (2024).

Jaspal Sigh, Biswajit Pathak, C.S. Narayanamurthy, and A.R. Ganesan, “Multiplex-Wavefront Sensing using Grating Array based Wavefront Sensor”, International Conference on Advances in Optics and Photonics Instrumentation (OPTOIn), Chandigarh, India (2024).

Suyash Mehta, and Biswajit Pathak, “Fourier Ptychography Microscopy Using SLM-Based Programmable Beam Illumination”, International Conference on Advances in Optics and Photonics Instrumentation (OPTOIn), Chandigarh, India (2024).

Deepak Kumar, Biswajit Pathak, and C.S. Narayanamurthy “Diffraction Common-path Digital Holographic Microscopy with Controllable Beam Parameters”, International Conference on Advances in Optics and Photonics Instrumentation (OPTOIn), Chandigarh, India (2024).

Deepak K. Jaduvanshi, Biswajit Pathak, C.S. Narayanamurthy, “Enhancement of Fringe Density in Fresnel Biprism Based Digital Holography Microscopy”, International Conference on Optics, Photonics and Quantum Information (OPTIQ), CUSAT, Kerala, India (2023).

Jaspal Singh, Laxman Mandal, Biswajit Pathak, C.S. Narayanamurthy, AR Ganesan, “Study of Angular Anisoplanatism Using a Pseudo-Random Phase Plate”, International Conference on Optics, Photonics and Quantum Information (OPTIQ), CUSAT, Kerala, India (2023).

Biswajit Pathak, “Accurate Aberration Compensation Using Programmable Multiplexed Grating Patterns”, Digital Holography and Three-Dimensional Imaging - Optica, Cambridge University, Cambridge, UK (2022).

Biswajit Pathak, et al., “Compressive Imaging Through a Multimode Fiber Using Focus Illumination”, Humboldt meets Leibniz - Emerging Topics in Optics and Photonics, Hannover, Germany (2022).

Biswajit Pathak, et al., “Computational Super-Resolution Imaging with Multimode Fiber Using Optimized Illuminations”, SPIE Photonics West - 2022, California, USA (2022).

Biswajit Pathak, “An Improved Programmable Grating Array Based Wavefront Sensor”, SPIE Optics and Photonics, San Diego (Remote), California, USA (2021).

Biswajit Pathak, “Simultaneous Direct and Indirect Wavefront Sensing Using Multiplexed Programmable Grating Patterns”, SPIE Optics and Photonics, San Diego (Remote), California, USA (2021).

Biswajit Pathak, “An Array of Uniformly Illuminated Spots in a Programmable Grating Array Based Wavefront Sensor”, Photon 2020 (Institute of Physics), Virtual Event, UK (2020).

Biswajit Pathak, “Simultaneous Gradient and Curvature Wavefront Sensing Using an Array of Multiplexed Holograms”, Photon 2020 (Institute of Physics), Virtual Event, UK (2020).

Biswajit Pathak et al., "Simultaneous Optimisation of Confocal and Non-confocal Images in an AOSLO with a Reconfigurable Aperture Pattern" Medical Image Understanding and Analysis (MIUA), University of Oxford, UK (2020).

Biswajit Pathak, et al., “Optimizing image quality in non-confocal AOSLO imaging using a dynamically reconfigurable aperture pattern” XII Workshop on Adaptive Optics for Industry and Medicine (TU Delft), Technical University of Delft, Delft, Netherlands (2019).

Biswajit Pathak, “Quantification of Topological Charges in an Optical Vortex Beam Using a Reconfigurable Grating Array Sensor” Face2Phase (TU Delft), Technical University of Delft, Delft, Netherlands (2019).

Biswajit Pathak et al., “Development of a Digitally Reconfigurable Pinhole and Dynamic PSF Estimation Using a Shack-Hartmann Wavefront Sensor to Optimise Image Quality in an AOSLO”, Oxford Biomedical Imaging Festival (Oxford Biomedical Imaging Network), Worcester College, University of Oxford, UK (2019).

Biswajit Pathak, Oxford Photonics Day, Department of Engineering Science (University of Oxford), Oxfordshire, UK (2019).

Biswajit Pathak and Bosanta R. Boruah, “Grating Array Based Zonal Wavefront Sensor with Enhanced Spatial Resolution”, Photon 2018 (Institute of Physics), Aston University, Birmingham, UK (2018).

Biswajit Pathak and Bosanta R. Boruah, “A Zonal Wavefront Sensor with Improved Centroid Detection Accuracy”, Photon 2018 (Institute of Physics), Aston University, Birmingham, UK (2018).

Biswajit Pathak and Bosanta R. Boruah, “Zonal Wavefront Sensing with Enhanced Spatial Resolution and Improved Centroid Detection Accuracy”, International Topical Meeting on Applied and Adaptive Optics, (INTOPMAA), IIST, Kerala, India (2017).

Biswajit Pathak and Bosanta R. Boruah, “Comparison of Centroid Detection Algorithms in Different Atmospheric Turbulence Conditions”, International Topical Meeting on Applied and Adaptive Optics, (INTOPMAA), IIST, Kerala, India (2017).

Biswajit Pathak and Bosanta R. Boruah, “Spatial Resolution Enhancement using Grating Array based Zonal Wavefront Sensor”, International Conference on Light and Light based Technologies, Tezpur University, India (2016).

Biswajit Pathak and Bosanta R. Boruah, “Zonal Wavefront Sensing with Improved Accuracy”, International Conference on Light and Light based Technologies, Tezpur University, India (2016).

Biswajit Pathak and Bosanta R. Boruah, “Investigation of Algorithm Discretization Error in a Zonal Wavefront Estimation Process”, SPIE Photonics West - 2016, California, USA (2016).

Biswajit Pathak and Bosanta R. Boruah, “Binary Hologram Based High Speed Zonal Wavefront Sensing with Reduced Estimation Time”, SPIE Photonics West - 2016, California, USA (2016).

Biswajit Pathak and Bosanta R. Boruah, “Development of a Low-Cost Zonal Wavefront Sensing Method”, South Asian Workshop on Optics & Photonics, "SAWOP-2015", Guwahati, India (2015).

Santanu Konwar, Biswajit Pathak and Bosanta R. Boruah, “Hologram Based Wavefront Sensor of Light Beams”, TE-QIP Symposium to Celebrate the 2015 International Year of Light, Guwahati, India (2015).

Biswajit Pathak and Bosanta R. Boruah, “Reduction in the Amount of Crosstalk with Reduced Number of Focal Spot Rows in a Grating Array Based Zonal Wavefront Sensor”, International Conference on Optics and Photonics, Calcutta, India (2015).

Biswajit Pathak and Bosanta R. Boruah, “Analysis of Error Propagation in an Improved Zonal Phase-Gradient Model”, Photonics Asia, Beijing, China (2014).

Biswajit Pathak and Bosanta R. Boruah, “Zonal Wavefront Estimation Using an Array of Hexagonal Grating Patterns”, OPTICS’14: International Conference on Light, Kerala, India (2014).

Biswajit Pathak and Bosanta R. Boruah, “Wavefront Sensing Using a Grating Array with High Frame Rate”, XXXVII National Symposium of Optical Society of India, Pondicherry, India (2013).

Biswajit Pathak and Bosanta R. Boruah, “An Improved Zonal Wavefront Reconstructor Slope Geometry”, XXXVII National Symposium of Optical Society of India, Pondicherry, India (2013).

Biswajit Pathak, Abhijit Das and Bosanta R. Boruah, “High-Speed Zonal Wavefront Sensing”, Photonics Asia, Beijing, China (2012).

Biswajit Pathak and Bosanta R. Boruah, “An Improved Slope Model for Zonal Wavefront Reconstruction”, First IITG Optical Society of America Student Chapter Workshop on Optics, Guwahati, India (2012).

Biswajit Pathak, “Analysis of Bio-Speckle Pattern Based on the Gray-Level Co-occurrence Matrix Considering Possible Orientations”, First IITG Optical Society of America Student Chapter Workshop on Optics, Guwahati, India (2012).

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