Prof. Sourabh Roy

Courses:

Physics (UG) (Theory and Lab), Course No. PH101, PH102

Optical System Design (Theory &Lab) Couse Code: PH6201

Fourier Optics & Holography (Theory) Couse Code: PH 7202

Nonlinear optics (PG), (Theory), Course No. PH6261

Nanophotonics (PG), (Theory), Course No. PH6262

Optoelectronic Sensing and MOEMs, (PG), (Theory), Course No. PH7201

Biophotonics (PG), (Theory), Course No. PH7212

Integrated Optics (PG), (Theory), Course No. PH7264

Optics I (PG) (Lab), Course No. PH5105

Optics II (PG) (Lab), Course No. PH6205

ORCID Id: 0000-0002-8034-7367

Scopus Author ID: 56308762700

International Journals (SCI)

1. N Vangety, K Dey, Sourabh Roy “Transfer learning convolutional neural network for weight classification in a plastic optical fiber” Journal of Optical Communications, Vol:3, Mar, 2023.
2. Nikhil Vangety, Koustav Dey, Sourabh Roy, “Weight-location recognition in a plastic optical fiber using a convolutional neural network”, Optical Fiber Technology, 75, 103166, Feb 2023.
3. K Dey, V Nikhil, PR Chaudhuri, Sourabh Roy, “Demonstration of a fast-training feed-forward machine learning algorithm for studying key optical properties of FBG and predicting precisely the output spectrum”, Optical and Quantum Electronics 55 (1), 16, Jan 2023.
4. Koustav Dey, Sourabh Roy “Detailed investigation of spectral properties of SMS Fiber Segment and its sensing performance under varying multimode fiber lengths,” Infrared Physics and Technology 127, 104356, Jan 2023.
5. N Vangety, K Dey, SK Ghosh, Sourabh Roy, “Analyzing specklegrams of plastic optical fiber using convolutional neural network for weight recognition,” Optical Engineering 61 (12), 126112, Dec 2022
6. Koustav Dey, Sourabh Roy, “Analyzing spectral properties and sensing performance of multi-single-multi mode fiber combination,” Physica Scripta 97 (12), 125507, Sept 2022.
7. Uma C Mantena, Sourabh Roy, R Datla, “Evaluation of a digital micro-mirror device based near-infrared spectrometer for rapid and accurate prediction of quality attributes in poultry feed,” NFS Journal, 29, 51-59, Nov 2022.
8. Koustav Dey, Nikhil Vangety, Sourabh Roy, “Detailed investigation of spectral properties of SMS Fiber Segment and its sensing performance under varying multimode fiber lengths,” Infrared Physics and Technology (accepted, In print), 2022.
9. Vadapalli Durga Rama Pavan & Sourabh Roy “Exploring the Slow Light Features of Lattice Shifted Twist Induced Photonic Crystal Waveguides with Ring Like Holes” IETE Journal of Research, 1-7, Jan 2022.
10. Koustav Dey, Nikhil Vangety, Sourabh Roy, “Machine learning approach for simultaneous measurement of strain and temperature using FBG sensor,” Sensors and Actuators: A Physical, 333, Nov 2021.
11. Vadapalli Durga Rama Pavan and Sourabh Roy, “Analyzing dispersion properties of photonic crystal waveguides with hole and ring like lattice by introducing systematic shift and twist”, Optical and Quantum electronics, 53, 1-27, Nov 2021
12. C. Hari Krishna and Sourabh Roy “Generation and conditional switching of isolated C-points in optical beam output of few-mode fiber”, Optik, 247, 18012 1-6, Oct 2021.
13. Koustav Dey, V.D.R. Pavan, Ramesh Buddu, Sourabh Roy, “Axial force analysis using half-etched FBG sensor,” Optical Fiber Technology, 64, 102548, Jul 202.
14. Koustav Dey, B Ramesh and Sourabh Roy,” Performance of etched silica FBG for simultaneous strain temperature measurement,” Silicon, 13, Sept 2021.
15. Umachandi M, SRoy, Ramesh D. “Diffuse Reflectance Illumination Module Improvements in Near-Infrared Spectrometer for Heterogeneous Sample Analysis” IEEE Access 9, 153508-153517. 2021.
16. VDR Pavan, K Dey, S Roy “Optical Fiber-Based Intensity-Modulated Cost-Effective Small Lean Angle Measurement Sensor” MAPAN 36 (4), 925-930
17. K Dey, Sourabh Roy , P Kishore, MS Shankar, B Ramesh, R Ranjan, “Analysis and performance of edge filtering interrogation scheme for FBG sensor using SMS fiber and OTDR”, Results in Optics, 2, 100039, Jan 2021.
18. C. Hari Krishna and Sourabh Roy, “Polarization singular patterns in modal fields of few-mode optical fiber,” JOSA B, vol.57, No. 8, August 2020.
19. Vadapalli Durga Rama Pavan, Sourabh Roy, “Tuning of photonic bandgap in lithium niobate photonic crystal slab structures for wavelength filtering” Indian Journal of Pure & Applied Physics, 57, pp. 923-927, Dec 2019.
20. Onkar Nath Verma and Sourabh Roy, “High-Resolution All-Optical Imaging of Multimode Profiles in a Saturated Absorption Medium”, IEEE Journal of Quantum Electronics, vol.55, Issue2 pp 86200106(1-5), January 2019.
21. C. Hari Krishna and Sourabh Roy, “Poincare sphere representation for vector vortex modes of few-mode optical fiber,” Optical Engineering, Vol. 58 Issue 1, 016109, January 2019
22. C. Hari Krishna and Sourabh Roy, “Generation of inhomogeneously polarized vector vortex modes in a few mode optical fiber”, Optical & Quantum Electronics, vol 51, Issue 41, January 2019
23. Onkar Nath Verma and Sourabh Roy, “Microwave field controlled electromagnetically induced focusing”, Japanese Journal of Applied Physics, Vol 57, no.8S2, O8PF01, August 2018.
24. C. Hari Krishna & Sourabh Roy, "Analyzing characteristics of spiral vector beams generated by mixing of orthogonal LP11  modes in a few-mode optical fiber", Applied Optics, Vol. 57, Issue. 14, pp. 3853-3858, May 2018.
25. A Willinger, S Roy, M Santagiustina, S Combrié, A De Rossi, G Eisenstein “Narrowband optical parametric amplification measurements in Ga 0.5 In 0.5 P photonic crystal waveguides”, Optics Express, Vol 23, Issue 14, PP 17751-57, Jul, 2015
26. Sourabh Roy, M. Santagiustina, A.Willinger, G. Eisenstein, S.Combrie, A.De Rossi, "Parametric Gain and Conversion Efficiency in Nanophotonic Waveguides With Dispersive Propagation Coefficients and Loss," IEEE Journal of Lightwave Technology, Vol. 32, No. 6, pp. 1177-1182, March, 2014
27. A.Willinger, Sourabh Roy, M. Santagiustina, S. Combrie, A. De Rossi, I. Cestier, and G. Eisenstein, "Dual-pump parametric amplification in dispersion engineered photonic crystal waveguides," Optics Express, vol. 21, no. 9, pp. 10440-10453, May 2013.
28. A.Willinger, Sourabh Roy, M. Santagiustina, S. Combrie, A. De Rossi, I. Cestier, and G. Eisenstein, "Parametric gain in dispersion engineered photonic crystal waveguides," Optics Express, vol. 21, no. 4, pp. 4995-5004, Feb 2013.
29. Sourabh Roy, A.Willinger, S.Combrie, A.De Rossi, G. Eisenstein, M. Santagiustina, "Narrowband optical parametric gain in slow mode engineered GaInP photonic crystal waveguides," Optics Letter, vol. 37, no. 14, pp 2919-2921, June 2012.
30. Sourabh Roy, M. Santagiustina, A. De Rossi, S. Combrie, and P. Colman, "Modeling the dispersion of nonlinear coefficients in slow mode photonic crystals waveguides," IEEE Photonics Journal, vol. 4, no. 1, pp. 224-233, Feb. 2012.
31. Sourabh Roy and Partha Roy Chaudhuri, “Mode analysis of realistic optical waveguide structures and microstructured holey fibers by modal field evolution,” Optics Communication, vol.284, no.13, pp.3280-3287, June 2011.
32. Sourabh Roy, Kajal Mondal, and Partha Roy Chaudhuri, “Effects of tapering fabricated photonic crystal fibers in tailoring birefringence, dispersion and supercontinuum generation properties” Feature issue of Applied Optics on Guided Wave optics, vol.48, no.31, pp.G106-G113, Nov. 2009.
33. Sourabh Roy and Partha Roy Chaudhuri, “Supercontinuum generation in visible to mid-Infrared region in square-lattice photonic crystal fiber made from highly nonlinear glasses,” Optics Communication, vol.282, no.17, pp. 3448-34551, Sept. 2009.
34. Sourabh Roy and Partha Roy Chaudhuri, “Analysis of nonlinear multilayered waveguides and MQW structures: a field evolution approach using finite difference formulation”, IEEE Quantum Electronics, vol.45, no.4, pp 345-350, Apr. 2009.
35. Partha Roy Chaudhuri and Sourabh Roy, “Determining properties of fabricated index-guiding photonic crystal fibers using SEM micrograph and mode convergence algorithm”, Journal of Lightwave Technology, vol.26, issue.3, pp 379-386, Feb. 2008.
36. Partha Roy Chaudhuri and Sourabh Roy, “Analysis of arbitrary index profile planar optical waveguides and multilayer nonlinear structures: a simple finite difference algorithm”, Optical & Quantum Electronics, vol.39, no.3, pp 221-237, Feb. 2007.

Conference

1. K Dey, V Nikhil, A Majee, S Roy, “A machine learning approach for simultaneous measurement of temperature and strain using MSM,” JSAP-Optica Joint Symposia, Sept 2022
2. Koustav Dey, V. Nikhil, and S. Roy, “Simultaneous strain-temperature analysis by machine learning assisted FBG sensor,” CLEO (Applications and Technology), 2022.
3. Koustav Dey, V. Nikhil, S. Choudhary and S. Roy, “Analysis of the optical properties of a fiber Bragg grating using machine learning approach,” IEEE Photonics Conference (IPC), 1-2, 2021
4. Koustav Dey, S. Choudhary, D. Dinakar and S. Roy, “Multimode fiber length dependence on spectral properties and sensitivity of single-multi-single mode (SMS) fiber combination,” IEEE Photonics Conference (IPC), 1-2, 2021
5. Koustav Dey, V Nikhil and Sourabh Roy, “Machine learning approach to predict the output spectrum of different types of FBGs” JSAP-OSA Joint Symposia 2021, 1-2, 2021.
6. N. Vangety, Koustav Dey and S. Roy, “Quality Factor Assessment of a Laser speckle pattern for Stress sensing in a Statistical Modal Sensors” Asian Conference on Innovation in Technology (ASIANCON), 1-6, 2021.
7. Koustav Dey, VDR Pavan, Sourabh Roy, M Sai Shankar, and B Ramesh, “Interrogation of SMS for measuring of temperature and strain using half etched FBG with enhanced sensitivity”Micro-Structured and Specialty Optical Fibres VI, SPIE Photonics Europe, 1-6, 2020
8. Dr. Onkar Nath Verma and Sourabh Roy, “Subnanoscale Localization of Rare-Earth-Ion in Doped Crystal via Electromagnetically Induced Transparency”, 24th Microoptics Conference (MOC), 2019, Japan
9. Dr. Onkar Nath Verma and Sourabh Roy, “Electromagnetically-induced focusing controlled by a microwave field”, 22nd Micro optics Conference (MOC), Japan, 2017
10. Koustav Dey, Sourabh Roy, P Kishore, M Sai Shankar, and B Ramesh, “SMS and FBG interrogation for measurement of temperature and strain using OTDR”, OPIC 2019, JAPAN, Proc. Of SPIE, Vol. 1114201,                                                  doi:10.1117/12.2535570
11. Onkar N. Verma, Koustav Dey and Sourabh Roy “Diffraction-free mapping of arbitrary modes from pump to probe beam via coherent population oscillation in two-level system”, OPIC 2019, JAPAN. Proc. Of SPIE, Vol. 1114201, DOI: 10.1117/12.2535563
12. Koustav Dey, Sourabh Roy, P Kishore, M Sai Shankar, and B Ramesh, “FBG interrogation using SMS fiber and OTDR for simultaneous measurement of Temperature and Strain” , Photonics 2018, IIT Delhi. ISBN: 978-93-88653-41-1
13. Koustav Dey, Kanchan Ghosh, Sourabh Roy, P Kishore, M Sai Shankar, and B Ramesh, “Fabrication and analysis of Long-Period Gratings by Electric Arc Discharge”, FIO 2019, USA. ISBN: 978-1-943580-5
14. Koustav Dey, Kanchan Ghosh, Sourabh Roy, P Kishore, M Sai Shankar, and B Ramesh. “FBG Interrogation using SMS fiber and OTDR for simultaneous Measurements of Temperature and Strain”, Koustav Dey, Sourabh Roy, P Kishore, M Sai Shankar, and B Ramesh, JSAP-OSA Joint Symposia 2018, JAPAN. ISBN: 978-4-86348-694-2
15. Koustav Dey, Kanchan Ghosh, Sourabh Roy, P Kishore, M Sai Shankar, and B Ramesh, “Inscription and Optimization of Fiber-Optic Long Period Gratings Using Electric Arc Discharge”, 2019 24th Microoptics Conference (MOC), Toyama, Japan. IEEE Proceedings. DOI: 10.23919/MOC46630.2019.8982876. ISBN: 978-4-86348-712-3
16. Onkar N. Verma and Sourabh Roy, “Enhancement of Electromagnetically-induced Focusing by a Microwave Field” FIO 2017, 21-24 Sept., Washington, DC, USA.
17. Vadapalli Durga Rama Pavan and Sourabh Roy, “Optical Cloaking Using Afocal System” FIO 2017, 21-24 Sept., Washington, DC, USA.
18. C. Hari Krishna and Sourabh Roy, “Singularities in Higher Order Modes of Optical Fiber” Fotonica 2017, 2-5 May, Padova, Italy.
19. C. Hari Krishna and Sourabh Roy, “Optical Vortices in Higher Order LP Modes of Few Mode Optical Fiber” International Conference of Optics and Photonics 2016, IIT Kanpur.
20. P. V. N. Kishore, Nishath Ashfak Shaikh, Sourabh Roy, M. Sai Shankar, Putha Kishore, “Dual POF and prism sensor for liquid concentration measurement based on hysteresis area” SPIE Europe 2016, Belgium.
21. C. Hari Krishna and Sourabh Roy, “Generation and Switching of Phase Vortices in Cylindrical Vector Beams”, FIO 2016, USA.
22. Hari Krishna; Sourabh Roy “Comparative Photonic Bandgap Analysis on Square and Triangular Lattice Photonic Crystal Slabs” ICOP 2015, 20-22 Feb, 2015, Calcutta University.Marco Santagiustina, Sourabh Roy “Phase insensitive and sensitive optical parametric amplification in III-V semiconductor photonic crystal waveguides” Photonics 2014, 13-16 Dec, 2014, IIT Kharagpur
23. Hari Krishna; V D R Pavan;   Sourabh   Roy   “Photonic Band-gap   Analysis   on   Two Dimensional Photonic Crystal of Square and Triangular Lattice” Photonics 2014, 13-16 Dec, 2014, IIT Kharagpur
24. V D R Pavan; Hari Krishna; Sourabh Roy “Studying Semiconductor Photonic Crystal Slabs for Near IR Photonic Bandgap” Photonics 2014, 13-16 Dec, 2014, IIT Kharagpur.
25. P. V. N Kishore, M. Sai Shankar, P. Kishore, P. Vengal Rao and S. Roy, “Analyzing Characteristics of Sagnac Loop Interferometric Stress Sensor,”International Conference ICMP 2013, ISM Dhandab, 2013
26. Sourabh Roy, Marco Santagiustina , “ Narrowband optical parametric amplification in engineered photonic crystal waveguide: using CW and pulsed pump “ Fotonica 2013, 21-23 May, 2013, Milan, Italy.
27. Sourabh Roy, Marco Santagiustina, “Narrowband optical parametric amplification in Slow-light Engineered GaInP Photonic Crystal Waveguide”, Photonics 2012. 9-12 Dec, 2012, IIT Madras.
28. Sourabh Roy, M. Santagiustina, A. De Rossi, S. Combrié, A. Willinger, G. Eisenstein, “Slow Light Engineered Phoronic Crystal Waveguide: Propagation and Parametric Gain Properties,” XIX RiNEm 2012, 10-14 Sept., 2012, Rome, Italy.
29. Sourabh Roy, M. Santagiustina,G. Eisenstein, A. De Rossi, S. Combrié, “Gain Properties of Engineered Photonic Crystal Waveguide: The Effect of Dispersive Nonlinearity and Losses,” Fotonica 2012, Florence, Italy.
30. Sourabh Roy, M. Santagiustina, A. De Rossi, S. Combrié, and P. Colman, “Nonlinear coefficients in slow light engineered photonic crystal waveguides,” Topical meeting of Slow and Fast Light (SL), June 12-16 2011, Toronto, Canada.
31. Sourabh Roy, Sudip Kumar Chaterjee, Kajal Mondal, Partha Roy Chaudhuri, “Effect of liquid concentration modal propagation in large air-cladding microstructured fiber fabricated in-house”, Presented in International conference Photonics 2010, Dec. 11-15, 2010, IIT Guwahati, India.
32. Sourabh Roy, Kajal Mondal, Sudip K. Chaterjee, and Partha Roy Chaudhuri, “Design, In-house fabrication and analysis of suspended core silica-strand photonic crystal fiber,” Presented in the International conference ELECTRO 2009, Dec. 22-24, IT BHU, India
33. Sourabh Roy, Kajal Mondal, Sudip K. Chaterjee, and Partha Roy Chaudhuri, “Effect of tapering realistic photonic crystal fiber in tailoring birefringence and dispersion properties,” Presented in the International conference ICOP 2009, Oct. 30-Nov. 1, 2009, CISO, Chandigarh, India.
34. Sourabh Roy and Partha Roy Chaudhuri, “Supercontinuum generation at mid-infrared region in photonic crystal fiber made of chalcogenide glass”, Presented in National conference AOMD 2008, Dec. 22-24, 2008, IT BHU, India.
35. Sourabh Roy and Partha Roy Chaudhuri, “Analysis of Nonlinear multilayer structures using field evolution based on finite difference algorithm”, Presented in International conference Photonics 2008, Dec. 13-17, 2008, IIT Delhi, India.
36. Sourabh Roy and Partha Roy Chaudhuri, “Dispersion properties and infrared broadband generation in square lattice Photonic crystal fiber made from highly nonlinear glasses”, Presented in International conference Photonics 2008, Dec. 13-17, 2008, IIT Delhi, India.
37. Sourabh Roy and Partha Roy Chaudhuri, “Analysing characteristics of realistic photonic crystal fiber structures from SEM micrograph and a finite difference algorithm”, Presented in International conference Photonics 2006, Dec. 13-16, 2006, University of Hyderabad, India.

 Phd Students

• Dr. Ch.  Hari Krishna (Completed), Thesis Title: Vector Vortex Modes in Few Mode Optical Fibers: Generation and Characterization
• Mr. V. D. R. Pavan (Submitted), Thesis Title: “Studies on Mode Propagation and Related Phenomenon in Photonic Crystal Waveguides”
• Mr. Koustav Dey (Thesis Submitted)
• Mr. V. Nikhil (Ongoing)
• Mr. Anirban Majee (Ongoing)
• Ms. PM Pooja (Ongoing)
• Mrs. L Uma Chandi (Ongoing, Part Time)

• Three Days SPIE International Webinar on Applied Optics and Photonics, Nov 19-21. 2020. 
• One day Workshop on Advances in Applied Optics, AAO 2015, August 2014, NIT Warangal
• One day Workshop on Silicon Photonics,  November 2015, NIT Warangal
• One day Workshop on Advances in Photonics, November 2016, NIT Warangal
• One day Workshop on Fourier optics: Fundamental and it’s applications, September 2019, NIT Warangal

Sponsored Research Project 

1. BRNS (DAE) Sponsored Project on Fiber optic sensors worth 29 lakhs (2017-2020)
2.  SERB DST sponsored Project on Optical vortex Beam generation worth 39 lakhs (2020-2023)  
3.  Research Seed Money Project  by NIT W worth 3 Lakhs on Fiber optic sensors (Completed)

Deputy Chief Warden, NIT Warangal Hostel (May 2022 -Till date)

LMS Co-Ordinator and Site Admin for Scienence, HSS, SOM Departments

Faculty Adviser for the Physics Association, NIT Warangal (2015-2018)