Dr. Sourabh Roy

Associate Professor

Department of Physics

National Institute of Technology, Warangal - 506004, Telangana, INDIA

: sroy@nitw.ac.in

: 8332969474

Interests: Integrated Optics; Fiber Optics; Nonlinear Optics; Photonic Crystal Waveguides and Fibers; Photonic Sensor; Optical Design

Research Outline

 My principal research interests are in the field of designing of optical waveguides, sensors and photonic devices. Currently, I am in a regular position of Associate Professor at NIT Warangal, India. I am involved here with active research with my PG and PhD students in field of fiber optic sensor and mode filed field studies of optical waveguides. So far under my supervision, one PhD student has successfully completed his PhD thesis and four students are ongoing. In my post-doctoral research, I have studied parametric amplification and four wave mixing experiments in special type optical fibers for slow light application. My study also includes achieving high-performance dispersion engineering on photonic crystal waveguides. In my doctoral research on analyzing waveguides and designing for device applications, I worked out new methods/algorithms aimed at precise and fast modeling /characterizing these complex structures, which I have implemented for experimentally fabricated structures as well as designs for new applications like supercontinuum generation, tapered device.

My immediate future plan of research is to carry out optical waveguide/fibers related theoretical and experimental studies for sensing applications and realizing new photonic devices/ structures.

 

Education

PhD (2005-10) , IIT Kharagpur

M.Sc in Physics (2002-04) , North Bengal University, Darjeeling, West Bengal


Working  Experience

 

March 2018 - Till Date

 

2012 -2018

 

Associate Professor, Department of Physics, NIT Warangal, India

 

Assistant Professor, Department of Physics, NIT Warangal, India

2010 - 2012 

 Post Doctoral Researcher

CNIT & University of Padova, Italy

Supervisor: Prof. Marco Santagiustina

Project :  EU-FP7 Governing the Speed of Light (GOSPEL)

2005 - 2010

 

 

CSIR & Institute Research Fellow

Department of Physics, Indian Institute of Technology, Kharagpur, India

 

 

 

Course Taught Previously

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

Publications

ORCID Id: 0000-0002-8034-7367

Scopus Author ID: 56308762700

 International SCI Journals:      

  1. Koustav Dey, Sourabh Roy, P. Kishor, M. Sai Shankar, B Ramesh, Rajeev Ranjan "Analysis and Performance of Edge Filtering Interrogation Scheme for FBG Sensor Using SMS Fiber and OTDR " Results in Optics (RIO Elsevier),  100039, Vol 2, Jan 2021.
  2. Hari Krishna and Sourabh Roy, “Polarization singular patterns in modal fields of few-mode optical fiber,” Journal of Optical Society of America B (JOSA B), vol.57, No. 8, August 2020.
  3. 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.
  4. 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
  5. 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
  6. 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
  7. Onkar Nath Verma and Sourabh Roy,“Microwave field controlled electromagnetically induced focusing”, Japanese Journal of Applied Physics, Vol 57, no.8S2, O8PF01, August 2018.
  8. Hari Krishna & Sourabh Roy, "Analyzing characteristics of spiral vector beams generated by mixing of orthogonal LP11modes in a few-mode optical fiber", Applied Optics, Vol. 57, Issue. 14, pp. 3853-3858, May 2018.
  9. 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
  10. 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, 32, No. 6, pp. 1177-1182, March, 2014
  11. 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.
  12. 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.
  13. 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.
  14. 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.
  15. Sourabh Roy and Partha Roy Chaudhuri, “Mode analysis of realistic optical waveguide structures and microstructured holey fibers by modal field evolution,” Optics Communication,284, no.13, pp.3280-3287, June 2011.
  16. 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.
  17. 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.
  18. 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, 45, no.4, pp 345-350, Apr. 2009.
  19. 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, 26, issue.3, pp 379-386, Feb. 2008.
  20. 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.

 

International Conference

 

    1. 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
    2. Dr. Onkar Nath Verma and Sourabh Roy, “Electromagnetically-induced focusing controlled by a microwave field”, 22nd Micro optics Conference (MOC), Japan, 2017
    3. Dr. Onkar Nath Verma and Sourabh Roy, “Enhancement of Electromagnetically-Induced Focusing by a Microwave Field”, FIO 2017, USA
    4. 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
    5. 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
    6. 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
    7. 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
    8. 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
    9. 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
    10. Vadapalli Durga Rama Pavan, C. Harikrishna, and Sourabh Roy, “Studying Semiconductor Photonic Crystal Slabs for Near IR Photonic Bandgap” International Conference on Fibre Optics and Photonics 2014 Kharagpur India, 13–16 December 2014, ISBN: 978-1-55752-882-7
    11. Vadapalli Durga Rama Pavan, and Sourabh Roy, “Optical Cloaking Using Afocal System” Frontiers in Optics 2017 Washington, D.C. United States, 18–21 September 2017, JTu2A. 31, ISBN: 978-1-943580-33-0.
    12. Vadapalli Durga Rama Pavan, and Sourabh Roy, M Sai Shankar “Electrically Tuned Bandgap Structures for Optical Switching Applications” JSAP-OSA Joint Symposia - 2018, 18p_221B_15, Nagoya Japan, 18–21 September 2018.
    13. Vadapalli Durga Rama Pavan, and Sourabh Roy, “Temperature Effects on Dispersion Tailoring of Slow Light Engineered Photonic Crystal Waveguide” 24th Microoptics Conference (MOC), 17-20 Nov. 2019, pp: 268-269, Toyama Japan.
    14. C. Hari Krishna and Sourabh Roy, “Controlled Generation of Isolated C-points in Few-mode Optical Fiber”, 24th Microoptics Conference (MOC), 17-20 Nov. 2019, Toyama Japan.
    15. C. Hari Krishna, VDR Pavan, Sourabh Roy, “Generation of vector vortex modes from tilted polarized LP11 modes in a few-mode fiber”, Proceedings of Photonics 2018, India.
    16. C. Hari Krishna, VDR Pavan, Sourabh Roy, “Spirally polarized OAM beam generation in few-mode fiber”, Optics+Photoncs 2018, SPIE Proceedings
    17. C. Hari Krishna and Sourabh Roy, “Singularities in Higher Order Modes of Optical Fiber” 3-5, May 2017, Italy.
    18. C. Hari Krishna and Sourabh Roy, “Generation and Switching of Phase Vortices in Cylindrical Vector Beams”, JW4A.98, Frontiers in Optics/Laser Science 2016, USA.
    19. C. Hari Krishna and Sourabh Roy, “Optical Vortices in Higher Order LP Modes of Few Mode Optical Fiber,” W2C.5, The International Conference on Fiber Optics and Photonics 2016.
    20. Sourabh Roy, A. Willinger, S. Combrie, A. De Rossi, G. Eisenstein, and M. Santagiustina, "Narrowband optical parametric amplification in engineered photonic crystal waveguide: using CW and pulsed pump," Fotonica 2013, 21-23 May, 2013, Milan, Italy.
    21. Sourabh Roy, M. Santagiustina, S. Combrie, A. De Rossi, A. Willinger, and G. Eisenstein, "Slow-light engineered photonic crystal waveguide: propagation and parametric gain properties," XIX RiNem, 10-14 September, 2012, Rome, Italy.
    22. Sourabh Roy, M. Santaguistina, G. Eisenstein, A. Willinger, S. Combrie, and A. de Rossi, "Narrowband Optical Parametric Amplification in Slow-light Engineered GaInP Photonic Crystal Waveguide," Photonics 2012, 9-12 December, 2012, IIT Mardas, India.
    23. Sourabh Roy, Marco Santagiustina, Gadi Eisenstein, Amnon Willinger, Sylvain Combrie, and Alfredo De Rossi, "Narrowband Optical Parametric Gain in Slow Light Photonic Crystal Waveguides," International conference Integrated Photonics Research, Silicon and Nanophotonics (IPRSN), June 17, 2012, Colorado Springs, Colorado, USA.
    24. Sourabh Roy, M. Santagiustina, A. De Rossi, S. Combrie, and P. Colman, 2Nonlinear coefficients in slow light engineered photonic crystal waveguides," Tropical meeting of Slow and Fast Light (SL), June 12-16 2011, Toronto, Canada.
    25. Sourabh Roy, Sudip Kumar Chaterjee, Kajal Mondal, Partha Roy Chaudhuri, "Effect of liquid concentration modal propagation in large air-cladding micro structured fiber fabricated in-house," International conference Photonics 2010, Dec. 11-15, 2010, IIT Guwahati, India.
    26. Kajal Mondal, Sourabh Roy and Partha Roy Chaudhuri, "Er+3-doped fiber amplifier in triangular PCF host revisited: higher gain, low splice loss," International conference Photonics 2010, Dec. 11-15, 2010, IIT Guwahati, India.
    27. Sudip Kumar Chatterjee, Sourabh Roy, P. Roy Chaudhuri, "Fused 3dB fiber coupler based Interferometer in strain and temperature measurement," International conference Photonics 2010, Dec. 11-15, 2010, IIT Guwahati, India.
    28. 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," International conference ELECTRO 2009, Dec. 22-24, IT BHU, India.
    29. Sourabh Roy, Kajal Mondal, Sudip K. Chaterjee, and Partha Roy Chaudhuri, "Effect of tapering realistic photonic crystal fiber in tailoring birefringence and dispersion properties," International conference ICOP 2009, Oct. 30-Nov. 1, 2009, CISO, Chandigarh, India.
    30. Sourabh Roy and Partha Roy Chaudhuri, "Analysis of Nonlinear multilayer structures using field evolution based on finite difference algorithm," International conference Photonics 2008, Dec. 13-17, 2008, IIT Delhi, India.
    31. Sourabh Roy and Partha Roy Chaudhuri, "Dispersion properties and infrared broadband generation in square lattice Photonic crystal fiber made from highly nonlinear glasses," International conference Photonics 2008, Dec. 13-17, 2008, IIT Delhi, India.
    32. Sourabh Roy and Partha Roy Chaudhuri, "Analysing characteristics of realistic photonic crystal fiber structures from SEM micrograph and a finite difference algorithm", International conference Photonics 2006, Hyderabad Central University.

 

 

National Conference

  1. 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.

PHDs Supervised

 Phd Students

  • Dr. Ch.  Hari Krishna (Completed)
  • Mr. V. D. R. Pavan (Ongoing)
  • Mr. Koustav Dey (Ongoing)
  • Mr. V. Nikhil (Ongoing)
  • Mrs. L Uma Chandi (Ongoing, Part Time)

Workshops/Conferences

 

  • Three Days SPIE International Webinar on Applied Optics and Photonics, Nov 19-21. 
  • 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

Projects

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)

Awards and Honors

 

Academic Accreditations & Fellowship

All India Exam Qualified

 

 

       Council of Scientific & Industrial Research (CSIR) National Eligibility Test (NET)          

          Dec.2005, Govt. of India

       Graduate Aptitude Test for Engineers (GATE) 2005 All India Rank:127

 

 

Fellowship

       Institute Research fellow of IIT Kharagpur from 2005 to 2006

        Junior & Senior Research fellow-CSIR, Govt. Of India from 2006 to 2010

        Research fellow- EU-FP7 project GOPSEL Jul-2010 to Aug-2011

 

 

Award

       Best paper in International conference ICOP 2009, Chandigarh, India.

 

Visiting Position

      Two months summer Visiting Researcher on  July 2015  in University of Padova , Italy

 

Additional Responsibility

 

 Hostel Warden  August 2014-August 2016 ,  NIT Warangal 

Faculty Adviser for the Painting Club, NIT Warangal

Faculty Adviser for the PG (II year) and PhD courses at NIT Warangal

Faculty Adviser for the SPIE Student Chapter NIT Warangal

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