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INDIAN INSTITUTE OF TECHNOLOGY ROORKEE
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Rajesh Kumar
Associate Professor
rajesh.kumar[at]ph.iitr.ac.in
4869
Research Interests
Biosketch
Educational Details
Professional Background
Research
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Publications
Patents
Books
Collaborations
Honours and Awards
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Teaching Engagements
Teaching Engagements
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Research Interests
Semiconductor Photonics : Phase Change Photonic Materials and Devices, Qunatum Photonics : Silicon Quantum Photonic Devices, Reconfigurable Silicon Photonics, Devices and Subsystems, THz Photonics, Optoelectronics : Switches, Lasers, Photodetectors, Silicon and CMOS Photonics, Optical Signal Processing(Experimental), Optical Memories, Optical Waveguides, Resonators, Filters
BioSketch
Educational Details
Ghent University-IMEC (Belgium)
2012
Ph.D., Photonics Engineering
IIT Delhi
2008
M.Tech., Optoelectronics and Optical Communication
IIT Delhi
2006
M.Sc., Physics
Professional Background
Research Fellow
01 Jan 2012 - 01 Jan 2013
ORC, Southampton University, UK
Research Associate
01 Jan 2013 - 01 Jan 2015
University of Colorado Boulder, USA
Visiting Faculty
01 Jan 2015 - 01 Jan 2015
IIIT Allahabad
Research Engineer
01 Jan 2008 - 01 Jan 2012
IMEC(Belgium)
Assistant Professor
01 Dec 2015 - 11 Dec 2021
IIT Roorkee
Research
Projects
TOPIC START DATE FIELD DESCRIPTION FINANCIAL OUTLAY FUNDING AGENCY OTHER OFFICERS
Investigations on Mid-Infra-Red Phase Change Material Enabled Thermo-Optic Ultra-small Photonic Switches [IMPETUS] 16 Mar 2024 Hybrid Silicon Photonics ~35 Lacs SERB Anirban Mitra
Design and Experimental Exploration on Phase Change All-Photonic Memory(DEEPAM) 28 Mar 2017 Hybrid Silicon Photonics ~46 Lacs SERB-DST, India
Enabling Photonics Platform for Memories With a Phase Change Material 25 Jul 2016 Hybrid Silicon Photonics 10 Lacs FIG-SRIC-IITR
Infrastructural Grant for Chip-to-Chip Communication: RF and Optical on Same Platform 29 Aug 2017 Capacity building for electronic-photonic integrated testing ~ 2 Crore SMILE Grant IITR Vipul Rastogi, Monojit Bag, Nagendra P. Pathak, M. V. Kartikeyan and Sudip Roy
Energy-efficient Reconfigurable Si Photonic integrated Devices & Circuits for Optical Interconnect 12 Jan 2021 Reconfigurable Silicon Photonic Circuits ~39 Lacs DST, India - BRICS STI Framework
Research and Development of New Optical Fibers for Applications in Modern Laser Systems 15 Nov 2016 Optical Fibers ~ 35 Lacs DST (Joint Indo-Russian project) PI: Vipul Rastogi
Design & Development of Ultra-Wideband Multi-Octave Gallium Nitride MMIC based Power Amplifier 15 Jan 2019 MMIC Power amplifiers ~ 184 Lacs MHRD & DST (IMPRINT 2) PI: Karun Rawat
Nonlinear GaN HEMT Device Characterization for Power Amplifier Design and Implementation at X-Band frequencies. 01 Jul 2019 Power amplifier ~ 80 Lacs DRDO PI: Karun Rawat
FIST Level – II for setting up electron beam lithographic patterning facility 30 Mar 2021 Nano-fabrication ~ 6.5 Crores DST Team of Department of Physics, IITR.
THz Characterization System 04 Oct 2022 THz devices and systems ~ 6.5 Crores SMILE - IITR Team of ECE, Physics and CSE Department. Lead proposer: Nagendra P. Pathak
Self Powered Wavelength Selective NiO based Plasmonic UV-visible Photodetector 03 Mar 2023 Semiconductor Photonics ~ 25 Lacs SERB PI: Anirban Mitra




Publications

PUBLICATIONS SUMMARY

  • Total number of papers published : 80
  • International journal papers published: 25 (1 invited, 24 contributed, including one in Nature and one in Nature Photonics)
  • International conferences papers published:  55 (16 invited, 39 contributed)
  • Invited Talks and Lectures: 22
  • Total number of citations: 3000+

International Journals

  1. R.A. Yadav, C.B. Sirish, G. Morthier , and R. Kumar, "On-chip guided wave THz photonic switching with a phase change material on a dielectric waveguide encompassed with a novel micro-fins heater", vol.311, pp. 171889(1-12), Optik (2024)
  2. R. Prakash S, R.  Kumar, and A. Mitra, “Electrically reconfigurable phase change material based metamaterial absorber for broadband molecular fingerprint retrieval”, vol.11, pp. 1793-1803, ACS Photonics  (2024). 
  3. R. Prakash S, R.  Kumar, and A. Mitra, “Inverse design of dynamically tunable phase-change material based metamaterial absorber induced structural color”, Photonics and Nanostructure-Fundamentals and Applications, vol.54, pp.101135(1-9) (2023).
  4. C. Zhang, Y. Xiang, S. Liu, D. Liu, H. Yan, Y. Peng, H. Li, Y. Shi, L. Liu, R. Kumar, R. Panepucci, and D. Dai, “Silicon Photonic Wavelength-Selective Switch Based on an Array of Adiabatic Elliptical-Microrings”,  Journal of Lightwave Technology , , vol.41(17) , pp.5660-5667  (2023)
  5. M. F. Abdullah, N. Ali, V. R . Almeida R. Panepucci, Y. Xie, D. Dai, and R. Kumar, “Active volume engineered waveguide embedded nonvolatile photonic memory cell”, JOSA B, 39(5), pp. 1419-1428(2022)
  6. R. Prakash S, R. Kumar, and A. Mitra, "Reconfigurable and spectrally swicthable perfect absorber based on a phase change materail", Applied Optics, 61(10), pp. 2888-2897(2022)
  7. N.Ali, R. Panepucci, Y. Xie, D. Dai, and R. Kumar, “Electrically controlled 1X2 tunable switch using phase change material embedded silicon microring”, Applied Optics, 60(13), pp.3559-3568 (2021)
  8. C. Zhang, M. Zhang, Y. Xie, Y. Shi, R. Kumar, R. Panepucci and D. Dai, “Wavelength selective 2 X2 optical switch based on a GST assisted microring”, Photonics Research, 8(7), pp. 1171-1176 (2020).
  9. M.F. Abdullah, A.K. Mukherjee, R. Kumar and S. Preu , “Vivaldi end-fire antenna for THz photomixers”, Journal of Infrared,  Millimeter, and Terahertz Waves , 41,  pp. 728-739 (2020).
  10. N. Ali and R. Kumar , “Mid-infrared silicon photonic switches using Ge2Sb2Te5 embedded in SOI waveguide”, Nanotechnology, 31(11), pp.115207(9pp) (2020)
  11. N. Ali and R. Kumar , “Design of a novel nanoscale high performance phase-change silicon photonic switch”, Photonics and Nanostructure-Fundamentals and Applications, 32, pp.81-85  (2018).
  12. V. Srivastava,  M. Tolani, Sunny and R. Kumar “Design and Simulations of Ge2Sb2Te5 Vertical Photodetector for Silicon Photonic Platform”  IEEE Sensors Journal, 18(2), pp. 540-546 (2018).
  13. M. Tolani, Sunny, R.K. Singh, K. Shubham, and R. Kumar, “Two-Layer Optimized Railway Monitoring
    System using Wi-Fi and ZigBee Interfaced Wireless Sensor Network”, IEEE Sensors Journal, 17(7), pp.2241-48 (2017).
  14. C. Sun, M. Wade, M. Georgas, S. Lin, L. Alloatti, B. Moss, R. Kumar, A. Atabaki, F. Pavanello, J. M. Shainline, J. S. Orcutt,   R. Ram, M. Popovic and V. Stojanovic, “A 45nm CMOS-SOI Monolithic Photonics Platform with Bit-Statistics-Based Resonant Microring Thermal Tuning”, IEEE Journal of Solid State Circuits, vol.51(4), pp. 893-907(2016).
  15. C. Sun, M. T. Wade, Y. Lee, J. S. Orcutt, L. Alloatti, M. S. Georgas, A. S. Waterman, J. M. Shainline, R. R Avizienis, S. Lin, B. R.  Moss, R. Kumar, F. Pavanello, A. H. Atabaki, H. M.  Cook, A. J.  Ou, J. C. Leu, Y.-H. Chen, K. Asanovic, R. J. Ram, M. A.  Popovi?, and V. M.  Stojanovic, “Single-chip microprocessor that communicates directly using light”, Nature, 528(534), pp.534-538 (2015). 
  16. T. Van Vaerenbergh, M. Fiers, P. Mechet, T. Spuesens, R. Kumar, G. Morthier, B. Schrauwen, J. Dambre and P. Bienstman, “ Cascadable excitability in microrings”, Optics Express, 20(18), pp.20292-20308 (2012).
  17. J. Lloret, R. Kumar, S. Sales, F. Ramos, G. Morthier, P. Mechet, T. Spuesens, D. Van Thourhout, N. Olivier, J.-M. Fedeli and J.Capmany, “Ultra-compact electro-optic phase modulator based on III-V-on-silicon microdisk resonator”, Optics Letters, 37(12), pp.2379-2381 (2012).
  18. R. Kumar, T. Spuesens, P. Mechet, N. Olivier, J.- M. Fedeli, P. Regreny, G. Roelkens, D. Van Thourhout and G. Morthier, "10Gbit/s all-optical NRZ-OOK to RZ-OOK format conversion in an ultra-small III-V-on-silicon microdisk fabricated in a CMOS pilot line ", Optics Express, 19(24), pp. 24647-24656 (2011).
  19. R. Kumar, T. Spuesens, P. Mechet, P. Kumar, O.Raz, N. Olivier, J.- M. Fedeli, G. Roelkens, R. Baets, D. Van Thourhout and G. Morthier, "Ultra-fast and bias-free all-optical wavelength conversion using III-V-on-silicon technology", Optics Letters, 36(13), pp. 2450-2452 (2011).
  20. H. D. Jung, R. Kumar, P. Regreny, H. J. S. Dorren, T. Koonen and O. Raz, "Analog modulation characteristics of InP membrane microdisc laser for in-building networks", Electronics Letters, 47(2), pp. 121-123 (2011).
  21. D. Van Thourhout, T. Spuesens, S. Selvaraja, L. Liu, G. Roelkens, R. Kumar, G. Morthier, P. R. -Romeo, , F. Mandorlo, O. Raz, C. Kopp, and L. Grenouillet, "Nanophotonic devices for optical Interconnect", IEEE JSTQE (invited), 16(5), pp. 1363-1375 (2010).
  22. R. Kumar, L. Liu, G. Roelkens, E.-J.Geluk, T. de Vries, F. Karouta, P. Regreny, D. Van Thourhout, R. Baets and G. Morthier, "10GHz all-optical gate based on a III-V/SOI Microdisk ", IEEE Photonics Technology Letters, 22(13), pp. 981-983 (2010).
  23. L. Liu, R. Kumar, K. Huybrechts, T. Spuesens, G. Roelkens, E.-J. Geluk, T. de Vries, P. Regreny, D. Van Thourhout, R. Baets and G. Morthier, "An ultra-small, low-power, all-optical flip-flop memory on a silicon chip", Nature Photonics, 4(3), pp. 182-187 (2010).
  24. G. V. Prakash, K. Pradeesh, A. Kumar, R. Kumar, S. V. Rao, M. L. Markham and J. J. Baumberg, “Fabrication and optoelectronic characterisation of ZnO photonic structures”, Materials Letters, 62(8-9), pp. 1183-1186 (2008).
  25. J. Kaur, R. Kumar and M.C. Bhatnagar, “Effect of indium-doped SnO2 nanoparticles on NO2 gas sensing properties”, Sensors and Actuators B : Chemical, 126(2), pp. 474-484 (2007).

International and National Peer Reviwed Conferences

  1. R.A. Yadav,  M. Sumbria, and R. Kumar, “Micro-heater design to enable phase transition of GST for THz integrated phototonic”, Workshop on Optics and Photonics: Theory and Computational Techniques (OPTCT-2024), Indian Institute of Technology Roorkee, February 23-25, 2024.
  2. R. Prakash S, R. Kumar, and A. Mitra, “Electrically tunable color filter using a phase change material”, Workshop on Optics and Photonics: Theory and Computational Techniques (OPTCT-2024), Indian Institute of Technology Roorkee, February 23-25, 2024.
  3. R. Prakash S, R. Kumar, and A. Mitra, “Dynamically tunable structural color filter using a phase change material”, 84th JSAP Autumn Meeting, Kumamoto, Japan, 2023.
  4. M.F. Abdullah, R.A. Yadav and R. Kumar , “Effect of volume contraction of phase change material in a photonic binary memory cell”, XLV Symposium of the Optical Society of India Conference on Optics, Photonics & Quantum Optics         (COPaQ-2022) Indian Institute of Technology Roorkee, November 10-13, 2022.
  5. R. Prakash S, R. Kumar, and A. Mitra, “Tunable photodetector using a phase change material”, XLV Symposium of the Optical Society of India Conference on Optics, Photonics & Quantum Optics (COPaQ-2022) Indian Institute of Technology Roorkee, November 10-13, 2022.
  6. A. Maury, M.F. Abdullah and R. Kumar "Wavelength selective optical power attenuator using phase change material embedded silicon photonic microring ", International Workshop on Group IV Photonics, jointly organized online by NIT Delhi and National Chung Cheng University, Taiwan, p.6,  15-22 March 2022. 
  7. J. Ahuja, S. Singh, N. Ali and R. Kumar, “Sub-Nanojoule Electro-Optic Switching Using Ge2Sb2Te5 Integrated on Silicon Waveguide”, The International Photonics and Optoelectronics Meeting (POEM )Wuhan, China, paper no. 3263731, 2019.
  8. S. Singh and R. Kumar, “Silicon Photonic Waveguide Embedded Split Structure Ge2Sb2Te5 Cell for High Contrast Non-volatile Memory,” The International Photonics and Optoelectronics Meeting (POEM-2019), Wuhan, China, paper no. 3263731, 2019.
  9. N. Ali and R. Kumar, “Electro-thermal Phase Change Investigation for Integrated Silicon Photonic Switch and Memory”, International Conference on Optics & Electro-Optics (ICOL-2019), Dehradun, Uttarakhand, India, paper no. 240, 2019.
  10. N. Ali and R. Kumar, “Tunable optical filter enabled by phase change material embedded in SOI microring resonator,’’ The 80th JSAP-OSA Autumn Meeting 2019, paper no. C003739, 2019.
  11. R. Kumar, N. Ali and S. Singh, “High performance and CMOS-compatible photonic switches based on phase change materials (Invited)”, SPIE/COS Photonics Asia, paper  no. 11184-11, 2019.
  12. N. Ali and R. Kumar “Thermal Analysis of non-volatile optical switch for 1.55 µm applications”, International Conference on Photonics, Metamaterials & Plasmonics (PMP-2019), paper no. PT-56, pp.111(2019)
  13. R. Kumar, N. Ali, and S. Singh, “Nonvolatile Photonic Switching Devices On CMOS Compatible Platform” (Invited), IEEE International  Conference in Emerging Electronics, ICEE, Bangalore, 16-19 November 2018.
  14. N. Ali, and R. Kumar, “Chip-scale Mid Infra-red Photonic Switch Based on Ge2Sb2Te5 Incorporated in SOI Waveguide”, The International Conference on Fiber Optics and Photonics, Photonics- 2018, Manuscript ID 301, IIT Delhi New Delhi, India, 12-15 December, 2018.
  15. N. Ali, and R. Kumar, “Mid-IR Integrated Photonic Switch Using Non-volatile Phase Change Material Ge2Sb2Te5 Incorporated in Silicon-on-Insulator Waveguide”, International Conference on Optical Communications and Networks (ICOCN-2018), Manuscript ID ICOCN2018-2018-000081, Zhuhai, China.
  16. R. Kumar, S.Singh, N.Ali, and A. Sharma, “Hybrid Silicon Photonic Devices for Switching and Memory Applications”(Invited)", paper number 106,  OSI-ISO (Optical Society of India-International  Symposium  on Optics) (2018).
  17. N. Ali and R. Kumar, “Mid Infra-red Directional Coupler Optical Switch Based on Phase Change Material Embedded in Partially Etched SOI Waveguide”, Frontiers in Optics/Laser Science Conference (FIO/LS) , pp. paper JTu2A.102, (2018).
  18. M. Rehan, G. Kumar, V. Rastogi, and R. Kumar, “Femtosecond Pulse Propagation through Large Mode Area Tapered Fiber at 1.06 μm Wavelength”,  Frontiers in Optics/Laser Science Conference (FIO/LS), pp.paper  JW3A.81 (2018).
  19. S. Singh, N. Ali and R. Kumar, “Three Dimensional Optimization of Non-volatile Random Access Photonic Memory Cell”, (paper number 170619105943), proceedings of PIERS Singapore (2017).
  20. U.S. Tripathi, R. Kumar and V. Rastogi, “Fabrication of Long Period Waveguide Gratings in Ion Exchanged BK7 Rib Waveguide by Excimer Laser Ablation Method”,  (paper number 17061517140), proceedings of PIERS Singapore PIERS (2017).
  21. C. Sun, M.  Wade, Y. Lee, J.  Orcutt, L. Alloatti, M. Georgas, A. Waterman, J. Shainline, R.  Avizienis, S. Lin, B. Moss, R. Kumar, F. Pavanello, A. Atabaki, H. Cook, A. Ou, J. Leu, Y.-H. Chen, K. Asanovic, R.  Ram, M. A. Popovic, V. Stojanovic, "Microprocessor Chip with Photonics I/O"(Invited),”, The Optical Fiber Communication Conference (OFC) 2017, United States, pp. paper W1A.1, (2017)
  22. F. Pavanello, M.T. Wade, J. Notaros, J. M. Shainline, C. V. Poulton, C. Sun, M. Georgas, L. Alloatti, A.  Atabaki, R. Kumar, B. Moss, S. Lin, R. J. Ram, V. Stojanovic, and M. A. Popovic,  “Efficient nanoscale photonic devices and monolithic electronic-photonic subsystems in sub-100 nm SOI CMOS”,  (Invited) Photonics Conference(IPC) 2015.
  23. C. Sun, M. Wade, M. Georgas, S. Lin, L. Alloatti, B. Moss, R. Kumar, A. Atabaki, F. Pavanello, R. Ram, M. Popovi? and V. Stojanovi?, “A 45nm SOI Monolithic Photonics Chip-to-Chip Link with Bit-Statistics-Based Resonant Microring Thermal Tuning”, IEEE VLSI Symposia 2015.
  24. Milos A. Popovic, Mark T. Wade, Jason S. Orcutt, Jeffrey M. Shainline, C. Sun, Michael Georgas, Benjamin Moss, F. Pavanello, J. Notaros, L. Alloatti, R. Kumar, Yu-Hsin Chen, Amir H. Atabaki, J. Leu, Vladimir Stojanovic, and R. J. Ram “Photonics as a More-than-Moore Device Technology within Sub-100 nm SOI CMOS”, (Invited),”  (paper number 150306031339) in PIERS (Progress In Electromagnetics Research Symposium), 2015.
  25. M. T. Wade, F. Pavenello, J. S. Orcutt, R. Kumar, J. M. Shainline, V. Stojanovic, R. Ram  and M. A. Popovic, “ Scaling Zero-Change Photonics: An Active Photonics Platform in 32nm Microelectronics SOI CMOS Process”, Conference on Lasers and Electro-Optics (CLEO) 2015, United States, pp.paper SW4N.1, 2015
  26. M.T. Wade, F. Pavanello, R. Kumar, C.M. Gentry, A. Atabaki, R. Ram, V. Stojanovic and M.A. Popovic, “75% efficient wide bandwidth grating couplers in a 45 nm microelectronics CMOS process,” IEEE Optical Interconnects Conference (OI) 2015, pp. 46-47, 2015.
  27. M.A. Popovi?, M.T. Wade, J.S. Orcutt, J.M. Shainline, C. Sun, M. Georgas, B. Moss, R. Kumar, L. Alloatti, F. Pavanello, Y.H. Chen, K. Nammari, J. Notaros, A. Atabaki, J.C. Leu, V. Stojanovic, R.J. Ram, “Monolithic Silicon Photonics in a Sub-100nm SOI CMOS Microprocessor Foundry: Progress from Devices to Systems (Invited),” SPIE Photonics West: OPTO Silicon Photonics X, February 2015, paper 9367-66.
  28. M. T. Wade, R. Kumar, K. Nammari, C. M. Gentry, J. M. Shainline, J. S. Orcutt, A. Tamma, R. Ram, V. Stojanovic  and M. A. Popovic, “Unidirectional Chip-to-Fiber grating couplers in unmodified 45nm CMOS technology”, Conference on Lasers and Electro-Optics (CLEO) 2014, United States, pp. paper STh3M (2014).
  29. M. T. Wade, J. M. Shainline, J.  S. Orcutt, C. Sun, R. Kumar, B. Moss, M. Georgas, V. Stojanovic, R. J. Ram and M. A. Popovic, “Energy-efficient active photonics in zero change, state-of-the-art CMOS process ”, The Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference (OFCNFOEC) 2014, United States, pp. paper Tu2E.7, (2014).
  30. T. Van Vaerenbergh, M. Fiers, P. Mechet, T. Spuesens, R. Kumar, G. Morthier, K.T Vandoorne, B. Schneider, B. Schrauwen, J. Dambre and P. Bienstman, “Characterization of cascadable excitability in a silicon-on-insulator microring”, Annual Symposium of the IEEE Photonics Benelux Chapter, Belgium, pp.119-122 (2012).
  31. T. Van Vaerenbergh, M. Fiers, P. Mechet, T. Spuesens, R. Kumar, G. Morthier, K.T Vandoorne, B. Schneider, B. Schrauwen, J. Dambre and P. Bienstman, “ Self-pulsation and excitability mechanism in silicon-on-insulator microrings”,  Asia Communications and Photonics Conference (ACP) 2012, China, pp. paper ATh4B,  (2012).
  32. G. Roelkens, S. Keyvaninia, S. Stankovic, M. Tassaert, N. Hattasan, A. Gassenq, P. De Heyn, Y. De Koninck, P. Mechet, R. Kumar, M. Muneeb, D. Vermeulen, G. Morthier, R. Baets and D. Van Thourhout, “III-V-on-silicon membrane photonics for near-infrared and mid-infrared applications”,16th European Conference on Integrated Optics (ECIO 2012) (invited), Spain, (2012).
  33. R. Kumar, T. Spuesens, P. Mechet, N. Olivier, J.- M. Fedeli, P. Regreny, G. Roelkens, D. Van Thourhout and G. Morthier, "10Gbit/s Bias-free and Error-free All-optical NRZ-OOK to RZ-OOK Format Conversion Using a III- V-on-silicon Microdisk Resonator ", The Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference (OFCNFOEC) 2012, United States, pp. paper JW2A.77, (2012).
  34. R. Kumar, T. Spuesens, P. Mechet, J.– M. Fedeli, N. Olivier, P. Regreny, G. Roelkens, D. Van Thourhout, G. Morthier, "All-optical de-multiplexing of 10Gbps data using III-V/SOI microdisk resonators", Annual Symposium of the IEEE Photonics Benelux Chapter, Belgium, pp. 89-92 (2011).
  35. G. Morthier, P. Mechet, R. Kumar, G. Roelkens, T. Spuesens, T. De Vries, E. J. Geluk, P. Regreny, R. Baets, and D. Van Thourhout, "Progress in heterogeneously integrated silicon-InP laser diodes for on-chip all-optical networks and signal processing", Frontiers in Optics(FiO) 2011 (invited), United States, pp. paper FWBB4 (2011).
  36. G. Roelkens, S. Stankovic, S. Keyvaninia, P. Mechet, R. Kumar, T. Spuesens, G. Morthier, R. Baets, D. Van Thourhout, M. Lamponi, G. Duan, Y. Halioua, F. Raineri and R. Raj, "Laser sources on a heterogeneous III- V/silicon platform", IEEE Photonics Conference(IPC) 2011 (invited), United States, pp. 395-396 (2011).
  37. R. Kumar, T. Spuesens, P. Mechet, J.– M. Fedeli, N. Olivier, P. Regreny, G. Roelkens, D. Van Thourhout and G. Morthier, "Proof-of-concept Demonstration of an All-Optical De-multiplexer Using III-V/SOI Microdisk Resonator Fabricated in a CMOS Pilot Line", IEEE Photonics Conference (IPC) 2011, United States, pp. 127-128 (2011).
  38. R. Kumar, T. Spuesens, P. Mechet, P. Regreny, J.- M. Fedeli, N. Olivier, G. Roelkens, D. Van Thourhout and G. Morthier, "All-optical de-multiplexing using III-V/SOI microdisk resonators", European Semiconductor Laser Workshop (ESLW), Switzerland, (2011).
  39. R. Kumar, T. Spuesens, P. Mechet, P. Regreny, N. Olivier, J.-M. Fedeli, G. Roelkens, D. Van Thourhout and G. Morthier, "10Gbps bias-free all-optical wavelength conversion using InP-microdisk resonators heterogeneously integrated onto SOI ", European Conference on Optical Communications (ECOC) 2011, Switzerland, pp. paper We.9.LeSaleve.3 (2011).
  40. O. Raz, H.J.S.Dorren, R. Kumar, G. Morthier, P. Regreny and P. Rojo-Romeo, "50 fJ-per-bit, high Speed, directly modulated light sources for on-chip optical data communications", The Optical Fiber Communication Conference       Exposition and The National Fiber Optic Engineers Conference (OFCNFOEC) 2011, United States, pp. paper OMM5 (2011).
  41. P. Mechet, L. Liu, R. Kumar, K. Huybrechts, T. Spuesens, G. Roelkens, E.-J. Geluk , T. De Vries , P. Regreny , D. Van Thourhout, R. Baets and G. Morthier, "Heterogeneously integrated microdisk lasers for optical interconnects and optical logic", SPIE Photonics West 2011(invited), 7913, United States, pp. 791319 (2011).
  42. O. Raz, H. D. Jung, R. Kumar, P. Regreny, T. Koonen and H. J. S. Dorren, "Integrated InP membrane light sources for analog CMOS photonic transmitters", Annual Symposium of the IEEE Photonics Benelux Chapter, Netherlands, pp. 177-180 (2010).
  43. R. Kumar, P. Kumar, G. Roelkens, L. Liu, P. Regreny, T. de Vries, D. Van Thourhout, R. Baets and G. Morthier, "Performance analysis of III-V/SOI microdisk based all-optical gate for on-chip interconnects", Annual Symposium of the IEEE Photonics Benelux Chapter, Netherlands, pp. 129-131 (2010).
  44. K. Huybrechts, L. Liu, R. Kumar, T. Spuesens, G. Roelkens, E.J. Geluk, T. De Vries, P. Regreny, D. Van Thourhout, R. Baets and G. Morthier, "All-optical flip-Flops using electrically pumped microdisk lasers integrated on silicon ", IEEE Photonics Society Annual Meeting 2010 (invited), United States, p.paperMH1,  (2010).
  45. O. Raz, L. Liu, R. Kumar, G. Morthier, P. Regreny and H.J.S. Dorren, “A single InP membrane disc cavity for both transmission and detection of 10Gb/s signals in on-chip interconnects”, European Conference on Optical Communications (ECOC) 2010, Italy, pp. paper P2.12, (2010).
  46. G. Roelkens, D. Vermeulen, L. Liu, T. Spuesens, R. Kumar, P. Mechet, K. Huybrechts, S. Keyvaninia, S. Stankovic, M. Tassaert, P. De Heyn, K. Komorowska, S. Selvaraja, D. Van Thourhout, G. Morthier, R. Baets and R. Halir, "III-V/silicon photonic integrated circuits for FTTH and optical interconnect", The Fifith international Conference on Broadband and Biomedical Communications (IB2COM) 2010 (invited), Spain, (2010).
  47.  J. Hofrichter, O. Raz, F. Horst, N. Chrysos, C. Minkenberg, T. de Vries, H. J. S. Dorren, R. Kumar, L. Liu and B.-J. Offrein, "A fast and comprehensive microdisc laser model applied to all-optical wavelength conversion", Integrated Photonics Research, Silicon and Nano Photonics (IPR), Photonics in Switching (PS) 2010, United States, pp. PTuA2  (2010).
  48. G. Morthier, L. Liu, R. Kumar, P. Mechet, K. Huybrechts, G. Roelkens, T. Spuesens, T. de Vries, E.J. Geluk, P. Regreny, R. Baets and D. Van Thourhout, "Heterogeneous InP on SOI integration for the realization of all- optical logic devices", Integrated Photonics Research, Silicon and Nano Photonics (IPR), Photonics in Switching (PS) 2010 (invited), United States, pp. IWF2,  (2010).
  49. J. Hofrichter, F. Horst, N. Chrysos, C. Minkenberg, R. Kumar, L. Liu, G. Morthier, T. de Vries and B.J. Offrein, "Digital all-optical signal processing using microdisk lasers", Integrated Photonics Research, Silicon and Nano Photonics (IPR), Photonics in Switching (PS)2010, United States, pp. PTuA3 (2010).
  50. G. Morthier, R. Kumar, F. Raineri, R. Raj, J. Hofrichter, N. Chrysos, B.J. Offrein, R. Zhang, J. van der Tol, O. Raz and H.J.S Dorren, "Overview of the EU FP7-project HISTORIC", Proceedings of SPIE - Silicon Photonics and Photonic Integrated Circuits II 7719 (invited), Belgium, pp. 771908, (2010).
  51. K. Huybrechts, L. Liu, R. Kumar, T. Spuesens, G. Roelkens, E.-J. Geluk, T. de Vries, M. Smit, P. Regreny, P. Rojo-Romeo, D. Van Thourhout, R. Baets and G. Morthier, "Digital photonics using InP microdisk lasers heterogeneously integrated on Silicon-on-Insulator", European Conference on Integrated Optics (ECIO) 2010 (invited), United Kingdom, pp. WeF1, (2010).
  52. O. Raz, L. Liu, R. Kumar, G. Morthier, D. Van Thourhout, P. Regreny, P. Rojo-Romeo, T. de Vries and H.J.S. Dorren, "Compact, low power and low threshold electrically pumped micro disc lasers for 20Gb/s non return to zero all optical wavelength conversion", The Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference (OFCNFOEC) 2010, United States, pp. OMQ5, (2010).
  53. R. Kumar, K. Huybrechts, L. Liu, T. Spuesens, G. Roelkens, E.-J. Geluk, T. de Vries, P. Regreny, D. Van Thourhout, R. Baets and G. Morthier, "An ultra-small, low-power all-optical flip-flop memory on a silicon chip", The Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference (OFCNFOEC) 2010, United States, pp. OTuN7, (2010).
  54. R. Kumar, L. Liu, G. Roelkens, E.-J. Geluk , T. de Vries, P. Regreny, D. Van Thourhout, R. Baets and G. Morthier, "10GHz all-optical gate on a silicon chip", The Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference (OFCNFOEC) 2010, United States, pp. JWA44 (2010).
  55. R. Kumar, L. Liu, G. Roelkens, G. Morthier and R. Baets, "Simple and accurate measurements to characterize microdisk lasers for all-optical flip-flop operation", Annual Symposium of the IEEE Photonics Benelux Chapter, Belgium, pp. 81-84 (2009).

Honors And Awards
Honors
University of Colorado Boulder
2013
Research Associate Faculty Fellowship
ORC, University of Southampton
2012
Postdoctoral Fellowship
ICOCN, Zhuhai, China
2018
Best Paper Award
OPTICA (Formerly OSA)
2021
Senior Member
IEEE
2022
Senior Member
Optical Society of India (OSI)
2020
Life Fellow
Modern Physics Letters B
2023
Editorial Board Member
International Journal of Modern Physics B
2023
Editorial Board Member
MemberShips
OPTICA (formerly OSA)
07 Jul 2020 - Present
Senior Member
Optical Society of India
07 Jul 2020 - Present
Life Fellow
IEEE Photonics Society
07 Jul 2020 - Present
Member
IAPT
07 Jul 2020 - Present
Member
Teaching Engagements
Teaching Engagements
Analog and Digital electronics ( PHN-102 )
Spring
Engineering Analysis and Design ( PHN-205 )
Autumn
Electronics Lab ( PH-302 )
Spring
Optoelectronics ( PHN-712 )
Spring
Optical Communication Systems ( PHN-731 )
Spring
Semiconductor Photonics ( PHN-637 )
Autumn
Laboratory Work in Photonics ( PHN-711 )
Autumn
Optical Electronics ( PHN-713 )
Autumn
Guided Wave Optical Components & Devices ( PHN-702 )
Spring
Silicon Photonics ( PHN-737 )
Spring
Students
SuperVisions
Nonvolatile Silicon Photonic Switches Enabled by Waveguide Embedded Phase Change Material
15 Jul 2016 - 26 Apr 2021
Other Supervisors: , Scholar: Nadir Ali
RF-Photonic devices
01 Jan 2018 - Present
Other Supervisors: Geert Morthier, Scholar: Ram Ashish Yadav
GST-Si Based Photonic Devices
16 Aug 2020 - Present
Other Supervisors: , Scholar: Bhavna Thakur
Hybrid Silicon Photonic Devices
18 Jul 2022 - Present
Other Supervisors: , Scholar: Manvi Sumbaria
Silicon Photonic Devices (in CPQCT)
02 Jan 2023 - Present
Other Supervisors: , Scholar: Vidula B Palekar
Electrical Simulations of GST Based memory
07 Jul 2016 - 12 May 2017
Other Supervisors: , Scholar: Munendra Pal
GST coated SOI Optical Waveguides
27 Jul 2016 - 31 May 2017
Other Supervisors: , Scholar: Shubham Singh
Phase Change -SOI Strip Waveguide Photonic Switches
07 Jul 2020 - Present
Other Supervisors: , Scholar: Aditi Sharma
Interfacing Components for Photonic Integrated Circuirs
07 Jul 2020 - Present
Other Supervisors: , Scholar: Ms. Shivani Singh
Heterogeneously Integrated Microdisks for All-Optical Gating and Isolation
07 Jul 2020 - Present
Other Supervisors: Prof. Geert Morthier, Scholar: Pragati Kumar
Silicon Micro-ring Resonators for Neuromorphic Computing
07 Jul 2020 - Present
Other Supervisors: , Scholar: Sanket Shekhar
Design and Characterization of Vivaldi End-Fire Antenna for THz Photoconductive Sources
07 Jul 2020 - Present
Other Supervisors: Sascha Preu, Scholar: Faraz Abdullah,
Miscellaneous
Events
High Speed Optical Transmitters for Optical Interconnects
07 Jul 2020 - Present
GIAN(MHRD - Govt. of India)
All-optical flip-flops
01 Jan 2009 - Present
Microdisks : From laser to flip-flops.....and more
01 Jan 2009 - Present
III-V-on-silicon microdisks for on- and off-chip all-optical networks (invited), INTEL, Santa Clara, CA, USA, March 2012
01 Jan 2012 - Present
InP-on-silicon microdisks for on- and off-chip all-optical communication
01 Jan 2012 - Present
CMOS compatible and Native CMOS Photonic Devices for Optical Interconnects and Communication
01 Jan 2016 - Present
CMOS compatible and Native CMOS Photonic Devices for Optical Communication
01 Jan 2017 - Present
Toxic Gas Nano-photonic Gas Sensors on a CMOS Compatible Chip
01 Jan 2018 - Present
CMOS Photonics to detect pre/post explosion gases
01 Jan 2019 - Present
Activating the Silicon Photonic Platform with Hybrid Integration
01 Jan 2019 - Present
Integrated CMOS Compatible Hybrid Silicon Photonic Devices
01 Jan 2020 - Present
Visits
VUB Brussels
2009-01-01
Research Collaboration
Technical University of Eindhoven
2009-01-01
Project meeting
IBM Zurich Research Lab
2010-01-01
Project meeting
LPN (CNRS)-Paris( Marcoussis Campus)
2010-01-01
Project meeting
IBM Zurich Research Lab
2011-01-01
Project meeting
Technical University of Eindhoven
2011-01-01
Project meeting
IBM TJ Watson Research Center
2013-01-01
Research Talk
IISc Bangalore
2016-01-01
Research Collaboration
CSIO Chandigarh
2016-01-01
Potential Collaboration
SCL Chandigarh
2016-01-01
Potential Collaboration
R&D Center of Excellence, Sterlite Aurangabad
2017-01-01
Research Collaboration
IIT Kanpur
2019-01-01
Invited talk in conference
SCL Chandigarh
2019-01-01
Silicon Photonics Project Planning Meeting
TBRL Chandigarh
2019-01-01
Invited Talk
Zhejiang University
2019-01-01
Research Collaboration
CMTI Bengaluru
2023-09-22
Research Collaboratin
Administrative Positions
Officer-in-Charge: Electronics Lab
01 Jan 2016 - 01 Aug 2022
IIT Roorkee
Member: M.Tech. Programme Review Committe
01 Jan 2016 - 01 Jan 2016
IIT Roorkee
Member: B.Tech. Programme Review Committe
01 Jan 2016 - 01 Jan 2016
IIT Roorkee
Co-ordinator: Cognizance/Thomso
01 Jan 2016 - 01 Jan 2017
IIT Roorkee
Member: DRC
01 Jan 2016 - 01 Jan 2018
IIT Roorkee
Officer-in-Charge: Microprocessor Lab
01 Jan 2016 - 01 Jan 2018
IIT Roorkee
Convener-Department Faculty Search Committee
01 Jan 2017 - 15 Sep 2018
IIT Roorkee
Deputy O.C. M.Tech.(Photonics)
01 Jan 2018 - 31 Jul 2022
IIT Roorkee
Member- Department Safety Committee
01 Jan 2017 - Present
IIT Roorkee
DFC Secretary
01 Jan 2017 - 31 Jul 2022
IIT Roorkee
Memeber, DAPC
30 Jul 2019 - 30 Jul 2021
IIT Roorkee
Coordinator - M.Tech.(Photonics)
05 Jul 2021 - Present
IIT Roorkee
Anti-Ragging Committee
29 Dec 2021 - Present
IIT Roorkee
Faculty Advisor for Department Students
17 Jul 2023 - Present
IIT Roorkee
Professor I/C Examination of Physics Department
01 Aug 2022 - 01 Aug 2023
IIT roorkee
Member, Departmental Purchase Committe
03 Oct 2023 - 02 Oct 2024
IIT Roorkee
Member, Faculty Search Committee
08 Feb 2024 - 31 Dec 2025
CPQCT, IITR
Conferences/Workshops/Seminar/ Peer Review related activities
  • Technical Chair  of OSI  (Optical Society of India) symposium, 45th in series held at IIT Roorkee in November -2022.
  • Session organizer in PIERS (PhotonIcs & Electromagnetics Research Symposium / Progress In Electromagnetics Research Symposium), 43rd in series held in Hangzhou (China) in November -2021
  • Technical Programme Committee Member, OSI-FOP (Optical Society of India- Frontiers in Optics) symposium, 44th in series organized at IIT Delhi in September 2021.
  • Organizing member, OPTCT (Optics and Photonics : Theory and Computational Techniques) organized at IIT Roorkee in December 2020.
  • Organizing member, OPTCT (Optics and Photonics : Theory and Computational Techniques) organized at IIT Roorkee in March 2018.
  • Technical Programme Committee Member, PHOTONICS-2018, organized at IIT Delhi
  • Session Chair, IEEE INDICON-2017, organized at IIT Roorkee
  • Organizing committee member, TPSC seminar series at IITR; , during 2016-17.
  • Reviewer for OPTICA (formerly OSA), IEEE Photonics Society and SPIE Journals.