Dr. Somen Adhikary

@iitkgp.ac.in

Institute Postdoctoral Fellow, Department of E & ECE, IIT Kharagpur
IIT Kharagpur

Dr. Somen Adhikary


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https://researchid.co/somenphy
I am a physicist with a deep interest in nonlinear optics and integrated photonics. My research explores how light interacts with itself and with matter in confined geometries, leading to exciting phenomena such as wavelength conversion, Raman amplification, and supercontinuum generation.

I earned my Ph.D. in Physics from the Indian Institute of Engineering Science and Technology (IIEST), Shibpur, where my work focused on the temporal and spectral dynamics of optical pulses in silicon-based waveguides. My goal is to harness nonlinear effects for developing compact, tunable, and efficient photonic devices that can power next-generation optical communication and sensing systems.

Beyond research, I enjoy exploring emerging ideas in metasurface-based nonlinear optics and light–matter interaction at the nanoscale, bridging fundamental science with practical photonic technologies.

EDUCATION

1. B.Sc. Honours in Physics, B.B. College, Asansol, The university of Burdwan, 2011-2014
2. M.Sc. Physics (Optoelectronics), NIT Durgapur, 2014-2016
3. Ph.D. Physics (Fibre Optics and Waveguides), IIEST Shibpur, 2019-2025

RESEARCH, TEACHING, or OTHER INTERESTS

Atomic and Molecular Physics, and Optics, Computational Theory and Mathematics, Electronic, Optical and Magnetic Materials
16

Scopus Publications

42

Scholar Citations

4

Scholar h-index

3

Scholar i10-index

Scopus Publications

  • Wavelength conversion in the presence of Raman amplification in silicon rib waveguides
    Somen Adhikary, Atrayee Mishra, Binoy Krishna Ghosh, Dipankar Ghosh, Mousumi Basu
    Applied Optics, 2025
    This study presents the wavelength conversion facilitated by the interplay between a co-propagating triangular signal and a Gaussian pump by analyzing the nonlinear phase shift in highly nonlinear silicon-core rib waveguides, marking the first report of its kind, to our knowledge. The interaction between the pump and the signal enables possible amplification driven by cross-phase modulation and stimulated Raman scattering. To substantiate these findings, four waveguides are designed and optimized. Numerical solutions of the coupled amplitude equations result in a Raman gain of $∼18−22dB$ within a compact size, achieving performance comparable to or exceeding previously reported results. As predicted by the analytical model, spectral intensity doublets emerge, with their wavelength shifts and peak power ratios showing strong dependence on pump power and signal pulse width. Higher pump power causes larger wavelength shifts, while broader signal pulses expedite spectral splitting. The observed red-shift ranges from 65 to 81 nm, while the blue-shift spans 54 to 64 nm. Additionally, TPA and FCA play a crucial role in shaping the spectral doublet, particularly in highly nonlinear silicon waveguides. This work represents the first systematic exploration of wavelength conversion through pump-signal interaction in silicon rib waveguides, incorporating carrier lifetime effects and offering valuable insights into controlling spectral doublet generation for integrated photonic applications.
  • Highly coherent mid-infrared wideband supercontinuum generation by a silica cladded silicon nitride core buried waveguide
    Somen Adhikary, Dipankar Ghosh, Mousumi Basu
    Journal of Optics United Kingdom, 2024
    Optical waveguides with semiconductor cores are drawing considerable research interest in the domain of supercontinuum (SC) generation in recent times. In this work, we design a square-core silicon nitride buried waveguide with a silica-clad, aiming for a wideband spectrum generation in the mid-IR region when operated at the standard telecommunication wavelength of 1550 nm. Among different such silicon nitride square-core buried waveguides, we propose a typical design with dimensions of 400 nm × 400 nm along its height and width, capable of producing a highly coherent broadband intensity spectrum ranging from 810 nm to 5441 nm after propagating through just a few millimeters of the waveguide. The group velocity dispersion maintains minimal value over a broad wavelength range in the mid-IR region, while the nonlinear coefficient is estimated to be sufficiently high. The nonlinear pulse propagation through such a waveguide leads to achieving an SC spanning over 2.76 octaves, sufficiently broader than previously reported silicon nitride-based waveguides. Furthermore, our calculations confirm the highly coherent nature of the generated SC. To the best of our knowledge, this is the first report of SC generation maintaining a high degree of coherence over such a wide wavelength range in the mid-IR zone using a square-core silicon nitride buried waveguide.
  • Coherent Broadband Spectrum Generation in Rectangular Silicon Core Buried Waveguide Operated at Telecommunication Wavelength
    Somen Adhikary, Dipankar Ghosh, Mousumi Basu
    Silicon, 2024
  • Broadband spectrum generation in Silicon nanocrystal-based dual-slot waveguide
    Somen Adhikary, Ritesh Das, Mousumi Basu
    Proceedings of the IEEE International Conference on VLSI Design, 2024
    The generation of broadband spectrum in near-infrared regions has a very useful application in the domain of telecommunication. A silicon nanocrystal-based dual-slot waveguide was reported earlier to possess very low and flat group velocity dispersion and very high nonlinearity within an operating wavelength region of 1.2 to 1.6 pm which makes it a great candidate to achieve broadband spectrum generation within that wavelength range. In this work, we numerically study the generation of broadband frequency spectrum using in Silicon nanocrystal-based dual-slot waveguide. In this work, we have shown that using an un-chirped 90W super-Gaussian input pulse sharpness parameter 3 and with a temporal width of 500 fs results in a broadband intensity spectrum of wavelength span 1.284 to 1.836 pm covering the entire communication band starting from the O to L band, which makes it potentially applicable as a device in the field of communication and many more.
  • Effect of Co doping on structural and magnetic properties of kagome like La based cuprate francisite Cu3La(SeO3)2O2Cl
    P. Manna, S. Kanthal, Md. A. Ahmed, A. Banerjee, S. Adhikary, S. Kanungo, A. K. Yadav, S. N. Jha, D. Bhattacharyya, S. Bandyopadhyay
    Journal of Applied Physics, 2023
    The effects of Co doping on the structural and magnetic properties of a frustrated layered rare earth based synthetic analog of mineral francisite [Cu3La(SeO3)2O2Cl;(LaCufr)] have been investigated experimentally with a prior theoretical input. We have estimated intra-layer and inter-layer exchange interactions from density functional theory, which reveals the strong antiferromagnetic (AFM) nature of the studied compounds. 10 at. % Co-doped CuLafr confirms incorporation of Co2+ at the Cu2+ site with the local environment around dopant Co nearly similar around that of host Cu. An observed field-induced meta-magnetic transition and a spin reorientation transition have been interpreted considering magnetic exchange interactions. Co-doped LaCufr exhibits a decrease in the AFM ordering temperature and the critical field corresponding to a meta-magnetic spin-flip type transition. The competition and modulation among different intra-layer exchange interactions upon incorporation of Co into the Cu site may lead to such situations. The evidence of spin–phonon coupling from Raman analysis in both compounds is noteworthy and enriches their magnetic properties.
  • Generation of Broadband Supercontinuum by a So-designed Silicon on Insulator (SOI) Rectangular Buried Waveguide
    Tiyas Das, Somen Adhikary, Mousumi Basu
    2023 International Symposium on Devices Circuits and Systems Isdcs 2023 Conference Proceedings, 2023
    The generation of supercontinuum in near-infrared regions is a very useful application in the domain of telecommunication. Here we numerically study the generation of supercontinuum using an SOI rectangular core buried waveguide. From our simulation, we find that using an un-chirped 1.4 KW input Gaussian pulse with a temporal width of 200 fs results in a broadband intensity spectrum of wavelength span 1.275 to 1.912 µm covering the entire communication band starting from O to L, which makes it potentially applicable in the field of communication and many more.
  • Designing a Silicon-on-Insulator (SOI) Waveguide with an Aim of Studying Nonlinear Pulse Reshaping
    Hemant, Somen Adhikary, Mousumi Basu
    Lecture Notes in Electrical Engineering, 2023
  • Generation of Parabolic pulse by nonlinear pulse reshaping inside a Silicon on Insulator (SOI) Waveguide
    Hemant, Somen Adhikary, Mousumi Basu
    Journal of Physics Conference Series, 2022
    In recent times, silicon photonics attracts a lot of attraction of researchers. It is the technology that converts many functions of the circuit on the thumb-size chip. Nowadays, various types of technology platforms are being used to design photonic integrated circuits using various materials such as high index glass, semiconductors, polymers, and silicon. In our work, we have used silicon to design rectangular silicon on Insulator (SOI) buried waveguide. This type of waveguide has shown great potential in the field of pulse reshaping. We have used the effective index method for the calculation of group velocity dispersion and nonlinearity. Though the two-photon absorption and free-carrier generation contribute significantly to loss parameters, the highly nonlinear buried waveguide is found to be capable of reshaping super-Gaussian pulse input into a parabolic shape. Moreover, the values of input chirp, pulse width, and peak power are further optimized for the generation of a high-quality parabolic pulse at shorter lengths. The length required for pulse reshaping is much less when compared to optical fibers. Thus, our design waveguide has potential in the domain of pulse generation, signal processing, and many more.
  • Generation of high-frequency pulse train by designing a buried SOI waveguide
    Somen Adhikary, Hemant, Mousumi Basu
    Journal of Physics Conference Series, 2022
    Silicon photonics has attracted tremendous research interest in recent times because of its compact size, easy-to-build nature, and high values of nonlinearity. Though the study of pulse interaction inside a planer SOI waveguide is done earlier, the confinement of light should be better in the case of a buried core waveguide. Such a buried rectangular SOI waveguide is designed here, which possesses a small value of group velocity dispersion (β2) ∼2.432 (ps2/m) and a quite high value of nonlinear coefficient (γ) of ∼ 441.19 (W.m)−1. When the propagation of a pair of pulses of lower repetition rate (∼GHz) is investigated through it, we have found that the pulse pair interact with each other as they overlap and generate a high-frequency (∼THz) pulse train. The effect of timing jitter on high-frequency generation is also studied. The study of interactions of pulse pairs inside an SOI waveguide helps us to explore the potential applications of such devices as tunable high frequency (THz) pulse generators and many more.
  • Nonlinear pulse reshaping in a typically designed silicon-on-insulator waveguide and its application to generate a high repetition rate pulse train
    Somen Adhikary, Mousumi Basu
    Journal of Optics United Kingdom, 2021
    A silicon-on-insulator (SOI) planar waveguide is designed with a small group velocity dispersion ( β 2 ) ∼2.212 (ps 2 m −1 ) and a quite high nonlinear coefficient ( γ ) of ∼360.57 (W −1 m −1 ). The designed waveguide is capable of reshaping a super-Gaussian input optical pulse into a parabolic pulse (PP), without any use of external gain. The same waveguide with a relatively longer length can also generate a triangular pulse (TP) by using a positive chirp at the input. In both cases, PP and TP are created at a much shorter optimum length ( L opt ) of a few millimeters when compared to previously reported works on normal dispersion optical fibers. The interaction of a pulse pair inside such an SOI waveguide is investigated, for the first time as per our knowledge to generate a high-frequency (∼4.8 THz) pulse train, while lower repetition rate (∼180 GHz) pulses are used at the input. This study as a whole enables potential device applications in the domains of tunable high frequency (THz) pulse generators, optical signal processing, and many more.
  • Unique magnetic properties of Nd based cuprate francisite: Major enhancement upon Co doping
    S. Kanthal, P. Manna, Md.A. Ahmed, A. Banerjee, S. Adhikary, S. Kanungo, A.K. Yadav, S.N. Jha, D. Bhattacharyya, S. Bandyopadhyay
    Applied Surface Science, 2021
  • Establishment of the Validity of Time Transformation Approach to Study Pulse Compression in Silica-Based Single Mode Optical Fibers
    Roshmi Chatterjee, Binoy Krishna Ghosh, Debasruti Chowdhury, Somen Adhikary, Mousumi Basu
    Lecture Notes in Networks and Systems, 2021
  • Interaction of a Pair of Parabolic Self-similar Pulses in Nonlinearity Varying Chalcogenide Fibers (NVCFs)
    Somen Adhikary, Binoy Krishna Ghosh, Roshmi Chatterjee, Dipankar Ghosh, Navonil Bose, Mousumi Basu
    Lecture Notes in Networks and Systems, 2021
  • Parabolic Pulse Generation by Dispersion Increasing Chalcogenide Fiber (DICF) in Normal Dispersion Regime
    Binoy Krishna Ghosh, Somen Adhikary, Roshmi Chatterjee, Debasruti Chowdhury, Navonil Bose, Dipankar Ghosh, Mousumi Basu
    Lecture Notes in Networks and Systems, 2021
  • Triangular pulse generation by using chalcogenide fibers and creation of tunable High frequency oscillations from the Interaction of reshaped pulse pair
    Somen Adhikary, Binoy Krishna Ghosh, Mousumi Basu
    Optik, 2020
  • Generation of Triangular Pulse by a Highly Nonlinear Normally Dispersive Chalcogenide Fiber
    Somen Adhikary, Binoy Krishna Ghosh, Mousumi Basu
    Springer Proceedings in Physics, 2020

RECENT SCHOLAR PUBLICATIONS

  • Taper-assisted Ultra-Broadband Mid-IR Supercontinuum Generation in AsSe₂-MgF₂ Rib Waveguide
    P Naskar, S Adhikary, M Basu
    Available at SSRN 6756878 , 2026
    2026
  • Wavelength Conversion in a Silicon-Core Optical Fiber Using Symmetric and Asymmetric Triangular Pulses
    MB Atrayee Mishra, Somen Adhikary
    International Symposium on Advanced Materials and DeVices (SAMDeV) , 2025
    2025
  • Supercontinuum Generation through Dispersive Wave Emission in GeAsSe–MgF₂ Buried Rib Waveguides with two different Core Geometries
    MB Pappu Naskar, Somen Adhikary
    International Symposium on Advanced Materials and DeVices (SAMDeV) , 2025
    2025
  • Broadband Frequency Comb Generation Using a Rectangular Semi-Buried Arsenic Sulfide (As₂S₃) Core Waveguide
    MB Diptendra Sadhukhan, Kanakayush Upadhyay, Somen Adhikary
    Contemporary Studies in System Modelling and Simulation (COSSMOS), 37-47 , 2025
    2025
  • Wavelength Conversion in the Presence of Raman Amplification in Silicon Rib Waveguides
    AM Somen Adhikary, MB Binay Krishna Ghosh, Dipankar Ghosh
    Applied Optics 64 (26), 7713-7724 , 2025
    2025
    Citations: 1
  • Highly coherent mid-infrared wideband supercontinuum generation by a silica cladded silicon nitride core buried waveguide
    S Adhikary, D Ghosh, M Basu
    Journal of Optics 26 (10), 105501 , 2024
    2024
    Citations: 4
  • Coherent Broadband Spectrum Generation in Rectangular Silicon Core Buried Waveguide Operated at Telecommunication Wavelength
    S Adhikary, D Ghosh, M Basu
    Silicon 16 (11), 4673-4682 , 2024
    2024
    Citations: 1
  • Exploring the Impact of Temperature Variation on Supercontinuum Generation in a Rectangular Silicon Core Buried Waveguide
    MB Somen Adhikary
    Natural Sciences and Engineering for Sustainable Development (NSESD), 67-68 , 2024
    2024
  • Broadband spectrum generation in Silicon nanocrystal-based dual-slot waveguide
    S Adhikary, R Das, M Basu
    2024 37th International Conference on VLSI Design and 2024 23rd … , 2024
    2024
  • Generation of Broadband Supercontinuum by a So-designed Silicon on Insulator (SOI) Rectangular Buried Waveguide
    T Das, S Adhikary, M Basu
    2023 International Symposium on Devices, Circuits and Systems (ISDCS) 1, 1-5 , 2023
    2023
  • Effect of Co Doping on Structural and Magnetic Properties of Kagome Like La Based Cuprate Francisite Cu3la (Seo3) 2o2cl
    P Manna, S Kanthal, M Ahmed, A Banerjee, S Adhikary, S Kanungo, ...
    Journal of Applied Physics 133 (19), 193902 , 2023
    2023
    Citations: 4
  • Designing a Silicon-on-Insulator (SOI) Waveguide with an Aim of Studying Nonlinear Pulse Reshaping
    Hemant, S Adhikary, M Basu
    Emerging Electronic Devices, Circuits and Systems: Select Proceedings of … , 2023
    2023
    Citations: 1
  • Generation of high-frequency pulse train by designing a buried SOI waveguide
    S Adhikary, Hemant, M Basu
    Journal of Physics: Conference Series 2357 (1), 012008 , 2022
    2022
    Citations: 1
  • Generation of Parabolic pulse by nonlinear pulse reshaping inside a Silicon on Insulator (SOI) Waveguide
    Hemant, S Adhikary, M Basu
    Journal of Physics: Conference Series 2357 (1), 012010 , 2022
    2022
  • Efficient Triangular Pulse Generation in a Typically Designed Silicon on Insulator (SOI) Planar Waveguide
    MB Somen Adhikary, Pratim Biswas, Binoy Krishna Ghosh, Roshmi Chatterjee ...
    Prroceedings of the International Conference on Recent Trends in Photonics … , 2022
    2022
  • Nonlinear pulse reshaping in a typically designed silicon-on-insulator waveguide and its application to generate a high repetition rate pulse train
    S Adhikary, M Basu
    Journal of Optics 23 (12), 125506 , 2021
    2021
    Citations: 10
  • Unique magnetic properties of Nd based cuprate francisite: Major enhancement upon Co doping
    S Kanthal, P Manna, MA Ahmed, A Banerjee, S Adhikary, S Kanungo, ...
    Applied Surface Science 544, 148951 , 2021
    2021
    Citations: 10
  • Efficient Triangular Pulse Generation in Typically Designed Silicon on Insulator (SOI) Planar Waveguide
    S Adhikary, BK Ghosh, S Golui, P Biswas, R Chatterjee, M Basu
    Proceedings of International Conference on Recent Trends in Photonics (NPS … , 2021
    2021
  • Triangular pulse generation by using chalcogenide fibers and creation of tunable High frequency oscillations from the Interaction of reshaped pulse pair
    S Adhikary, BK Ghosh, M Basu
    Optik 204, 164208 , 2020
    2020
    Citations: 10
  • Generation of Triangular Pulse by a Highly Nonlinear Normally Dispersive Chalcogenide Fiber
    S Adhikary, BK Ghosh, M Basu
    Progress in Optomechatronics: Proceedings of the 20th International … , 2020
    2020

MOST CITED SCHOLAR PUBLICATIONS

  • Nonlinear pulse reshaping in a typically designed silicon-on-insulator waveguide and its application to generate a high repetition rate pulse train
    S Adhikary, M Basu
    Journal of Optics 23 (12), 125506 , 2021
    2021
    Citations: 10
  • Unique magnetic properties of Nd based cuprate francisite: Major enhancement upon Co doping
    S Kanthal, P Manna, MA Ahmed, A Banerjee, S Adhikary, S Kanungo, ...
    Applied Surface Science 544, 148951 , 2021
    2021
    Citations: 10
  • Triangular pulse generation by using chalcogenide fibers and creation of tunable High frequency oscillations from the Interaction of reshaped pulse pair
    S Adhikary, BK Ghosh, M Basu
    Optik 204, 164208 , 2020
    2020
    Citations: 10
  • Highly coherent mid-infrared wideband supercontinuum generation by a silica cladded silicon nitride core buried waveguide
    S Adhikary, D Ghosh, M Basu
    Journal of Optics 26 (10), 105501 , 2024
    2024
    Citations: 4
  • Effect of Co Doping on Structural and Magnetic Properties of Kagome Like La Based Cuprate Francisite Cu3la (Seo3) 2o2cl
    P Manna, S Kanthal, M Ahmed, A Banerjee, S Adhikary, S Kanungo, ...
    Journal of Applied Physics 133 (19), 193902 , 2023
    2023
    Citations: 4
  • Wavelength Conversion in the Presence of Raman Amplification in Silicon Rib Waveguides
    AM Somen Adhikary, MB Binay Krishna Ghosh, Dipankar Ghosh
    Applied Optics 64 (26), 7713-7724 , 2025
    2025
    Citations: 1
  • Coherent Broadband Spectrum Generation in Rectangular Silicon Core Buried Waveguide Operated at Telecommunication Wavelength
    S Adhikary, D Ghosh, M Basu
    Silicon 16 (11), 4673-4682 , 2024
    2024
    Citations: 1
  • Designing a Silicon-on-Insulator (SOI) Waveguide with an Aim of Studying Nonlinear Pulse Reshaping
    Hemant, S Adhikary, M Basu
    Emerging Electronic Devices, Circuits and Systems: Select Proceedings of … , 2023
    2023
    Citations: 1
  • Generation of high-frequency pulse train by designing a buried SOI waveguide
    S Adhikary, Hemant, M Basu
    Journal of Physics: Conference Series 2357 (1), 012008 , 2022
    2022
    Citations: 1
  • Taper-assisted Ultra-Broadband Mid-IR Supercontinuum Generation in AsSe₂-MgF₂ Rib Waveguide
    P Naskar, S Adhikary, M Basu
    Available at SSRN 6756878 , 2026
    2026
  • Wavelength Conversion in a Silicon-Core Optical Fiber Using Symmetric and Asymmetric Triangular Pulses
    MB Atrayee Mishra, Somen Adhikary
    International Symposium on Advanced Materials and DeVices (SAMDeV) , 2025
    2025
  • Supercontinuum Generation through Dispersive Wave Emission in GeAsSe–MgF₂ Buried Rib Waveguides with two different Core Geometries
    MB Pappu Naskar, Somen Adhikary
    International Symposium on Advanced Materials and DeVices (SAMDeV) , 2025
    2025
  • Broadband Frequency Comb Generation Using a Rectangular Semi-Buried Arsenic Sulfide (As₂S₃) Core Waveguide
    MB Diptendra Sadhukhan, Kanakayush Upadhyay, Somen Adhikary
    Contemporary Studies in System Modelling and Simulation (COSSMOS), 37-47 , 2025
    2025
  • Exploring the Impact of Temperature Variation on Supercontinuum Generation in a Rectangular Silicon Core Buried Waveguide
    MB Somen Adhikary
    Natural Sciences and Engineering for Sustainable Development (NSESD), 67-68 , 2024
    2024
  • Broadband spectrum generation in Silicon nanocrystal-based dual-slot waveguide
    S Adhikary, R Das, M Basu
    2024 37th International Conference on VLSI Design and 2024 23rd … , 2024
    2024
  • Generation of Broadband Supercontinuum by a So-designed Silicon on Insulator (SOI) Rectangular Buried Waveguide
    T Das, S Adhikary, M Basu
    2023 International Symposium on Devices, Circuits and Systems (ISDCS) 1, 1-5 , 2023
    2023
  • Generation of Parabolic pulse by nonlinear pulse reshaping inside a Silicon on Insulator (SOI) Waveguide
    Hemant, S Adhikary, M Basu
    Journal of Physics: Conference Series 2357 (1), 012010 , 2022
    2022
  • Efficient Triangular Pulse Generation in a Typically Designed Silicon on Insulator (SOI) Planar Waveguide
    MB Somen Adhikary, Pratim Biswas, Binoy Krishna Ghosh, Roshmi Chatterjee ...
    Prroceedings of the International Conference on Recent Trends in Photonics … , 2022
    2022
  • Efficient Triangular Pulse Generation in Typically Designed Silicon on Insulator (SOI) Planar Waveguide
    S Adhikary, BK Ghosh, S Golui, P Biswas, R Chatterjee, M Basu
    Proceedings of International Conference on Recent Trends in Photonics (NPS … , 2021
    2021
  • Generation of Triangular Pulse by a Highly Nonlinear Normally Dispersive Chalcogenide Fiber
    S Adhikary, BK Ghosh, M Basu
    Progress in Optomechatronics: Proceedings of the 20th International … , 2020
    2020