Dibakar Roy Choudhury
Professor & HOD
dibakar.roychowdhury@mahindrauniversity.edu.in
Dr. Dibakar Roy Chowdhury is currently Professor of Physics in Mahindra University (erstwhile Mahindra École Centrale). Prof. Roy Chowdhury pursued his PhD from Technical University of Darmstadt, Germany (2008). Later he worked as a postdoctoral fellow in University of Duisburg-Essen, Germany (2008 – 2009) and Los Alamos National Laboratory (LANL), USA (2009 – 2013). Dr. Roy Chowdhury was working as scientist (level-B) with Australian National University (ANU), Canberra, Australia since 2013 which he left to join as an Associate Professor with Mahindra École Centrale, Hyderabad, India in January 2015. Currently he is heading nanotechnology program in Mahindra University along with Physics department. His research interests primarily deal with electromagnetics, materials, photonics and micro-nanotechnology, with special focus on studying light-matter interaction at the micro- nano- scale level. More precisely, his research interests are in the areas of metamaterials, plasmonic, semiconductor physics, nanophononics and micro- nano- fabrications. He has been working on design, simulations and fabrication of novel devices while simultaneously exploring their applications in information, sensing and energy related fields. So far, he has published around 64 papers in internationally reputed peer reviewed journals including Science, Applied Physics Letters, Scientific Reports, Optics Express, Physical Review B, Optics Letters etc. His current h index is 25 with total citations close to 4000. His works are highlighted by several scientific magazines such as Worldwide Science, Phys Org, Nanotechnology News, Nanotechnology Now, Laser Focus World, Terahertz Technology etc. His works were also highlighted in the cover page of Applied Physics Letters, Physica Status Solidi:RRL and Journal of Applied Physics. He is currently senior member of OSA and fellow of OSI & IETE.
2008
Ph.D :Technical University of Darmstadt, Darmstadt, Germany (2008)
2003
M.Tech (Physics):Indian Institute of Technology Madras, Chennai, India (2003)
2000
MSc (Physics):Rani Durgavati Vishwa Vidyalaya (RDVV), Jabalpur, India (2000)
2020
Head, Nanotechnology program, Mahindra University, India, 2020
2018
Professor & Head of Physics, Mahindra University (erstwhile Mahindra École Centrale), India, 2018
2015 - 2018
Associate Professor, Mahindra University, India, 2015 – 2018
2013-2015
Scientist – level B,Australian National University, Canberra, Australia 2013 – 2015
2009-2013
Postdoctoral research associate,Los Alamos National Laboratory, NM, USA 2009 – 2013
2008-2009
Postdoctoral research associate,University of Duisburg-Essen, Duisburg, Germany, 2008 – 2009
2003-2008
Graduate Research Assistant,Technical University of Darmstadt, Darmstadt, Germany, 2003 – 2008
Journal Publications
2022
- Effect of asymmetry on topological photonic crystals comprising of dielectric rod structures, Sambhu Jana, K Monika Devi, and Dibakar Roy Chowdhury, Optics Communications, 505, 127589 (2022)
- Demonstration of toroidal metasurfaces through near-field coupling of bright mode resonators, Soumyajyoti Mallick, Nitin Chourasia, Rakesh Singh, and Dibakar Roy Chowdhury, Applied Physics Express, 15, 012005 (2022)
- Magnetotransport modulation of Fano resonances in optically thin terahertz superlattice metasurfaces, Subhajit Karmakar, Ravendra Varshney, and Dibakar Roy Chowdhury, Accepted in Journal of Physics D: Applied Physics (2022)
2021
- Magnetic wires: transverse magnetism in one-dimensional plasmonic system, Subhajit Karmakar, Deepak Kumar, Bishnu P Pal, Ravendra Varshney, and Dibakar Roy Chowdhury, Optics Letters, 46, 1365 (2021)
- Dynamically tunable slow light characteristics in graphene-based Terahertz metasurfaces, Deepak Kumar, Monika Koijjam Devi, Ranjan Kumar, and Dibakar Roy Chowdhury, Optics Communications, 491, 126949 (2021)
- Elemental, Optical, and Time-Domain Terahertz Spectroscopy Studies on Methyl p-Hydroxybenzoate Single Crystal for THz Applications, Debabrata Nayak, N Vijayan, Manju Kumari, Pargam Vashishtha, Sudha Yadav, Mukesh Jewariya, Dibakar Roy Chowdhury, Govind Gupta, and R. P. Pant, Journal of Electronic Materials, 50, 6121 (2021)
- Topological Edge states in an all dielectric terahertz photonic crystals, Monika Koijam Devi, Sambhu Jana, and Dibakar Roy Chowdhury, Optical Materials Express, 11, 2445 (2021)
- Investigation of dynamical optical study of Bi2Te3 topological insulators thin film based on MWCNT flexible paper using terahertz spectroscopy. Subhash Nimanpore, Animesh Pandey, G Singh, B P Singh, Dibakar Roy Chowdhury, Y U Jeong, Rina Sharma, Sudhir Husale, and Mukesh Jewariya, Optical materials, 121, 111490 (2021)
- Ultrasensitive Terahertz sensing with broadside coupled polarization insensitive graphene metamaterial cavities, Sukhvinder Kaur, Subhajit Karmakar, K. Monika Devi, Ravendra K. Varshney, and Dibakar Roy Chowdhury, Optik, 248, 168073 (2021)
- Hybridization of Dark resonating states in terahertz metasurfaces, Sukhvinder Kaur, Subhajit Karmakar, Arun Jana, Ravendra K Varshney, and Dibakar Roy Chowdhury, Journal of Applied Physics, 130, 243101 (2021)
2020
- Resonance Phenomena in Electromagnetic Metamaterials for the Terahertz Metamaterials: A Review, Sabyasachi Banerjee, Bishnu Pal, and Dibakar Roy Chowdhury, Journal of ElectroMagnetic Waves and Applications, 1-24, (2020); doi.org/10.1080/09205071.2020.1713227
- Polarization Independent double band electromagnetically Induced Transparency effect in terahertz metamaterials, Rakesh Sarkar, K Monica Devi, Dipa Ghindani, Shriganesh Prabhu, Dibakar Roy Chowdhury, and Gagan Kumar, Journal of Optics, 22, 035105 (2020)
- Bandwidth Enhancement of Planar Terahertz Metasurfaces via overlapping of dipole modes, Deepak Kumar, Sabyasachi Banerjee, Ranjan Kumar, and Dibakar Roy Chowdhury, Plasmonics 15, 1925 (2020) DOI: 10.1007/s11468-020-01222-7
- Strong terahertz Matter Interaction induced Ultrasensitive Sensing in Fano Cavity based Metamaterials, Subhajit Karmakar, Deepak Kumar, Ravendra Varshney, and Dibakar Roy Chowdhury, Journal of Physics D: Applied Physics, 53, 415101 (2020); doi.org/10.1088/1361-6463/ab94e3
- Multifold coupling Enabled High Quality factor Toroidal resonances in Terahertz Metasurfaces, Deepak Kumar, Surya Pranav Ambatipudi, Sabyasachi Banerjee, Ranjan Kumar, and Dibakar Roy Chowdhury, Journal of Applied Physics, 127, 193103 (2020)
- Lattice Induced Plasmon Hybridization in Metamaterials, Subhajit Karmakar, Deepak Kumar, Ravendra Varshney, and Dibakar Roy Chowdhury, Optics Letters, 45, 3386 (2020)
- Growth and Characterization of Single Crystals of L-Histidine Hydrochloride Monohydrate for Nonlinear Optical Applications, S Yadav, M Kumar, D Nayak, S Banerjee, N Khan, S Nimanpure, G Moona, R Sharma, B K. Sharma, D. Roy Chowdhury, N. Vijayan, and M Jewariya, Journal of Electronic Materials, 49, 7502 (2020)
- Thin Film Sensing with Terahertz Metamaterials, Dibakar Roy Chowdhury, Parama Pal, and Bishnu Pal, Asian Journal of Physics, 29, 891-906 (2020)
- Modulating Extraordinary Terahertz Transmissions in Multilayer Plasmonic Metasurfaces, Sabyasachi Banerjee, Nakka Lok Abhishikth, Subhajit Karmakar, Deepak Kumar, Shreeya Rane, Sanket Goel, Abul K Azad, Dibakar Roy Chowdhury, Journal of Optics, 22, 125101 (2020)
2019
- Anomalous electric transport across Verwey transition in nanocrystalline Fe3O4 thin films, Murtaza Bohra, Dibakar Roy Chowdhury, Jean-Francois Bobo, and Vidyadhar Singh, Journal of Applied Physics, 125, 013901 (2019)
- Theoretical Investigation of Active Modulation and Enhancement of Fano Resonance in THz Metamaterials, Subhajit Karmakar, Ravi Varshney, and Dibakar Roy Chowdhury, OSA Continuum, 2, 531 (2019)
- Gradual Cross Polarization Conversion of Transmitted Waves in Near Field Coupled Planar Terahertz Metamaterials, S Jagan Mohan Rao, Rakesh Sarkar, Gagan Kumar, and Dibakar Roy Chowdhury, OSA Continuum, 2, 603 (2019)
- Deep Sub-wavelength Coupling Induced Fano Resonances in Symmetric Terahertz Metamaterials, Subhajit Karmakar, Sabyasachi Banerjee, Deepak Kumar, Girish Kamble, Ravendra Varshney, and Dibakar Roy Chowdhury, Physica Status Solidi: Rapid Research Letters, 13, 1970037 (2019) (Journal cover page)
- Ultra Thin Sub-wavelength Film Sensing through the excitation of Dark Modes in Terahertz Metasurfaces, Sabyasachi Banerjee, C. S. Amith, Deepak Kumar, Ganesh Damerla, Anil Kumar Choudhary, Sanket Goel, Bishnu Pal and Dibakar Roy Chowdhury, Optics Communications, 453, 124366 (2019)
- Fano Resonances in THz Metamaterials, Subhajit Karmakar, Ravi Varshney, Dibakar Roy Chowdhury, and Bishnu Pal, Asian Journal of Physics, 28, 663 (2019)
2018
- Plasmon Induced Transparency in graphene based terahertz metamaterials, Koijam Monika Devi, Maidul Islam, Dibakar Roy Chowdhury, Amarendra Kumar Sarma, and Gagan Kumar, European Physics Letters, 120, 27005 (2018)
- Dual-band electromagnetically induced transparency effect in a concentrically coupled asymmetric terahertz metamaterial, K Monika Devi, Dibakar Roy Chowdhury, Gagan Kumar, and Amarendra Sarma, Journal of Applied Physics, 124, 063106 (2018)
- Ultrfast Relaxation of Charge Carriers induced switching in Terahertz Metamaterials, S Jagan Mohan Rao, Gagan Kumar, Abul Azad, and Dibakar Roy Chowdhury, Journal of Infrared Millimetre and Terahertz Waves, 39 (12), 1211 (2018)
- Modulating Fundamental resonance in Capacitive Coupled Assymetric Terahertz Metamaterials, S Jagan Mohan Rao, Yogesh Shrivastava, Gagan Kumar, and Dibakar Roy Chowdhury, Scientific Reports, 8, 16773 (2018)
2017
- Terahertz Guided Mode Properties in an internally corrugated Plasmonic Waveguide, Maidul Islam, Dibakar Roy Chowdhury, Amir Ahmed, and Gagan Kumar, Journal of Applied Physics, 122, 053105 (2017)
- Modulating the near field coupling through resonator displacement in planar terahertz metamaterials, Jagan Mohan Rao, Deepak Kumar, Gagan Kumar, and Dibakar Roy Chowdhury, Journal of Infrared millimeter and Terahertz Waves, 38, 124 (2017)
- Plasmon Induced Transparency effects through alternatively coupled Resonators in Terahertz Metamaterials, Koijam Monika Devi, Amarendra Kumar Sarma, Dibakar Roy Chowdhury, and Gagan Kumar, Optics Express, 25, 10484 (2017)
- Probing the near field inductive coupling in broadside coupled terahertz metamaterials, Jagan Mohan Rao, Deepak Kumar, Gagan Kumar, and Dibakar Roy Chowdhury, IEEE Journal of Selected Topics in Quantum Electronics, 23(4), 1 (2017)
- Role of resonance modes on Terahertz Metamatrials based Thin Film Sensors, Maidul Islam, Jagan Mohan Rao, Gagan Kumar, Bishnu Pal, and Dibakar Roy Chowdhury, Scientific Reports, 7, 7355 (2017)
- Terahertz Plasmonic Waveguide based Thin Film Sensors, Maidul Islam, Dibakar Roy Chowdhury, Amir Ahmed, and Gagan Kumar, IEEE Journal of Lightwave Technology, 35, 5215 (2017)
2016
- Nonradiative and Radiative Resonance Energy Transfer in a Meta-molecule, L. Cong, N. Xu, D. Roy Chowdhury, M. Manjappa, C. Rockstuhl, W. Zhang, and R. Singh, Advanced Optical Materials, 4, 252 (2016)
- Displacement current mediated resonances in Terahertz Metamaterials, Chao Liu, Kriti Agarwal, Yuping Zhang, Dibakar Roy Chowdhury, Abul K. Azad, and Jeong-Hyun Cho, Advanced Optical Materials, 4, 1312 (2016) 10.1002/adom.201600196
2015
- Flexible Metasurfaces and Metamaterials: A Review of Materials and Fabrication processes at Micro- and Nano-Scales, Sumeet Walia, Charan Manish Shah, Philipp Gutruf, Hussein Nili, Dibakar Roy Chowdhury, Withawat Withayachumnankul, Madhu Bhaskaran and Sharath Sriram, Applied Physics Review, 2, 011303 (2015)
- Resonance tuning due to Coulomb interaction in strong near field coupled metamaterials,Dibakar Roy Chowdhury, Ningning Xu, Weili Zhang, and Ranjan Singh, Journal of Applied Physics, 118, 023104 (2015)
2014
- Charge Carrier Relaxation Processes in TbAs nanoinclusions in GaAs Measured By Optical-Pump THz-Probe Transient Absorption Spectroscopy, Laura Vanderhauf, Abul Azad, Cory C. Bomberger, Dibakar Roy Chowdhury, Antoinette J Taylor, Joshua Zide and Matthew Doty, Physical Review B, 89, 045418 (2014)
- Orthogonally twisted planar concentric split ring resonators towards strong near field coupled terahertz metamaterials, Dibakar Roy Chowdhury, John F. O’Hara, Antoinette J. Taylor, and Abul K. Azad, Applied Physics Letters, 104 (10), 101105 (2014)
- Ultrafast resonance switching in terahertz metamaterials using ion implanted silicon on sapphire,Dibakar Roy Chowdhury, Ranjan Singh, Antoinette J. Taylor, and Abul K. Azad, ArXiv: 1407.2715 (2014)
- Dark plasmonic mode excitation through symmetry breaking in terahertz metamaterials, Dibakar Roy Chowdhury, Xiaogang Fang, Yong Zeng, Xiaoshuang Chen, Antoinette J Taylor, and Abul K. Azad, Optics Express, 22, 19401 (2014)
- Probing the transition from an uncoupled to a strong near field coupled regime between bright and dark mode resonators in metasurfaces, Ranjan Singh, Ibraheem A. I. Al-Naib, Dibakar Roy Chowdhury, Longqing Cong, Carsten Rockstuhl, and Weili Zhang, Applied Physics Letters, 105 (8), 081108 (2014)
- Hybrid metasurface for ultra-broadband terahertz modulation, Janet Hayes, Withawat Withayachumnankul, Nathaniel Grady, Dibakar Roy Chowdhury, Abul K. Azad, and Hou-Tong Chen, Applied Physics Letters, 105 (18), 181108 (2014)
2013
- Terahertz Metamaterials for Linear Polarization Conversion and Anomalous Refraction, Nathaniel Grady, Janet Hayes, Dibakar Roy Chowdhury, Yong Zeng, Matthew T. Reiten, Abul K. Azad, Antoinette J. Taylor, Diego Dalvit and Hou-Tong Chen, Science, 340, 1304 (2013)
News Highlights in Terahertz Technology on May 20, 2013 - Influence of film thickness in THz active metamaterial devices: A comparison between super conductor and metallic split ring resonators, Ranjan Singh, Dibakar Roy Chowdhury, Abul K. Azad, Quanxi Jia, Antoinette J. Taylor, and Hou-Tong Chen, Applied Physics Letters, 103, 061117 (2013)
- Active and Passive coupling schemes in THz metamaterial based devices, Dibakar Roy Chowdhury, Abul K. Azad, Weili Zhang, and Ranjan Singh, IEEE Transactions on Terahertz Science and Technology, 3, 783 (2013)
- Ultrafast manipulation of near field coupling between dark and bright modes in terahertz metamaterials,Dibakar Roy Chowdhury, Ranjan Singh, Antoinette J. Taylor, Hou-Tong Chen and Abul K. Azad, Applied Physics Letters, 102, 011122 (2013)
2012
- Impact of resonator geometry and its coupling with ground plane on ultrathin metamaterial perfect absorber, Li Huang*, Dibakar Roy Chowdhury*, Suchitra Ramani, Matthew T. Reiten, Shengnian Luo, Abul K. Azad, Antoinette J. Taylor and Hou-Tong Chen, Applied Physics Letters, 101, 101102 (2012) (* equal contribution first authors);
arXiv:1207.0540v1 - Terahertz chiral metamaterials with giant and dynamically tunable optical activity, Jiangfeng Zhou, Dibakar Roy Chowdhury, Rongkau Zhao, Abul Azad, Hou-Tong Chen, Costas M. Soukoulis, Antoinette J. Taylor and John O’Hara, Physical Review B, 86, 035448 (2012)
- Coupling schemes in planar terahertz metamaterials, Dibakar Roy Chowdhury, Ranjan Singh, Antoinette J. Taylor, Hou-Tong Chen, Weili Zhang and Abul K. Azad, International Journal of Optics, 2012, 148985 (2012) (Review article)
- Experimental demonstration of terahertz metamaterial absorbers with a broad and flat high absorption band, Li Huang, Dibakar Roy Chowdhury, Suchitra Ramani, Matthew T. Reiten, Shengnian Luo, Antoinette J. Taylor and Hou-Tong Chen, Optics Letters, 37, 154 (2012),
arXiv:1109.3917v1
2011
- Dynamically reconfigurable THz metamaterial through photo-doped semiconductor, Dibakar Roy Chowdhury, Ranjan Singh, John F. O’Hara, Hou-Tong Chen, Antoinette J. Taylor and Abul K. Azad, Applied Physics Letters, 99, 231101 (2011) (Top 20 most downloaded article in December 2011)
News Highlights in Terahertz Technology on December 6, 2011 - Metamaterial induced transparency in a broken symmetry single Fano resonator array, Ranjan Singh, Ibraheem A. I. Al-Naib, Yuping Yang, Dibakar Roy Chowdhury, Wei Cao, Tsuneyuki Ozaki, Roberto Morandotti, and Weili Zhang, Applied Physics Letters, 99, 201107 (2011)
- A broadband terahertz metamaterial with nested structure,Dibakar Roy Chowdhury, Ranjan Singh, Matthew Reiten, Hou-Tong Chen, Antoinette J. Taylor, John F. O’Hara and Abul K. Azad, Optics Express, 19(17) 15817 (2011)
- Tailored resonator coupling for modifying the terahertz metamaterial response,Dibakar Roy Chowdhury, Ranjan Singh, Matthew Reitten, Jiangfeng Zhou, Antonoitte J. Taylor and John F. O’Hara, Optics Express, 19 (11), 10679 (2011)
- Resonance tuning in closely spaced inhomogeneous bilayer metamaterials, M. T. Reiten, D Roy Chowdhury, J. Zhou, A. J. Taylor, J. F. O’Hara and A. K. Azad, Applied Physics Letters, 98, 131105 (2011)
2010
- Field Effects on SnOx and SnO2 nanoparticles synthesized in the gas phase, Dibakar Roy Chowdhury, Ivaturi Aruna, Alexander Nedic, Frank E Kruis and Roland Schmechel, Physica E, 42 (9), 2471-2476 (2010)
2009
- Experimental demonstration of resonant-tunneling-diode operation beyond quasibound-state-lifetime limit, Michael Feiginov and Dibakar Roy Chowdhury, Journal of Physics: Conference Series193, 012016 (2009)
2007
- Operation of resonant tunneling diode beyond resonant-state lifetime limit, Michael Feiginov and Dibakar Roy Chowdhury, Applied Physics Letters, 91, 203501 (2007) (as journal cover page)
- The planar approach to a Al0.12Ga0.88N/GaN based double barrier HBV, Bogdan Nicolae, Dibakar Roy Chowdhury, Gabor Pop, H. L. Hartnagel, Daniel Pasquet, Frequenz, 61, 247-248 (2007)
- S parameter measurements of superlattice heterostructure barrier junctions towards THz varactors, Bogdan Nicolae, Dibakar Roy Chowdhury and Hans L. Hartnagel, Frequenz, 61, 245-246 (2007)
2006
- Simulation and Measurement of a New Type of Non-linear Component for Harmonic Extraction, Bogdan Nicolae, Dibakar Roy Chowdhury and Hans L. Hartnagel, Frequenz, 60, 206-209 (2006)
Peer reviewed publications in conference proceedings
2021
- Polarization sensitive Terahertz modulator based on electrically controlled Fano metasurfaces, Subhajit Karmakar, Ravendra K Varshney, Dibakar Roy Chowdhury, ICOL-2019: Proceedings of the International Conference on Optics and Electro-Optics, Dehradun, India, 895-898(2021)
2020
- Terahertz sensing with deep-subwavelength metasurface cavity operating near Fano excitation threshold, Subhajit Karmakar, Ravendra K Varshney, Dibakar Roy Chowdhury, Frontiers in optics, OSA, 2020
2018
- Single Split ring Resonator based terahertz metamaterials for refractive index sensing, S Jagan Mohan Rao, Maidul Islam, Gagan Kumar, Bishnu Pal, and Dibakar Roy Chowdhury, SPIE Photonics West, 10531, 105311K (2018)
- Electromagnetic response of dielectric nanostructures in liquid crystals, S Amaraganti, D Roy Chowdhury, M Ravnik, and J Dontabhaktuni, 10555, 105551F (2018)
- Controlling extra ordinary transmission through hole arrays using subwavelength periodic structures, N Lok Abhishikht, Sabyasachi Banerjee, Shashank Rangu, Sreekar Kamireddy, Abul K Azad, and Dibakar Roy Chowdhury, JTu2A.39 (2018)
2017
- Near Field Inductive Coupling in Terahertz Metamaterials, S Jagan Mohan Rao, Gagan Kumar and Dibakar Roy Chowdhury, JSAP-OSA Joint Symposium, Tokyo, Japan, 7p_A409_10 (2017)
2016
- Magnetic Metamaterials: A comparative study of resonator geometry and metal conductivity, Shashank Rangu, Kamireddy Sreekar, Raviniteish Reddy, Murtaza Bohra and Dibakar Roy Chowdhury, Conference on Computational Physics (CCP), IIT Guwahati (2015), Journal of Physics: Conference Series, 759, 012044 (2016)
- Terahertz Guided mode propagation in a planar plasmonic waveguide and slow light properties, Maidul Islam, Dibakar Roy Chowdhury and Gagan Kumar, OSA International Conference on Photonics and Fibre Optics, P1A.21 (2016)
2015
- Tuning of terahertz metamaterials’ resonances via near field coupling, Abul K. Azad, Dibakar Roy Chowdhury, Hou-Tong Chen, and Antoinette J. Taylor, Proceedings SPIE, 9483, (2015)
2014
- Ultra-Broadband Terahertz Modulation by Active Hybrid Metamaterials, Janet Hayes, Abul K. Azad, Dibakar Roy Chowdhury, Nathaniel Grady, and Hou-Tong Chen, IRMMW-2014, Tucson, Arizona, USA, R2 C-32.1 (2014)
2013
- Characterization of TbAs nanopartciles embedded in GaAs using pump-probe measurements of carrier relaxation dynamics, Laura Vanderhauf, Abul Azad, Dibakar Roy Chowdhury, Cory C. Bomberger, Joshua Zide and Matthew Doty, APS March Meeting, Baltimore, Marryland, B20003 (2013)
- Ultrafast Control of near field coupling in terahertz metamaterials, Dibakar Roy Chowdhury, Ranjan Singh, Hou-Tong Chen, Antoinette J. Taylor, and Abul K. Azad, CLEO, San Jose, USA, QTh1A.4 (2013)
- Broadband and high-efficiency terahertz metamaterial linear polarization converters, Nathaniel Grady, Janet Hayes, Dibakar Roy Chowdhury, Yong Zeng, Matthew T. Reiten, Abul K. Azad, Antoinette J. Taylor, Diego Dalvit and Hou-Tong Chen, IRMMW-2013, Mainz, Germany (2013)
- Enhanced electro-optic modulation in a single split-ring resonator, Dmitry Shchegolkov, Matthew Reiten, Dibakar Chowdhury, Antoinette Taylor, and Abul K. Azad, CLEO, San Jose, USA QTh1A.6 (2013)
2012
- Thermal and optical tuning in ultrathin superconducting Terahertz Metamaterials, Ranjan Singh, Jie Xiong, Dibakar Roy Chowdhury, Hao Yang, Abul K. Azad, Stuart A. Trugman, Quanxi Jia, Antoinette J. Taylor, and Hou-Tong Chen, Proc. SPIE, 8423, 84230Y (2012) (invited)
- Metamaterial absorbers and anti-reflection coatings: Experiments and theory, J. Zhou, J. F. O’Hara, L. Huang, D. Roy Chowdhury, M. T. Reiten, A. K. Azad, T. Koschny, C. M. Soukoulis, A. J. Taylor and H.-T. Chen, META 2012 (2012)
- Photo-doped silicon in split ring resonator gap towards dynamically reconfigurable terahertz metamaterials, Dibakar Roy Chowdhury, Ranjan Singh, John F. O’Hara, Hou-Tong Chen, Antoinette J. Taylor and Abul K. Azad, CLEO, San Jose, USA, QTu1G.4 (2012)
- Broadening of fundamental resonance via nested resonators in terahertz metamaterials, Dibakar Roy Chowdhury, Ranjan Singh, Matthew Reiten, Hou-Tong Chen, Antoinette J. Taylor, John F. O’Hara and Abul K. Azad, CLEO, San Jose, USA QTu3F.1 (2012)
- Electromagnetically induced transparency in an individual Fano resonator metamaterial, R. Singh, I. A. Al-Naib, Y. Yang, D. Roy Chowdhury, W. Cao, C. Rockstuhl, T Ozaki, R. Morandotti, and W. Zhang, CLEO, San Jose, USA QTu3F.5 (2012)
2011
- Active tuning of coupled resonance modes in terahertz metamaterials, Dibakar Roy Chowdhury, Abul K. Azad, Matthew Reiten, Antoinette J. Taylor and John F. O’Hara, CLEO, Baltimore, USA, CWK4 (2011)
- Passive resonance tuning through closely spaced coupled split ring resonators, Matthew T. Reiten, Dibakar Roy Chowdhury, Jiangfeng Zhou, John F. O’Hara, Antoinette J. Taylor and Abul Azad, CLEO, Baltimore, USA, QThA2 (2011)
- Active Terahertz Metamaterial devices, H.-T. Chen, A. K. Azad, J. F. O’Hara, R. Singh, J. Zhou, M. T. Reiten, D. Roy Chowdhury, Q. Jia, S. A. Trugman, and A. J. Taylor, IRMMW 2011, Houston, USA (2011)
2010
- Multilayer Terahertz Metamaterials: Interactions Between Layers Within the Deep-Subwavelength Limit, Matthew T. Reiten, Abul K. Azad, Dibakar Roy Chowdhury, Antoinette J. Taylor and John F. O’Hara, IRMMW-THz, Rome, Italy, (2010)
2008
- Resonant tunneling diodes beyond quasi-bound-state lifetime limit, Michael Feiginov and Dibakar Roy Chowdhury, Proc. SPIE, 6892, 68920D (2008) (invited)
- Experimental studies of double-barrier Al0.12Ga0.88N/GaN heterostructure varactors in view of frequency increases, Bogdan Nicolae, Dibakar Roy Chowdhury and Hans L. Hartnagel, German Microwave Conference (GeMic), Hamburg, Germany, 1-3 (2008)
2007
- Resonant tunneling diode: intrinsic response time vs. quasi-bound-state lifetime, Dibakar Roy Chowdhury and Michael Feiginov, WOCSDICE, Venice, Italy 195-198 (2007)
- Experimental and modeled configuration of double-barrier HBV based on Al0.7Ga0.3As/GaAs, B. Nicolae, D. Roy Chowdhury and H. L. Hartnagel, IWPSD, Mumbai, India, 351-354 (2007)
2005
- A novel way to reduce conduction current in Al0.7Ga0.3As/GaAs Heterostructure Barrier Varactors, Dibakar Roy Chowdhury, Mustafa Saqlam, Kabula Mutamba, Hans L. Hartnagel, IWPSD, Delhi, India, 817 – 821 (2005)
Conference Presentations
2019
- Thin Film Sensing with Assymetric Terahertz Metasurfaces, Sabyasachi Banerjee, Deepak Kumar, Sanket Goel, Bishnu P Pal, and Dibakar Roy Chowdhury, IEEE WRAP, IIT Guwahati (2019)
- Displacement Sensing using Terahertz Metasurfaces, Subhajit Karmakar, Ravendra K Varshney, and Dibakar Roy Chowdhury, IEEE WRAP, IIT Guwahati (2019)
2018
- Electromagnetic response of dielectric nanostructures, S Amarganti, D Roy Chowdhury, M Ratvik, and J Dontabhaktuni, Emerging Liquid Crystal Technologies, SPIE Photonics West, San Francisco, USA (2018)
- Tuning near field capacitive coupling in planar terahertz metamaterials, S Jagan Mohan, Maidul Islam, Gagan Kumar and Dibakar Roy Chowdhury, SPIE Photonics West, San Francisco, USA (2018)
- Controlling extra ordinary transmission through hole arrays using sub wavelength periodic structures, N Lok Abhishikht, S Banerjee, S Rangu, S Kamireddy, A K Azad, and Dibakar Roy Chowdhury, OSA Photonics Congress, Zurich, Switzerland (2018)
- Ultrafast Switching in Single Resonator based Metamaterials, S Jagan Mohan Rao, Gagan Kumar, and Dibakar Roy Chowdhury, OSI International Symposium in Optics, IIT Kanpur, Kanpur (2018)
- Localized Magnetic Field Enhancement in Fano Resonance based Active Metamaterials, Subhajit Karmakar, Ravi Varshney, and Dibakar Roy Chowdhury, OSI International Symposium in Optics, IIT Kanpur, Kanpur (2018)
2017
- Near Field Inductive Coupling in Terahertz Metamaterials, S Jagan Mohan Rao, Gagan Kumar, and Dibakar Roy Chowdhury, JSAP-OSA Joint symposia, Tokyo, Japan (2017)
2016
- Terahertz guided mode propagation in a planar plasmonic waveguide and slow slow light properties, Maidul Islam, Dibakar Roy Chowdhury, and Gagan Kumar, International Conference on Fibre Optics and Photonics, IIT Kanpur (2016)
2015
- Resonance Modulations in Metamaterials, Dibakar Roy Chowdhury, Indian Innovations in Materials Research, Calcutta, India (2015)
2014
- Dark Plasmonic Modes Excitation through Symmetry Breaking, Xiaofang Su, Dibakar Roy Chowdhury, Yong Zeng, Xiaoshuang Chen, and Abul Azad, META’14, Singapore (2014)
2013
- Characterization of TbAs nanoparticles embedded in GaAs using pump probe measurements of carrier relaxation dynamics, Laura Vanderhauf, Abul Azad, Dibakar Roy Chowdhury, Corey Bomberger, Joshua Zide, and Matthew Doty, APS March Meeting, Balitmore, Marryland, USA (2013)
- Metamaterials for broadband linear polarization conversion and near-perfect anomalous reflection and transmission, Nathaniel Grady, Jane Heyes, Dibakar Roy Chowdhury, Yong Zeng, Antoinette Taylor, Diego Dalvit, Hou-Tong Chen, 4th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META 2013), Sharjah, UAE (2013)
2012
- Metamaterial absorbers and anti-reflection coatings: Experiments and theory, J. Zhou, J. F. O’Hara, L. Huang, D. Roy Chowdhury, M. T. Reiten, A. K. Azad, T. Koschny, C. M. Soukoulis, A. J. Taylor and H.-T. Chen, META 2012, Paris, (2012)
- Silicon in split ring resonator gap: an efficient route to achieve reconfigurable metamaterials, Dibakar Roy Chowdhury, Ranjan Singh, John F. O’Hara, Hou-Tong Chen, Antoinette J. Taylor and Abul K. Azad, IWEM, Albuquerque, USA (2012)
- Photo-doped silicon in split ring resonator gap towards dynamically reconfigurable terahertz metamaterials, Dibakar Roy Chowdhury, Ranjan Singh, John F. O’Hara, Hou-Tong Chen, Antoinette J. Taylor and Abul K. Azad, CLEO, San Jose, USA (2012)
- Broadening of fundamental resonance via nested resonators in terahertz metamaterials, Dibakar Roy Chowdhury, Ranjan Singh, Matthew Reiten, Hou-Tong Chen, Antoinette J. Taylor, John F. O’Hara and Abul K. Azad, CLEO, San Jose, USA (2012)
- A novel approach to further decrease the thickness of ultrathin perfect metamaterial absorbers, L. Huang, D. Roy Chowdhury, S. Ramani, M. T. Reiten, S. Luo, A. K. Azad, A. J. Taylor, and H.-T. Chen, International Workshop on Metamaterials, Nanjing, China (2012)
- Metamaterial cavities: Theory, experiments, and applications, N. Grady, L. Huang, D. Roy Chowdhury, S. Ramani, M. T. Reiten, A. K. Azad, A. J. Taylor, and H.-T. Chen, MRS Fall Meeting, Boston, MA, USA (2012)
2011
- A simple approach for local variation in dielectric properties of PMMA by embedding monodisperse Gd2O3 nanoparticles from gas phase, I. Aruna, D Roy Chowdhury, R. Theissman, V. V. Shwartsman, F. E. Kruis and R. Schmechel, MRS, San Francisco, CA, USA (2011)
- Tunability of fundamental resonance in laterally coupled terahertz metamaterial, Dibakar Roy Chowdhury, Ranjan Singh, Matthew Reiten, Antoinette Taylor and John F. O’Hara, Optical Terahertz Science and Technology (OTST), Santa Barbara, CA, USA (2011)
- Resonance Tuning behavior in closely spaced inhomogeneous bilayer metamaterials, M. Reitten, D. Roy Chowdhury, J. Zhou, A. J. Taylor, J. F. O’Hara and A. Azad, Optical Terahertz Science and Technology (OTST), Santa Barbara, CA, USA (2011)
- Passive resonance tuning through closely spaced coupled split ring resonators, Matthew T. Reiten, Dibakar Roy Chowdhury, Jiangfeng Zhou, John F. O’Hara, Antoinette J. Taylor and Abul Azad, Conference on Lasers and Electro-Optics (CLEO), Baltimore, Maryland, USA (2011)
- Active tuning of coupled resonance modes in terahertz metamaterials, Dibakar Roy Chowdhury, Abul K. Azad, Matthew Reiten, Antoinette J. Taylor and John F. O’Hara, Conference on Lasers and Electro-Optics (CLEO), Baltimore, USA (2011)
- Tailored resonator coupling for modifying the Fundamental Resonance in Laterally coupled Terahertz Metamaterials, Dibakar Roy Chowdhury, Ranjan Singh, Matthew Reiten, Antoinette J. Taylor and John F. O’Hara, IRMMW-THz, Houston, Texas, USA (2011)
2010
- Non-linear THz metamaterials, John F. O’Hara, Jiangfeng Zhou, Dibakar Roy Chowdhury, Matthew Reiten and Antoinette Taylor, IWEM IV, Albuquerque, USA, (2010)
- Multilayer Terahertz Metamaterials: Interactions Between Layers Within the Deep-Subwavelength Limit, Matthew T. Reiten, Abul K. Azad, Dibakar Roy Chowdhury, Antoinette J. Taylor and John F. O’Hara, IRMMW-THz, Rome, Italy, (2010)
2009
- Response time and negative conductance of resonant-tunneling-diode beyond resonant state lifetime limit, Michael Feiginov and Dibakar Roy Chowdhury, 17th International Symposium in Nanostructures: Physics and Technology, Minsk, Belarus, (2009)
- Demonstration of field effect behavior by stoichiometric SnO2 nanoparticles synthesized from gas phase, Dibakar Roy Chowdhury, Ivaturi Aruna, Alexander Nedic, Claudia Busch, Frank E Kruis and Roland Schmechel, EMRS, Strassburg, France, (2009)
- Experimental demonstration of resonant-tunneling-diode operation beyond quasibound-state-lifetime limit, Michael Feiginov and Dibakar Roy Chowdhury, 16th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures (EDISON), Montpelliar, France, (2009)
- Stable aqueous dispersion of ZnO nanocrystals for printing Thin Film Transistors, A. Khaleel, D Roy Chowdhury, M. Ali, C. Busch, R. Schmechel, and M. Winterer, NSTI NanoTech, Texas, USA (2009)
- Ink-Jet printed ZnO nanoparticles films for different applications, A. Khaleel, D Roy Chowdhury, M. Ali, R. Schmechel, and M. Winterer, European Congress on Advanced Materials (EuroMat09), Glasgow, UK (2009)
2008
- Experimental studies of double-barrier Al0.12Ga0.88N/GaN heterostructure varactors in view of frequency increases, Bogdan Nicolae, Dibakar Roy Chowdhury and Hans L. Hartnagel, German Microwave Conference (GeMic), Hamburg, Germany (2008)
- Experimental demonstration of Resonant-Tunneling-Diode operation beyond resonant-state-lifetime limit, Michael Feiginov and Dibakar Roy Chowdhury, ICPS, Rio De Janeiro, Brazil (2008)
2007
- Experimental and modeled configuration of double-barrier HBV based on Al0.7Ga0.3As/GaAs, B. Nicolae, D. Roy Chowdhury and H. L. Hartnagel, International Workshop on the Physics of Semiconductor Devices (IWPSD), Mumbai, India (2007)
- Resonant tunneling diode: intrinsic response time vs. quasi-bound-state lifetime, Dibakar Roy Chowdhury and Michael Feiginov, Workshop on Compound Semiconductor devices and Integrated Circuits held in Europe (WOCSDICE), University of Padova, Venice, Italy (2007)
2005
- A novel way to reduce conduction current in Al0.7Ga0.3As/GaAs Heterostructure Barrier Varactors, Dibakar Roy Chowdhury, Mustafa Saqlam, Kabula Mutamba, Hans L. Hartnagel, International Workshop on the Physics of Semiconductor Devices (IWPSD), National Physical Laboratory (NPL), Delhi, India (2005)
- Terahertz Characterisation of undoped and doped ZnO nanowires, A Jana, KM devi, DR Chowdhury, SPAST Abstracts 1 (01)
- Controlling Extraordinary Terahertz Transmission Characteristics in Asymmetrical Sub-wavelength Coupled Hole Arrays, J YADAV, S Karmakar, RK Varshney, DR Chowdhury, SPAST Abstracts 1 (01)
- Transmission Studies on Vanadium Dioxide Based Active Metasurface, S Mallick, DR Chowdhury, SPAST Abstracts 1 (01)
- Topological transmissions in terahertz valley photonic crystals, KM Devi, S Jana, DR Chowdhury, SPAST Abstracts 1 (01
- Metamaterials, Plasmonics
- Light matter interaction
- Terahertz and Ultrafast phenomena
- Ultrafast and non-linear electronic devices
- Micro- and nano- structure fabrication
- Light trapping and Solar cells
Awards
- CSIR(Council for Scientific and Industrial Research) – NET (National Eligibility Test) examination for junior research fellowship and for eligibility of lecturership in India (2000)
- Graduate Aptitude Test in Engineering (GATE)[jointly organized by “Indian Institute of Technology” and “Indian Institute of Science”]: All India rank – 19 (2001)
- Institute Gold medal (2003):Class topper in the branch of solid state technology in M Tech from Indian Institute of Technology, Madras, India
- DAAD Fellowship (2002 – 2003):For pursuing the Master’s thesis from the selective technical universities of Germany
- Early Career Research Award (2016):Department of Science and Technology (DST), Government of India
- SERB Excellent awarded for project EMR/2015/001339