GOVIND DAYAL SINGH
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ABOUT ME
I am currently working as an Assistant Professor in the Department of Physics & Astrophysics, Delhi University. Before joining Delhi University, I was an Assistant Professor at Banaras Hindu University and a JSPS Postdoc Fellow at the University of Tokyo.
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RESUME
Professional Experience
ASSISTANT PROFESSOR
July 2023 - Till date
At Delhi University (DU), I am involved in teaching and research. My research interests and activities are dedicated to studying light-matter interactions in artificially structured media and their applications in a broad range of areas such as thermal imaging, chemical sensing, renewable energy harvesting, and so on.
POSTDOCTORAL FELLOW
April 2018 - January 2021
Worked with Prof. Satoshi Ashihara at the Institute of Industrial Science, the University of Tokyo. The main focus of my project was on the experimental realization of vibrational strong coupling between molecular transitions and gap plasmons using molecule-embedded nanogap patch antenna.
RESEARCH FELLOW
December 2014Â - October 2017
Worked with Prof. Ranjan Singh at the Nanyang Technological University. The goal of my research at NTU was to investigate the plasmon hybridization of metallic and graphene nanostructures for exciting high-Q Fano resonances.
EDUCATION
PHD IN PHYSICS
Indian Institute of Technology Kanpur, India
Dissertation Topic: Metamaterials for multi-spectral infrared absorbers
July 2009 - June 2014
M.SC. IN PHYSICS
University of Allahabad, India
July 2006 - June 2008
B.SC. IN PHYSICS
University of Allahabad, India
July 2003 - June 2006
RESEARCH
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There has been a rapidly growing interest in the construction of new hybrid states based on strong coupling between light and matter excitations. Strong coupling occurs when the light is trapped in an optical resonator (microcavities or surface plasmon polaritons) filled with matter (electronic or vibrational exciton). Strongly coupled systems show great potential for novel photonic devices such as lasers, all-optical switching, field-effect transistors, and the evergreen field of quantum computation.
While molecules have been mostly studied under strong coupling to an electronic transition (ESC), vibrational strong coupling (VSC) also has much potential. Vibrational strong coupling affects the internal nuclear degrees of freedom, raising the possibility to manipulate and control molecular structure, material properties, and chemical reactions. The field is still in its infancy and the concepts of polaritonic chemistry i.e. the manipulation of the chemical structure through vibrational strong coupling are still not clear. We are investigating the new physics of strongly coupled systems using linear and non-linear infrared spectroscopy.
RESEARCH INTERESTS
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Thermal Photonics and Energy Applications
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Numerical simulation methods for nanophotonics
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Complex nanophotonic device design
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Plasmonic sensors
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Micro and Nanofabrication
RESEARCH ARTICLES
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Govind Dayal, Ikki Morichika and Satoshi Ashihara “Vibrational Strong Coupling in Sub-wavelength Nanogap Patch Antenna at the Single Resonator Level” The Journal of Physical Chemistry Letters, 12, 3171-3175 (2021).
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Y. K. Srivastava, A. Chaturvedi, M. Manjappa, A. Kumar, Govind Dayal, C. Kloc, R. Singh “MoS2 for ultrafast all-optical switching and modulation of THz metaphotonic devices” Adv. Opt. Mater. 5, 1700762 (2017).
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Govind Dayal, Ankur Solanki, Xin Yu Chin, Tze Chien Sum, Cesare Soci, Ranjan Singh “High-Q plasmonic infrared absorber for sensing of molecular resonances in hybrid lead halide perovskites” Journal of Applied Physics 122, 073101 (2017).
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Govind Dayal, Xin Yu Chin, Cesare Soci, Ranjan Singh “High-Q plasmonic Fano resonance enhanced multiband SEIRA of molecular vibrational sensing” Adv. Opt. Mater. 5, 1600559 (2017).
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Govind Dayal, Xin Yu Chin, Cesare Soci, Ranjan Singh “Independent Tailoring of Super-Radiant and Sub-Radiant Modes in High-Q Plasmonic Fano Resonant Metasurfaces” Adv. Opt. Mater. 4, 1860-1866 (2016).
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Manoj Gupta, Vassili Savinov, Ningning Xu, Longqing Cong, Govind Dayal, Shuang Wang, Weili Zhang, Nikolay I. Zheludev, Ranjan Singh “Sharp Toroidal Resonances in Planar Terahertz Metasurfaces” Adv. Mater. 28, 8206-8211 (2016).
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Govind Dayal, Xin Yu Chin, Cesare Soci, Ranjan Singh “High-Q Whispering-Gallery-Mode-Based Plasmonic Fano Resonances in Coupled Metallic Metasurfaces at Near Infrared Frequencies” Adv. Opt. Mater. 4, 1295-1301 (2016).
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S. N. Akhtar, S. Sharma, Govind Dayal, S. A. Ramakrishna, and J. Ramkumar “Micro-feature edge quality enhancement in excimer laser micromachining of metal films by coating with a sacrificial polymer layer” JMM (IOP, UK) 25, 065001 (2015).
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N. Rameshwari, Govind Dayal, S. A. Ramakrishna, B. Rajeswaran, and A. M. Umarji “Thermally switchable metamaterial absorber with VO2 ground plane” Opt. Comm. 364,154-157 (2015).
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Govind Dayal and S. A. Ramakrishna “Flexible Metamaterial Absorbers with multi-band infrared response” J. Phys. D: Appl. Phys. 48, 035015 (2015).
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Govind Dayal and S. A. Ramakrishna “Multipolar Localized Resonances for Multi-band Metamaterial Perfect Absorbers” J. of Opt. (IOP, UK) 16, 94016 (2014) (Invited article).
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Govind Dayal and S. A. Ramakrishna “Broadband infrared metamaterial absorber with visible transparency using ITO as ground plane” Opt. Express 22, 15104-15110 (2014).
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Govind Dayal, S. A. Ramakrishna, S. N. Akhtar and J. Ramkumar “Excimer laser micromachining using binary mask projection for large area patterning with single micron features” JMN (ASME) 1, 031002 (2013).
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Govind Dayal and S. A. Ramakrishna “Design of multi-band Metamaterial Perfect Absorbers with stacked metal-dielectric disks” J. of Opt. (IOP, UK) 15, 055106 (2013).
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Govind Dayal and S. A. Ramakrishna “Metamaterial Saturable Absorber Mirror” Opt. Letters 38, 272-274 (2013).
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Govind Dayal and S. A. Ramakrishna “Design of highly absorbing metamaterials for Infrared frequencies” Opt. Express 20, 17503-17508 (2012).
PATENTS
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Govind Dayal Singh, S. A. Ramakrishna and J. Ramkumar, “Dry Processing Method for the Fabrication of Binary Masks with Arbitrary Shapes for Ultra-Violet Laser Micromachining” US Patent 20150301444.
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Govind Dayal Singh, S. A. Ramakrishna and J. Ramkumar, “A green process for binary masks with isolated features for laser micromachining and photo-lithography” WO2014/108772A1.
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S. A. Ramakrishna and Govind Dayal Singh, “Saturable metamaterial absorber mirror for Q-switching applications in carbon dioxide lasers” US Patent 20140355639US20140355639A1.
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Govind Dayal Singh and S. A. Ramakrishna, “A dry process for rapid fabrication of large area shadow mask” US Patent 20150367452A1.