Department of Physics

Research Topics of Study and Grants

Chaos, Synchronization and Patterns

Studies on similarities and differences in the characteristics of stochastic and vibrational resonances are identified. Vibrational resonance is shown to occur only in the presence of hysteresis. Shape of the signal is found to alter the characteristics of stochastic resonance. Stability boundaries of periodic orbits and resonance dynamics are studied analytically in a two coupled Duffing - van der Pol oscillators. Analytical and numerical analysis on homoclinic bifurcations in asymmetrical Duffing oscillator are being carried out.

Analysis of spatiotemporal patterns and chaos synchronization in certain arrays of coupled dynamical systems is carried out. In particular, investigations on the nature of synchronizing transitions and size dependence in arrays of diffusively coupled dynamical systems are going on. Low dimensional behaviour and finite time predictability of coupled map lattices and arrays of diffusively coupled nonlinear oscillators are under detailed investigation. Studies on various properties in the context of chaos, different synchronization scenario in time delay systems have also been undertaken.

Computational Physics and Data Analysis

Algorithms and efficient computer codes based on split-step Crank-Nicholson and pseudospectral methods are developed for solving partial differential equations in one-, two- and three dimensions. In particular, investigations are being made on various aspects of Bose-Einstein condensates such as the effect of periodic modulation, formation of vortex lattices, bright and dark solitons and their interactions, influence of optical lattice potential, and dipolar interactions by numerically solving the corresponding nonlinear Gross-Pitaevskii (GP)/Nonlinear Schrdinger (NLS) equations in one-, two- and three-dimensions.

Data analysis on the daily temperature variations using various nonlinear time series analysis and statistical tools is carried out. Also investigations on agent-based models (eg. minority game model) in financial markets have been carried out.

Crystal Growth and Thin Film

The main objective of our research group is to grow high quality and technologically important single crystals and thin films. Important crystal growth techniques including Czochralski, Bridgman, Vertical dynamic gradient freeze, top seeded solution growth and low temperature solution growth have been developed to grow single crystals of organic, inorganic and semi-organic materials for nonlinear optical, piezoelectric and scintillator applications. Thin film deposition techniques including spray pyrolysis, spin coating and chemical bath deposition have been established for preparing thin films of transparent conducting oxide, organic-fullerene, metal-organic, perovskite materials for opto-electronic, solar cell, gas sensors and thermo-optical applications. Further, CGTF lab involves on the preparation of nanomaterials and nanocomposites for magnetic, ferroelectric, biological applications.

Some technologically sound materials developed in the CGTF lab

Single crystals for nonlinear optical applications

L-Lysine, L-arginine and L-proline based semi-organic materials using unidirectional solution growth method

Benzimidazole, Aminobenzophenone and 8-hydroxyquinoline by vertical Bridgman and vertical dynamic gradient freeze methods

Alkali metal and Melilite type borate materials by Czochralski method

Potassium niobate by top seeded solution growth method

Thin films for opto-electronic, solar cells, gas sensing and thermo-optical applications

Rare earth and transition metal ions doped CdO, SnO2 and CoFe2O4 thinfilms by Spray pyrolysis

Cd2SnO4, Cu0.87Se, CuTe, GaTe and Cu4Bi4S9 thin films by electron beam evaporation

Benzimidazole based metal-organic complexes by chemical bath deposition technique

Nanomaterials for magnetic and ferroelectric applications

Metal-ions substituted, surfactant and polymer assisted CoFe2O4, KNbO3 nanoparticles and nanocomposites by co-precipitation method

Benzimidazole based metal-organic nanoparticles by re-precipitation method

Lasers, Nonlinear Optics and Nanophotonics

This research group is engaged in the research of understanding light-matter interaction at nanoscale. Research activities are primly focused on the preparation and characterization of multifunctional nanomaterials suitable for photonics applications. The underlying aim is to understand the nanostructured materials: (i) nonlinear optical behavior under high intense laser light interaction and (ii) photovoltaic performance for solar cells. Materials chosen for investigation includes layered structures, borates, niobates and biomolecules that provides rich opportunities to unravel the different aspects of advanced optics such as NLO (Frequency conversion and optical limiting) and semiconductors (photoanodes and photocathodes). Major experiments that are performed in the research group includes: Preparation of organized self-assembled thin films by Langmuir-Blodgett method, Kurtz and Perry powder technique for SHG measurement, Z-scan experiment for investigating nonlinear optical phenomena and laser induced surface damage studies. Fabrication of devices such as frequency converters (for short wavelength laser generation), optical limiters (for laser safety devices) and bio sensitized tandem solar cells (for green energy harvesting) are being under taken. Few noteworthy outcomes of the researche groups include: Enhanced broadband optical limiting in functionalized solar exfoliated reduced graphene oxide- Ag-Fe2O3 and Au-Fe2O3 nanocomposites, Bacteriorhodopsin sensitized preferentially oriented one dimensional TiO2 nanorod polymorphs as efficient photoanodes for high-performance bio-sensitized solar cells, Improved production of bacteriorhodopsin from Halobacterium salinarum through direct amino acid supplement in the basal medium, Copper niobate based photocathodes for p-DSSCs and tandem solar cells.

Green and Clean Energy

GLOBAL civilization requires inexpensive, reliable, and sustainable energy sources. The energy demands of today's society will continue to grow due to heavy industrialization and growing population in third world countries. Currently, faced with a dwindling supply of fossil fuels and adverse global climate change, the search for a viable source of inexpensive renewable energy is quest of ongoing research. Among the clean energy sources, solar energy is one of the most promising and fastest growing renewable energy sources worldwide, particularly much suitable for countries like India as the mercury scorches 12 Hrs a day. Photovoltaic (PV) cells convert sunlight directly into electricity and offer enormous potential as a source of sustainable energy. A large variety of planar thin films and nanomaterials technologies including nanowire arrays, quantum dot, dye-sensitized, hybrid organic and perovskite solar cells are being actively researched due to their potentially low-cost production and possibility of higher performance than current crystal Si technology. The quest in developing functional materials with wide range of absorption in the visible solar spectrum and enhanced charge separation is vital in achieving high efficient solar cells.

The researchers in our department are focused on the development of sustainable fabrication routes for functional materials, characterize their functional properties and to determine sustainable, cost-effective processing for the fabrication of green energy harvesting devices. The novel green approaches include, Nanowire Solar cell, Dye-sensitized solar cell, Hybrid-organic polymers solar cell, Mesoscopic perovskite solar cells and PEC water splitting for Hydrogen generation.

Centre for High Pressure Research ( )
In order to encourage research in the area of high pressure and low temperature studies, in 2008, the university initiated a Centre for High Pressure Research in the Department of Physics. The Centre investigates experimentally various materials such as manganites, superconductors, diluted manganite semiconductors and organic conductors at extreme conditions like high pressure (3-6GPa), low temperature (2K) and high magnetic field (9Tesla). Correlated electrons with multi-degrees of freedom can host the correlation phenomena. Strong coupling exists between lattice strain and orbital ordering. The Centre has a facility to investigate the interplay of spin, charge and orbital coupling through hydrostatic and uniaxial pressure of various strongly correlated systems at low temperature and high magnetic field. The Centre has developed indigenous high pressure devices for transport measurements.

Centre for Nanoscience and Nanotechnology (
In view of initiating research in emerging and frontier topics, a Centre for Nanoscience and Nanotechnology has been established in 2008 in the Department of Physics by the University. The mission of the Centre is to promote, develop and binding interdisciplinary research activities in Bharathidasan University. Nano User Facility is created to extend the the state of the art experimental facilities to internal/external and industrial users at nominal cost.

Centre for nanoscience and nanotechnology has diversified its research interest in the following areas, (i) One-dimensional self-assembled nitride semiconductor (GaN, InN, AlN and its alloys, core-shell nanowires) nanostructures for LEDs, Solar cell and water splitting applications, (ii) 2D layered materials (Graphene, MoS2, WS2, NbS2, etc), (iii) Hybrid organic and inorganic Pervoskites for next generation photovoltaic applications, (iv) Photo-electrochemical assisted water splitting and (v) Drug Delivery and SERS detection of bio molecules.

Research Grant

General Grant for Research and Teaching from Agencies

Sl. No. Agency and Programme Duration Amount in Lakh (Rs.)
1. DDST-FIST- Level I Phase I 2000-2005 36.00
2. DST-FIST- Level I Phase II 2007 - 2012 118.00
3. UGC – SAP (DRS – Phase I) 2007 - 2012 47.00
4. UGC – Infrastructure (Non-SAP) 2007 – 2008 15.00
5. UGC – Infrastructure (DRS – I) 2008 – 2009 20.00
6. UGC-SAP-DRS-Phase II 2013 - 2018 75.00
7. DST-FIST- Level I Phase II 2016 - 2021 189.00
8. RUSA (R & I) 2017 - 2019 150.00

Research Grant from Agencies (Ongoing)

The Department of Physics has completed several research projects in the areas of nonlinear dynamics, biophysics, thin films, crystal growth, nonlinear optical materials, high pressure studies and Nanotechnology funded mainly by DST, UGC, CSIR, DAE, DRDO etc. At present, the following research projects are in progress..

Sl.No. Title of the Project
Agency Duration Amount in Lakh (Rs.)
01 DST-FIST Level I Phase II DST 2016 – 2021 189.00
02 UGC-SAP-DRS-Phase II UGC-SAP 2013 – 2018 75.00
03 One Dimensional semiconductor based (In,Ga)N photocatalytic hydrogen generation (Dr. K. Jeganathan) DRDO 2016 – 2019 60.71
04 III- Nitride semiconductor core-shell nanowire for next generation photovoltaic applications (Dr. K. Jeganathan) DST-Nanomission 2016 – 2019 33.41
05 Sustainable Energy Technologies - Investigation on the advanced functional materials for the next generation solar cell applications (Dr. K. Jeganathan, Dr. S.Arumugam, Dr. R. Ramesh Babu and Dr. T. C. Sabari Girisun) RUSA - R & I 2017 – 2019 150.00
06 Matter wave bright and vortex solitons in spin-orbit coupled Bose-Einstein condensates (Dr. P. Muruganandam) DST-SERB 2015 – 2018 22.89
07 Fabrication of Channelized Electron Transport Photo Electrodes for Bio Sensitized Solar Cells (Dr. T. C. Sabari Girisun) DST-SERB 2015 – 2018 24.36
08 Nanocomposite rGO/BBO thin films for human eye and photo-sensitive components protection from intense laser radiations (Dr. T. C. Sabari Girisun) CSIR 2017 – 2020 13.30
09 Synthesis and characterization of Magnetocalaoric studies of Hesusler alloys at extreme conditions of pressure (Dr. S. Arumugam) UGC-DAE 2018 – 2021 02.39
10 Study on the properties of Rasbha condensates spin orbit coupled BE in 2 and 3 dimensions (Dr. P. Muruganandam) CSIR 2018 – 2021 10.87

Number of ongoing projects and their total outlay
Projects : 10
Total outlay : Rs, 581.92 Lakhs

Research projects completed during last 5 years (2012-2017)

Sl.No. Title of the Project
Agency Duration Amount in Lakh (Rs.)
01 UGC-SAP LEVEL I UGC 2007-2012 47.00
02 Electronic Transport and Magnetic Studies in Heusler type Co-Fe-Si Alloy thin films at Low Temperature and High Magnetic Field. (Dr.S. Arumugam) DMRL-CARS 2012- 2013 10.00
03 Hydrostatic Pressure Effect on Manganites Single Crystals under High Pressure Low Temperature. (Dr.S. Arumugam) UGC 2011- 2014 03.50
04 Development of Uniaxial Pressure and Modified Bridgman Anvil Devices for Transport and Magnetic Measurements. (Dr.S. Arumugam) DST 2012 – 2014 60.00
05 Pressure Effect on the Properties of Organic Conductors and Pnictides Superconductors. (Dr.S. Arumugam) DST-JSPS 2012 – 2014 05.74
06 Development of Bridgman Anvil Pressure Cell for Electrical Resistivity and Thermoelectric Power Measurement and Investigation of Half Heusler Alloys. (Dr.S. Arumugam) DAE-BRNS 2012 – 2015 30.00
07 Synthesis, Characterization and Investigation of Heusler Alloys Based Magnetocaloric Materials at Extreme Conditions of Pressure, Temperature and Magnetic Field. (Dr.S. Arumugam) DRDO 2013 – 2016 54.00
08 Transport properties of Fe-based Superconductors under Extreme Conditions of High Pressure, Low Temperature and High Magnetic Field. (Dr.S. Arumugam) DST-SERB 2013 – 2016 21.80
09 Pressure Effect on Magnetic and Transport Properties of Highly Anisotropic Systems Spin Ladder and Decagonal Quasicrystalline Single Crystals. (Dr.S. Arumugam) DST - Indo-Russia 2014 – 2016 12.00
10 InGaN/GaN Nanowire based Solar cell (Dr. K. Jeganathan) AvH-Germany 2014 – 2015 16.00
11 Vertically aligned ZnO nanowires on p-type GaN for UV-Visible light emitting diode (LED) applications (Dr. K. Jeganathan) UGC 2012 – 2015 13.00
12 Investigation on the Mechanism, Efficacy and Genotoxic Risk of Gold Nanoparticles: Application in Photothermal Mediated Anticancer Therapy (Co-PI: Dr. K. Jeganathan) DBT - Nanomission 2010 – 2013 88.00
13 Fabrication and Characterization of Self-assembled 1D Semiconductor Nanostructures. (Dr. K. Jeganathan) DBT - Nanomission 2009 – 2013 215.00
14 Matter Wave Solitons in Multicomponent and Dipolar Bose-Einstein Condensates (Dr. P. Muruganandam) DST 2010 – 2013 215.00
15 Study on the Dynamics of Dipolar Condensates from the Numerical Simulations of Gross-Pitaevskii Equation (Dr. P. Muruganandam) CSIR 2010 – 2014 13.92
16 Fabrication and performance study of spray deposited low bandgap organic polymers and fullerene blend based solar cell devices (Dr. R. Ramesh Babu) DST-SERB 2013 – 2017 41.56
17 Top seeded solution growth of KNbO3 single crystals for nonlinear optical applications (Dr. R. Ramesh Babu) DST 2011 – 2015 29.40

Number of completed projects and their total outlay
Projects : 17
Total outlay : Rs, 675.81 Lakhs

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