Overview

Overview

Dr. G. Shanmugam is an Associate Professor at SSMIET in department of Physics. He has 8 years of teaching experience in various engineering colleges and Universities. He is working as a faculty in SSMIET for the past 3 Years 2 Months. His research is mainly focused on design, crystal growth and characterization of nonlinear optical materials and semiconducting materials for optical applications.

Contact:  shanekanna@gmail.com    +91-9488144551

Education

  • Ph.D (Physics), Anna University, Chennai, Tamil Nadu, 2013.
  • M.Phil (Physics), Madurai Kamaraj University, Madurai, Tamil Nadu, 2007.
  • M.Sc (Physics), Madurai Kamaraj University, Madurai, Tamil Nadu, 2006.
  • B.Sc (Physics), Bharathidasan University, Madurai, Tamil Nadu, 2004.
  • PGDCA (Computer Applications), BDPS Institution, Trichy, 2004.

Research

Shanmugam’s area of research is broadly focused on design and development of Organic and semi-organic nonlinear optical materials and semiconducting materials for optical applications.

The invention of high intensity laser has opened many innovative ways to explore the nature of the matter and its interaction with optical radiation. In recent years much attention has been devoted to optical materials with high second order nonlinearities owing to their potential use in numerous modern research fields like nonlinear optics (NLO), electro optic modulation (EOM), parametric light generation, optical data storage, high speed telecommunications and terahertz (THz) wave generation and detection, etc.

Although various species of NLO materials are available, organic crystalline materials easily preponderate their inorganic, thin film, polymeric and other counterparts due to their highly aligned and stable orientation of NLO chromophores in crystal lattice, large electro optic coefficient, small dielectric constant and loss, fast response time, inherent synthetic flexibility, ease of fabrication and integration into devices, etc. Elucidating the relationship between the compositions, structure and properties of materials, and developing new materials according to this relationship are two of the most important issues in the area of materials science. Moreover, high quality NLO crystals with the ability to grow to the required dimensions in the laboratory are much needed to realize these applications.

As a result of intensive search, three different organic materials have been identified as potential NLO materials namely Piperidinium p-Hydroxybenzoate (PDPHB), Pyrrolidinium p-Hydroxybenzoate (PYPHB) from benzoate family and 4-methylanilinum p-toluenesulfonate (PMPT) from sulfonate family. In addition, Morpholin-4-ium p-aminobenzoate (MPABA) from benzoate family has been invented as a novel NLO material from benzoate family. These materials are derived from readily available and relatively inexpensive starting materials i.e. bases and acids. The synthesis, solubility and growth of all the four selected materials have been performed.

The seeding region of temperature for different solution concentrations are predicted through MSZW studies. All the four crystals are grown using slow cooling solution growth technique. The grown crystals are subjected to single crystal XRD, powder XRD, microanalysis and vibrational, resonance spectroscopic studies to confirm their formation.

The lower cut-off wavelength, transmission window and band gap of all four crystals have been explored through UV-Visible-NIR spectrum. The maximum theoretical transmittance of the crystals are also calculated by using their refractive indices values and are reported.The SHG efficiency, phase matchability, coherence length have been analyzed through Kurtz-Perry powder SHG test and the results are compared with standard NLO materials such as KDP and urea. The melting point, decomposition behavior and thermal stability have been studied through TG/DTA and DSC thermograms. The mechanical hardness and anisotropic nature of the grown crystals have been studied using Vickers microhardness indentation tester and the results are illustrated with tabulations. As all the four crystals are organic dielectric materials, the dielectric parameters such as dielectric constant, dielectric loss and electrical conductivity have been studied along with their temperature and frequency dependences. The dielectric parameters are also compared with various technologically important organic and inorganic NLO materials.

As the development of NLO materials for device applications essentially needs a multidisciplinary effort involving both theoretical and experimental studies in the basic sciences and engineering, quantum chemical calculations are also carried out to predict the nature of electric dipole moment, polarizability, chemical hardness, charge distribution, nucleophilic and electrophilic reactive sites of the selected molecules using density functional theory (DFT). The DFT calculations are performed using the GAUSSIAN 03 program package with most popular DFT model Becke3-Lee-Yang-Parr (B3LYP) at the level of POPLE basis set 6-31G (d, p). These details could be useful to study their suitability for various applications such as NLO, EOM and THz device fabrications.

Publications

1)      Shanmugam, G., Ravi Kumar, K., Sridhar, B. and Brahadeeswaran, S. “Synthesis, structure, growth and characterization of a novel organic NLO single crystal: Morpholin-4-ium p-aminobenzoate”, Mater. Res. Bull., Vol. 47, No. 9, pp. 2315-2323, 2012.

2)      Shanmugam, G. and Brahadeeswaran, S. “Spectroscopic, thermal and mechanical studies on 4-methylanilinium p-toluenesulfonate- a new organic NLO single crystal”, Spectrochim. Acta Part A., Vol. 95C, pp. 177-183, 2012.

3)      Shanmugam, G., Thirupugalmani, K., Kannan, V. and Brahadeeswaran, S. “Spectroscopic, quantum-chemical and X-ray diffraction studies of Piperidinium p-Hydroxybenzoate -combined experimental and theoretical studies on a novel NLO crystal”, Spectrochim. Acta Part A., Vol. 106C, pp. 175-184, 2013.

4)      Shanmugam, G., Thirupugalmani, K., Rakhikrishna, R., Philip, J. and Brahadeeswaran, S. “Thermophysical, mechanical and dielectric studies on piperidinium p-hydroxybenzoate – A novel organic NLO single crystal”, J. Thermal. Anal. Colorim. Vol. 14, pp. 1245-1254, 2013.

5)      Shanmugam, G., Besley, M.S., Isakov, D., de Matos Gomes, E., Nehru, K. and Brahadeeswaran, S. “Spectroscopic, Nonlinear Optical and Quantum Chemical Studies on Pyrrolidinium p-Hydroxybenzoate -a Phase Matchable Organic NLO Crystal”, Spectrochim. Acta Part A., Spectrochim. Acta Part A., Vol. 114, pp. 284-292, 2013.

6. Thriupugalmani, K., Shanmugam, G. Kannan, V. and Brahadeeswaran, S. “Rapid growth of thin and flexible organic semiconductor single crystal Anthracene by solution growth technique for device fabrication”,Journal of Crystal Growth, Vol.413,pp.67-70, 2015.

7. Kannan,V., Thriupugalmani, K., Shanmugam, G. and Brahadeeswaran, S. “Synthesis, Growth, Thermal, Optical, Mechanical and Dielectric Studies of N–Succinopyridine: An Organic Nonlinear Optical Single Crystal”, Thermal. Anal. Colorim. Vol.115, pp.731-742, 2014.

8. Thirupugalmani, K., Karthick, S., Shanmugam, G., Kannan, V., Sridhar, B., Nehru, K. and Brahadeeswaran, S. “Second- and third-order nonlinear optical and quantum chemical studies on 2-amino-4-picolinium-nitrophenolate-nitrophenol: A phasematchable organic single crystal”, Optical Materials, 49, pp.158-170, 2015.

9. Shanmugam, G., Thirupugalmani, K., Karthick, S., Kannan, V., and Brahadeeswaran, S. “Physical Properties of Morpholin-4-ium p-aminobenzoate: A Novel Organic NLO crystal from   Benzoate Family”, Journal of Chemical and Pharmaceutical Sciences, 9,132-133, 2016.

10. Natarajan, S., Shanmugam, G., Martin Britto Dhas, S.A. “Growth and characterization of a new semi organic NLO material: L-tyrosine hydrochloride”, Cryst. Res. Vol. 43, pp. 561, 2008.

11. Natarajan, S., Shanmugam, G., Martin Britto Dhas, S.A., Athimoolam, S. “catena-Poly[[[triaquacalcium(II)]-di–glycine-4O:O‘] diiodide]”, Acta Cryst. Vol. 63, pp. 2897, 2007.

12. Shanmugam, G., Thirupugalmani, K., Karthick, S., and Brahadeeswaran, S. “Spectral, Quantum Chemical and Physical Studies on Morpholin-4-ium p-aminobenzoate –A Novel Phase Matchable NLO Crystal”, Sacred Heart Journal of Science and Humanities, Vol-5, 77-100, 2014.

Others

PATENT (NATIONAL)

Title: Rapid Growth of Thin and Flexible Organic Semiconductor Single Crystals Using Modified Solution Technique,

  1. Brahadeeswaran, K. Thirupugalmani, G. Shanmugam, Patent No. 1584/CHE/2012; Complete filing date: 23/04/2012

Book Publication

G.Shanmugam and S. Brahadeeswaran. “Growth and characterization of certain benzoate and sulfonate crystals – Organic NLO materials”, LAP LAMBERT Academic Publishing, 2014. (ISBN: 978-3-659-60723-3)

Supervisor

Anna University Chennai recognized supervisor (2570849)

 

 

PAPER PRESENTATION

1)      Shanmugam, G., Thirupugalmani, K., Kannan, V. and Brahadeeswaran, S. “Structure, Growth, Optical & Quantum chemical studies on a Novel organic NLO single crystal: Morpholin-4-ium p-aminobenzoate”, Proceedings of the International Conference on Research in Condensed Matter Physics (ICCMP-2012), October 1-3, 2012, University of Madras, Chennai. (ISBN: 978-93-82062-63-9).     

  • Shanmugam, G. and Brahadeeswaran, S. “Synthesis, Crystal Growth, Structure, Spectroscopic and Physicochemical Studies on a novel NLO material -Morpholi-4-ium p-aminobenzoate”, Proceedings of the National Seminar on Novel Materials (NSNM 2013), March 8, 2013, Shivani Engineering College, Tiruchirappalli.
  • Shanmugam, G. and Brahadeeswaran, S. “Growth, Spectroscopic and Physicochemical Studies on 4-Methylanilinium p-Toluenesulfonate: A New Organic NLO Crystal”, Proceedings of the XVII National Seminar on Crystal Growth (XVII – NSCG – 2013), January 9-11, 2013, Anna University, Chennai.
  • Shanmugam, G. and Brahadeeswaran, S. “Growth, Spectroscopic and Physicochemical Studies on 4-Methylanilinium p-Toluenesulfonate: A New Organic NLO Crystal”, Proceedings of the National Seminar on Novel Materials (NSNM 2013), March 8, 2013, Shivani Engineering College, Tiruchirappalli.
  • Shanmugam, G., Thirupugalmani, K. and Brahadeeswaran, S.Growth, Spectroscopic, Quantum Chemical and Optical Studies on Piperidinium p-Hydroxybenzoate – An Organic NLO Single Crystal”, National Seminar on Recent Trends in Crystal Growth and Nano Materials (NSCGNM-2013), March 13-15, 2013, National College, Tiruchirappalli.
  • Shanmugam, G. and Brahadeeswaran, S. “Growth, Spectroscopic and Optical Studies on Pyrrolidinium p-Hydroxybenzoate- an organic NLO crystal from benzoate family”, Proceedings of the National Seminar on Novel Materials (NSNM 2013), March 8, 2013, Shivani Engineering College, Tiruchirappalli.
  • Shanmugam, G., Thirupugalmani, K., Kannan, V. and Brahadeeswaran, S. “Physical Properties of Morpholi-4-ium p-aminobenzoate- A Novel Organic NLO Crystal from Benzoate Family”, National Conference on Advanced Materials and Applications (NCAMA 2013), April 4-5, 2013, National Institute of Technology, Tiruchirappalli.
  • Structure, Growth, Optical & Quantum chemical studies on a Novel organic NLO single crystal: Morpholin-4-ium p-aminobenzoate presented at International conference on research in condensed matter physics (ICCMP-2012) conducted by Department of Theoretical Physics, University of Madras, Guindy Campus, Chennai.
  • Crystal Growth and Characterization of two new semi-organic NLO Materials L-tyrosine hydrochloride and sodium hydrogen tartrate monohydrate presented at National level conference in “Sivanthi Athithanar College of Arts and Science”, Thiruchendur.

 

 

 

 

 

WORKSHOPS PARTICIPATED

  • International Workshop on Crystal Growth and Characterization of Advanced Materials and Devices (IWCGCMD), December, 16-19, 2012, Anna University, Chennai.
  • Convergence-2012, December, 21-22, 2012, National Institute of Technology, Tiruchirappalli.
  • Indo-Japan Workshop, Crystal Growth Center, Anna University, Chennai, Dec 07-10, 2005.
  • Quality improvement training program, July 06-08, 2008, MSEC, kilakarai.

 

 

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