Publications 

1.         M.M. Bijeesh, P.K. Shakhi, Geetha K. Varier and P. Nandakumar, “Tuning the nonlinear optical absorption in Au/BaTiO3 nanocomposites with gold nanoparticle concentration” Optics and Laser Technology, 102 (2018) 207–212

2. M.M. Bijeesh, P.K. Shakhi, S. Arunkarthick, G.K. Varier, P. Nandakumar, Confocal imaging of single BaTiO3 nanoparticles by two-photon photothermal microscopy, Scientific. Reports. 7 (2017) 1643. doi:10.1038/s41598-017-01548-z.
3. Arunkarthick Samudram, Bijeesh M.Mangalassery, Meenal Kowshik, Nandakumar Patincharath, Geetha K. Varier  (2016), Passive permeability and effective pore size of HeLa cell nuclear membranes. Cell Biol Int, 40: 991–998. doi:10.1002/cbin.10640
4. S. Arunkarthick, M. M. Bijeesh, Geetha K. Varier, Meenal Kowshik and P. Nandakumar (2014)  Laser Scanning Photothermal Microscopy: Fast Detection and Imaging of Gold Nanoparticles. Journal of Microscopy, 256 (2), 111-116. 
5. S. Arunkarthick, M. M. Bijeesh, Anand Satya Vetcha, Nishith Rastogi, P. Nandakumar and Geetha K. Varier (2014) Design and construction of a confocal laser scanning microscope for biomolecular imaging. Current Science,  107 (12), 1965-1969
6. P.Nandakumar, A.Kovalev and A. Volkmer (2009), Vibrational imaging based on stimulated Raman Scattering Microscopy, New Journal of Physics 11, 2009, 033026.
7. P. Nandakumar, C. Vijayan, Y.V.G.S. Murti (2002) Absorption and photoluminescence studies on CdS quantum dots in Nafion, J. Appl. Phys. 91, 1509-1514.
8. P. Nandakumar, C. Vijayan, Y.V.G.S. Murti, M. Rajalaksmi and A.K. Arora (2001) Raman spectra of CdS quantum dots in Nafion: Longitudinal optical modes and confined acoustic modes, Physica E 11, 377-383.
9. A. Krishnan, S.K. Pal, P. Nandakumar, A. G. Samuelson, and P. K. Das (2001) Ferrocenyl donor-organic acceptor complexes for second order nonlinear optics, Chemical Physics 265, 313-322.
10. P. Nandakumar, C. Vijayan, Y.V.G.S. Murti, K. Dhanalakshmi, G. Sundararajan and K. S. Nair (2001), Synthesis and XRD characterization of CdS quantum dots in a perfluorinated ionomer (Nafion), Mater. Sci. & Engg. B 83, 61-65
11. P. Nandakumar, C. Vijayan, Y.V.G.S. Murti (2000) Quantum size effects on the third order nonlinear optical susceptibility of CdS quantum dots in Nafion, Optics Commun. 185, 457-465.
12. P. Nandakumar, C. Vijayan, Y.V.G.S. Murti, K. Dhanalakshmi and G. Sundararajan (1999) Proton exchange mechanism of synthesizing CdS quantum dots in Nafion, Indian J. Pure & Appl. Phys. 37, 239-241.
13. Y.V.G.S. Murti, P. Nandakumar and C. Vijayan  (1999) Experiments on jailed electrons, Physics Education, October-Decemeber, pp 229-235.
14. P. Nandakumar, A.R. Dhobale, Y. Babu,   M.D. Sastry, C. Vijayan, Y.V.G.S. Murti, K. Dhanalakshmi and G. Sundararajan (1998) Photoacoustic response of CdS quantum dots in Nafion, Solid State Commun., 106, 193-196
15. P. Nandakumar, C. Vijayan, Y.V.G.S. Murti, K. Dhanalakshmi and G. Sundararajan (1997), Preparation and characterization of CdS nanocrystallites in Nafion, Bull. Mater. Sci. 20, 579-582.