1. Centre for Research in Nanoscience & Nanotechnology; University of Calcutta, Block-JD-2, Sector-III, Salt Lake; Kolkata- 700106 India
2. Department of Applied Science; Haldia Institute of Technology, Dist. Purba Medinipur; Haldia- 721657 India
3. Department of Applied Optics and Photonics; University of Calcutta, Block-JD-2, Sector-III, Salt Lake; Kolkata- 700106 India
4. S.N. Bose National Centre for Basic Science, Block-JD, Sector-III, Salt Lake; Kolkata- 700106 India