1. Institute of Radio Physics and Electronics, University of Calcutta92 Acharya Prafulla Chandra RoadKolkata700 009India
2. Centre for Research in Nanoscience and Nanotechnology, University of CalcuttaJD BlockSector IIISalt LakeKolkata700 106India
3. University Grants Commission (UGC)-Basic Scientific Research (BSR) Faculty FellowNew DelhiDelhiIndia