1. School of Nanoscience and Technology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
2. Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
3. Instability and Soft Patterning Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India