1. Department of Electronics and Communication Engineering, Siddaganga Institute of Technology, B.H. Road (affiliated to Visvesvaraya Technological University, Belagavi), Tumakuru, Karnataka 572103, India
2. Department of Physics, Siddaganga Institute of Technology, B.H. Road (affiliated to Visvesvaraya Technological University, Belagavi), Tumakuru, Karnataka 572103, India
3. Nanomaterials and Polymer Physics Lab, Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
4. Department of Nanotechnology, Siddaganga Institute of Technology, B.H. Road (affiliated to Visvesvaraya Technological University, Belagavi), Tumakuru, Karnataka 572103, India