1. Advanced Technology Development Centre, IIT Kharagpur, Kharagpur 721302, India
2. Department of Physics, IIT Kharagpur, Kharagpur 721302, India
3. Technical Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
4. Materials Science Centre, IIT Kharagpur, Kharagpur 721302, India
5. School of Medical Science and Technology, IIT Kharagpur, Kharagpur 721302, India