1. Department of Electrical and Electronic Engineering, University of Dhaka, Dhaka-1000, Bangladesh
2. Department of Robotics and Mechatronics Engineering, University of Dhaka, Dhaka-1000, Bangladesh
3. Department of Electrical and Computer Engineering, University of California, Santa Cruz, CA-95064, USA
4. Dhaka University Nanotechnology Center, University of Dhaka, Dhaka-1000, Bangladesh