1. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
2. Department of Electrical and Electronic Engineering, Jashore University of Science and Technology, Jashore 7408, Bangladesh
3. Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada
4. Department of Physics, University of Alberta, Edmonton, AB T6G 2H5, Canada