1. Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA
2. Department of Chemistry, Biology, and Health Sciences, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, USA
3. Department of Physics, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA
4. Department of Chemistry, University at Nebraska-Lincoln, Lincoln, Nebraska 68588, USA