1. a Department of Electrical and Computer Engineering , University of Colorado at Colorado Springs , Colorado Springs, CO, 80933-7150, U.S.A.
2. b Structured Materials Industries, Inc. , 201 Circle Drive North, Unit #102, Piscataway, NJ, 08854, U.S.A.
3. c Materials Science and Engineering Program, Department of Chemical, Materials, and Biomolecular Engineering , University of Connecticut , Storrs, CT, 06269, U.S.A.