1. Department of Electrical Engineering, Grove School of Engineering, City College of the City University of New York, 140th Street and Convent Avenue, New York, NY 10031, USA.
2. Physics Program, Graduate Center of the City University of New York, New York, NY 10016, USA.
3. Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78701, USA.
4. Department of Nanophotonics and Metamaterials, ITMO University, St. Petersburg 197101, Russia.
5. Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA.