1. Department of Electrical Engineering, City College of the City University of New York, 160 Convent Avenue, New York, New York 10031, USA
2. Department of Physics, City College of the City University of New York, 160 Convent Avenue, New York, New York 10031, USA
3. Physics Program, Graduate Center of the City University of New York, New York, New York 10016, USA
4. Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, USA