1. Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec H3A 0E9,
Canada
2. Department of Physics, McGill University, 3600
University Street, Montreal, Quebec H3A 2T8, Canada
3. Department of Electrical Engineering and Computer Science, Center for Photonics and Multiscale Nanomaterials, University of Michigan,
Ann Arbor, Michigan 48109, USA