[1] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
[2] Nanyang Technol Univ, Singapore 637371, Singapore
[3] CUNY City Coll, New York, NY 10031 USA
[4] Univ Lancaster, Lancaster LA1 4YB, England
[5] Univ Rostock, Inst Phys, Albert Einstein Str 23, D-18059 Rostock, Germany
[6] Swiss Fed Inst Technol, Inst Theoret Phys, CH-8093 Zurich, Switzerland
[7] CUNY, Adv Sci Res Ctr, New York, NY 10031 USA
[8] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
[9] Univ Wurzburg, Wurzburg Dresden Cluster Excellence Ct Qmat, D-97074 Wurzburg, Germany
[10] Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy
[11] Univ Trento, Dipartimento Fis, I-38123 Povo, Italy
[12] Univ Paris Saclay, Ctr Nanosci & Nanotechnol, Palaiseau, France
[13] Univ Montreal, Montreal, PQ, Canada
[14] Univ Lille, UMR PhLAM Phys Lasers Atomes & Mol 8523, CNRS, F-59000 Lille, France
[15] Stanford Univ, Dept Elect Engn, Ginzton Lab, Stanford, CA 94305 USA
[16] Univ Maryland, Dept Mech Engn, College Pk, MD 20742 USA
[17] Univ Maryland, Inst Phys Sci & Technol, College Pk, MD 20742 USA
[18] Shanghai Jiao Tong Univ, Sch Phys & Astron, State Key Lab Adv Opt Commun Syst & Networks, Shanghai 200240, Peoples R China
[19] Peking Univ, State Key Lab Adv Opt Commun Syst & Networks, Sch Elect, Beijing 100871, Peoples R China
[20] Peking Univ, Frontiers Sci Ctr Nanooptoelect, Beijing 100871, Peoples R China
[21] Tohoku Univ, Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan
[22] Nokia Bell Labs, 600 Mt Ave, New Providence, NJ 07974 USA