Author Affiliations

S. Song,¹ N. Healy,² U. Österberg,³ M. Fokine,⁴ T. Sørgård,¹ A. C. Peacock,⁵ and U. J. Gibson^1,4

¹Physics Dept. Norwegian Univ. of Science ad Technology, 7491 Trondheim, Norway

²School of Electrical and Electronic Engineering, Merz Court, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK

³Dept. of Electronic Systems, Norwegian Univ. of Science ad Technology, 7491 Trondheim, Norway

⁴Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 10044 Sweden

⁵Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, Hampshire SO17 1BJ, UK