Pan, Zhiwen
Wondraczek, Lothar
Article History
Received: 19 February 2018
Accepted: 13 June 2018
First Online: 22 June 2018
Competing Interests
: The authors are co-inventors on a patent application on side-emitting waveguides based on core-radius modulations. Otherwise, they declare that they have no competing financial interests, or other interests that might be perceived to influence the results and discussion reported in this paper.