Funding for this research was provided by:
National Natural Science Foundation of China (NSFC) (61575122)
This article is maintained by: OSA - The Optical Society
Crossref DOI link to publisher maintained version: https://doi.org/10.1364/OL.43.001323
Article type: letter
Similarity check: Screened by Similarity Check
Peer review
Peer reviewed: Yes
Review process: Single blind
Publication History
Received: 27 December 2017
Accepted: 19 February 2018
Published: 12 March 2018
Copyright: © 2018 Optical Society of America