Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST) (104-2112-M-006-006-MY2, 104-2738-M-006-003)
This article is maintained by: OSA - The Optical Society
Crossref DOI link to publisher maintained version: https://doi.org/10.1364/OL.43.000126
Article type: letter
Similarity check: Screened by Similarity Check
Peer review
Peer reviewed: Yes
Review process: Single blind
Publication History
Received: 9 October 2017
Accepted: 30 November 2017
Published: 22 December 2017
Copyright: © 2017 Optical Society of America