Yong-Hun Kim, Sung-Taek Hur, Chang-Sub Park, Kyung-Woo Park, Suk-Won Choi, Shin-Won Kang, and Hak-Rin Kim*, Optics Express, 2011,19, 17427.
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-18-17427