Novel conical reflection of light by a thick three-layered metal-clad optical waveguide is observed. A symmetrical metal-cladding optical waveguide is used, which exhibits extraordinary conical reflection during free-space coupling of light to the waveguide. The phenomenon is attributed to the leakage of excited ultrahigh-order guided modes and their inter- and intramode coupling interaction.
© 2013 Optical Society of America
Original Manuscript: May 14, 2013
Revised Manuscript: August 8, 2013
Manuscript Accepted: August 10, 2013
Published: August 30, 2013
Yuanlin Zheng, Zhuangqi Cao, and Xianfeng Chen, "Conical reflection of light during free-space coupling into a symmetrical metal-cladding waveguide," J. Opt. Soc. Am. A 30, 1901-1904 (2013)