A new mechanism for slow light is introduced by employing a symmetrical metal-cladding optical waveguide with millimeter scale. The basis is the anomalous dispersion of the ultrahigh-order modes near zero wavenumber, where the effective index approaches zero. Without use of any coherent or material resonance, this scheme is not subject to limitations of the delay-bandwidth product and can generate arbitrarily small group velocities over an unusually large frequency bandwidth.
© 2011 Optical Society of America
Original Manuscript: December 9, 2010
Revised Manuscript: February 14, 2011
Manuscript Accepted: February 18, 2011
Published: April 4, 2011
Wen Yuan, Cheng Yin, Honggen Li, Pingping Xiao, and Zhuangqi Cao, "Wideband slow light assisted by ultrahigh-order modes," J. Opt. Soc. Am. B 28, 968-971 (2011)