title: Light wheel confined in a purely dielectric composite waveguide.
abstract: A properly designed composite waveguide consisting of a one-dimensional photonic crystal waveguide and a conventional dielectric waveguide is proposed for the realization of a localized "light wheel". Light confinedly rotating between the two waveguides is numerically demonstrated and explained physically in detail. A delocalized "light wheel" is found at the band gap edge caused by contra-directional coupling between the two waveguides. Because of this delocalized "light wheel" , the composite waveguide can be used to trap light as a cavity, and a quality factor of 9 x 10(3) is achieved as an example. The present structure is completely dielectric and thus easy to realize with a low loss.
authors.affiliation: Centre for Optical and Electromagnetic Research, Zhejiang University, Hangzhou, China.
authors.forename: Yu Qian
authors.initials: YQ
authors.lastname: Ye
authors.forename: Yi
authors.initials: Y
authors.lastname: Jin
authors.forename: Sailing
authors.initials: S
authors.lastname: He