title: Surface-roughness-induced contradirectional coupling in ring and disk resonators.
abstract: Reflections that are due to random surface roughness in periodic structures such as dielectric rings and disks inherently phase match forward- and backward-propagating modes. Small reflections are thus considerably enhanced and may impair the performance of traveling-wave resonators. In addition, such contradirectional coupling leads to a splitting of the resonant peak. These effects are studied analytically.
authors.forename: B E
authors.initials: BE
authors.lastname: Little
authors.forename: J P
authors.initials: JP
authors.lastname: Laine
authors.forename: S T
authors.initials: ST
authors.lastname: Chu