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Opt Lett. 1997 Jan 1;22(1):4-6.

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.

PMID:
18183084
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