Rotation-induced mode coupling in open wavelength-scale microcavities
نویسندگان
چکیده
We study the interplay between rotation and openness for mode coupling in wavelength-scale microcavities. In cavities deformed from a circular disk, the decay rates of a quasidegenerate pair of resonances may cross or anticross with increasing rotation speed. The standing-wave resonances evolve to traveling-wave resonances at high rotation speed, however both the clockwise (CW) and counterclockwise (CCW) traveling-wave resonances can have a lower cavity decay rate, contrary to the intuitive expectation from the rotation-dependent effective index. With increasing rotation speed, a phase locking between the CW and CCW wave components in a resonance takes place. These phenomena result from the rotation-induced mode coupling, which is strongly influenced by the openness of the microcavity. The possibility of a nonmonotonic Sagnac effect is also discussed.
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