Analysis of high-quality modes in open chaotic microcavities

Journal Article · Mon Aug 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.023815· OSTI ID:20718214

Fang, W; Yamilov, A; Cao, H ^[1]

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1. Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208-3112 (United States)

We present a numerical study of the high-quality modes in two-dimensional dielectric stadium microcavities. Although the classical ray mechanics is fully chaotic in a stadium billiard, all of the high-quality modes show a 'strong scar' around unstable periodic orbits. When the deformation (ratio of the length of the straight segments over the diameter of the half circles) is small, the high-quality modes correspond to whispering-gallery-type trajectories and their quality factors decrease monotonically with increasing deformation. At large deformation, each high-quality mode is associated with multiple unstable periodic orbits. Its quality factor changes nonmonotonically with the deformation, and there exists an optimal deformation for each mode at which its quality factor reaches a local maximum. This unusual behavior is attributed to the interference of waves propagating along different constituent orbits that could minimize light leakage out of the cavity.

• OSTI ID: 20718214
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CHAOS THEORY
DEFORMATION
DIELECTRIC MATERIALS
INTERFERENCE
LASER RADIATION
NUMERICAL ANALYSIS
ORBITS
PERIODICITY
QUALITY FACTOR
TWO-DIMENSIONAL CALCULATIONS