Nonorthogonal pairs of copropagating optical modes in deformed microdisk cavities

Details Nonorthogonal pairs of copropagating optical modes in deformed microdisk cavities Nonorthogonal pairs of copropagating optical modes in deformed microdisk cavities

2011-05-19

arxiv.org/abs/1105.3819v2

Phys. Rev. A 84, 023845 (2011)

Physics

Optics

Scientific paper

10.1103/PhysRevA.84.023845

Recently, it has been shown that spiral-shaped microdisk cavities support highly nonorthogonal pairs of copropagating modes with a preferred sense of rotation (spatial chirality) [Wiersig et al., Phys. Rev. A 78, 053809 (2008)]. Here, we provide numerical evidence which indicates that such pairs are a common feature of deformed microdisk cavities which lack mirror symmetries. In particular, we demonstrate that discontinuities of the cavity boundary such as the notch in the spiral cavity are not needed. We find a quantitative relation between the nonorthogonality and the chirality of the modes which agrees well with the predictions from an effective non-Hermitian Hamiltonian. A comparison to ray-tracing simulations is given.

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