Mechanism of unidirectional emission of ultrahigh Q Whispering Gallery mode in microcavities

Details Mechanism of unidirectional emission of ultrahigh Q Whispering Gallery mode in microcavities Mechanism of unidirectional emission of ultrahigh Q Whispering Gallery mode in microcavities

2009-08-25

arxiv.org/abs/0908.3531v1

Physics

Optics

Scientific paper

The mechanism of unidirectional emission of high Q Whispering Gallery mode in deformed circular micro- cavities is studied and firstly presented in this paper. In phase space, light in the chaotic sea leaks out the cavity through the refraction regions, whose positions are controlled by stable islands. Moreover, the positions of fixed points according to the critical line in unstable manifolds mainly determines the light leak out from which refraction region and the direction of the emission. By controlling the cavity shape, we can tune the leaky regions, as well as the positions of fixed points, to achieve unidirectional emission high Q cavities with narrow angular divergence both in high and low refractive index mater

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