Summary
International Symposium on Nonlinear Theory and Its Applications
2016
Session Number:C1L-B
Session:
Number:C1L-B-3
Asymmetric Emission Caused by Chaos-Assisted Tunneling and Synchronization in Two-Dimensional Microcavity Lasers
Yuta Kawashima, Susumu Shinohara, Satoshi Sunada, Takehiro Fukushima, Takahisa Harayama,
pp.-
Publication Date:2016/11/27
Online ISSN:2188-5079
Summary:
It has been experimentally reported that low threshold lasing and directional emission can be achieved at the same time by using chaos-assisted light emission in two-dimensional microcavity lasers (Aung et al., Appl. Phys. Lett. 107, 151106 (2015)). In the quadrupole optical microcavity, a resonant mode that localizes along a pair of stable triangular orbits is confined by total internal reflection. This strong light confinement leads to a low lasing threshold, while weak light emission is caused by chaos-assisted tunneling. The tunneling induces light intensity leakage from the stable triangular orbits to chaotic orbits that eventually escape from the cavity breaking the critical angle condition for total internal reflection, where the chaotic dynamics governed by unstable manifolds results in directional emission. In the experiment, asymmetric directional emission patterns have been observed despite the symmetry of the quadrupole cavity. Based on numerical simulations, we show that the asymmetric emission patterns can be explained by the locking of two different parity modes associated with the triangular orbits.