title: Nonlinear resonance-assisted tunneling induced by microcavity deformation.
abstract: Noncircular two-dimensional microcavities support directional output and strong confinement of light, making them suitable for various photonics applications. It is now of primary interest to control the interactions among the cavity modes since novel functionality and enhanced light-matter coupling can be realized through intermode interactions. However, the interaction Hamiltonian induced by cavity deformation is basically unknown, limiting practical utilization of intermode interactions. Here we present the first experimental observation of resonance-assisted tunneling in a deformed two-dimensional microcavity. It is this tunneling mechanism that induces strong inter-mode interactions in mixed phase space as their strength can be directly obtained from a separatrix area in the phase space of intracavity ray dynamics. A selection rule for strong interactions is also found in terms of angular quantum numbers. Our findings, applicable to other physical systems in mixed phase space, make the interaction control more accessible.
authors.affiliation: School of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
authors.forename: Hojeong
authors.initials: H
authors.lastname: Kwak
authors.affiliation: School of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
authors.forename: Younghoon
authors.initials: Y
authors.lastname: Shin
authors.affiliation: School of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
authors.forename: Songky
authors.initials: S
authors.lastname: Moon
authors.affiliation: Korea Research Institute of Standards and Science, Daejeon 305-340, Korea.
authors.forename: Sang-Bum
authors.initials: SB
authors.lastname: Lee
authors.affiliation: Russia Science Seoul, Korea Electrotechnology Research Institute, Seoul 121-912, Korea.
authors.forename: Juhee
authors.initials: J
authors.lastname: Yang
authors.affiliation: School of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
authors.forename: Kyungwon
authors.initials: K
authors.lastname: An