title: Nondegenerate two-beam coupling in Kerr nonlinear photonic crystals.
abstract: We show that the energy-transfer efficiency by nondegenerate two-beam coupling in a one-dimensional Kerr-nonlinear superlattice can be enhanced by several orders of magnitude as compared with that in a homogeneous medium of the same nonlinearity and length. This significant enhancement utilizes the strong localized field at the band-edge state, two-frequency localized state, or defect state. Due to the intensity-induced index modulation, the bistability is observed, and because of the energy transfer between different wavelength components, the tristability behavior is induced.
authors.affiliation: Department of Physics and Institute of Nano Science and Technology (INST), The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Xie
authors.forename: Zhao-Qing
authors.initials: ZQ
authors.lastname: Zhang