Nonlinear switching of low-index defect modes in photonic lattices

作者：Ye Fangwei^*; Kartashov Yaroslav V; Vysloukh Victor A; Torner Lluis

来源：Physical Review A, 2008, 78(1): 013847.

DOI：10.1103/PhysRevA.78.013847

• All-optical switching
• Channel spacings
• Coupling length
• Defect modes
• Defocusing
• Directional couplers
• Lattice parameters
• Non linearities
• Non-linear regimes
• Nonlinear switching
• Optical lattices
• Photonic band gaps
• Photonic lattices
• Switching power
• Total internal reflection

We address nonlinear signal switching between two low-index defect channels induced in periodic optical lattices. In contrast to conventional directional couplers, where the guiding mechanism is total internal reflection or refraction, in such a Bragg-type coupler, the guidance is of a photonic-band-gap origin. The coupling length in the low-index coupler is controlled by the lattice parameters and by the channel spacing. In the nonlinear regime the Bragg-type coupler behaves as an all-optical switch, exhibiting a remarkable difference of switching power for focusing versus defocusing nonlinearity. ? 2008 The American Physical Society.

• 出版日期2008