The effective third order nonlinear susceptibility, transmission dynamics and the corresponding mechanism near the central defect mode of a one-dimensional photonic crystal made of ZnS/YF₃ are experimentally investigated. The effective third order nonlinear susceptibility (x⁽³⁾_eff = 3.75 x 10^-9esu) of the 1D PhC sample is found to be four order of magnitude larger than bulk ZnS. This large enhancement is brought by the electric field localization around the central defect layer and the high density of mode near the central defect mode. Theoretical study of optical properties including transmission, effective refractive index, density of mode and electric field intensity distribution of a one-dimensional photonic crystal by using transfer matrix method is presented. The degenerate two-be...[ Read more ]

The effective third order nonlinear susceptibility, transmission dynamics and the corresponding mechanism near the central defect mode of a one-dimensional photonic crystal made of ZnS/YF₃ are experimentally investigated. The effective third order nonlinear susceptibility (x⁽³⁾_eff = 3.75 x 10^-9esu) of the 1D PhC sample is found to be four order of magnitude larger than bulk ZnS. This large enhancement is brought by the electric field localization around the central defect layer and the high density of mode near the central defect mode. Theoretical study of optical properties including transmission, effective refractive index, density of mode and electric field intensity distribution of a one-dimensional photonic crystal by using transfer matrix method is presented. The degenerate two-beam phase conjugation using the photonic crystal sample as the nonlinear medium is demonstrated experimentally for the first time. The temporal response of the phase conjugation generated by degenerate four wave mixing is found to be containing a fast and a slow component. The fast component is probably attributed to ultrafast response of the virtual state by one photon process or the rapid dephasing of the two-photon generated real states by the carrier-phonon scattering or carrier-carrier scattering. The slow component tail is attributed to the recombination of the real carriers created by two photon absorption. Second and third harmonic generation with the photonic crystal sample serving as the generation medium is demonstrated with nearly phase matched condition. A new multiple defects one-dimensional photonic crystal sample of ZnS/YF₃ is designed to gain the enhancement from both the near phase matched condition and the optical properties of the photonic band structure around the region of multiple defect modes for simultaneous second and third harmonic generation.