In this paper， the transfer matrix method to study the transmission spectrum of complex permittivity defects symmetric one-dimensional ternary photonic The numerical results obtained in the first band gap and band gap of the transmission peaks A and B， the imaginary part of the defect layer is negative， whether adding a single defect layer or by adding the two-defect layer， the transmission peak B showed good gain， but the defect layer transmission rate to be about twice as large than the maximum transmission rate of a single defect Transmission peak A changes little significance; imaginary part of the defect layer is positive， by adding a single defect layer， we can see that the transmission peak A has an obvious decay process， changes in the transmission peak B， not Join pairs of defect layer， the transmission peaks A and B are a good gain and attenuation effects， not to This study provides some theoretical reference attenuator for photonic crystal single-channel filter amplifier and single-channel filter
Using the transfer matrix method， studied with complex dielectric constant defect symmetry of 1D Three element photonic crystal transmission Numerical simulation results are derived， in the first band gap and the second gap are respectively appeared transmission peak A and B， in the defect layer is the imaginary part is negative， whether adding a single defect layer or join double defect layers， the peaks of B have demonstrated good gain effect， but the double defect layers maximum transmittance ratio single defect layer maximum transmission to a While the transmission peak A changes little， no research significance; in the defect layer the imaginary part is positive， adding a single defect layer， can see the peaks of A has an obvious attenuation， transmission peak B changes little， not to Join two defect layer， transmission peak A and B had no good gain and attenuation effect， not to The research for the photonic crystal single channel filter amplifier and single channel filter and attenuator provides certain theory
