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Chinese Journal of Quantum Electronics

Research on polaritons in photonic crystal with absorptive type of dispersive medium's layer

Llao Qing-hua

Published Jan 1, 2006• 0 citations
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Abstract

The transfer matrix, which represents the dispersive medium's layer, can be rigorously obtained by using Lorentz model and considering boundary conditions. The detailed investigation on polaritons in a symmetric photonic crystal with absorptive type of dispersive medium's layer is presented by adjusting parameters of the dispersive medium's layer. It's found that the absorptive type of dispersive cavity and reinforced dispersive cavity may demonstrate similar properties in normal modes coupling, the homogeneous broadening effect, and the detuning effect. But there exists evident differences in transmitted intensity and frequency shift. Finally, the optical bistability in one-dimensional symmetric photonic crystal both with absorptive type of dispersive medium's layer and with Kerr nonlinear layer is also investigated. It's found that optical bistability threshold of the photonic crystal with dispersive medium layer is a little lower than that of structure without dispersive medium laver.

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The transfer matrix, which represents the dispersive medium's layer, can be rigorously obtained by using Lorentz model and considering boundary conditions. The detailed investigation on polaritons in a symmetric photonic crystal with absorptive type of dispersive medium's layer is presented by adjusting parameters of the dispersive medium's layer. It's found that the absorptive type of dispersive cavity and reinforced dispersive cavity may demonstrate similar properties in normal modes coupling, the homogeneous broadening effect, and the detuning effect. But there exists evident differences in transmitted intensity and frequency shift. Finally, the optical bistability in one-dimensional symmetric photonic crystal both with absorptive type of dispersive medium's layer and with Kerr nonlinear layer is also investigated. It's found that optical bistability threshold of the photonic crystal with dispersive medium layer is a little lower than that of structure without dispersive medium laver.
The optical transfer matrix theory is used to research the transmission characteristics of an one-dimensional photonic crystal.If the defect layer is nonlinear medium which is saturatedly absorbed,the optical bistable properties are studied based on the sensitivity change of incident light transmittivity of nonlinear medium.And the analytical formula related to the input-output of the light intensity is deduced.When the saturated absorption is above a certain value,the optical bistablity will appear in the system.Finally the change law of the incident light threshold value of the optical bistablity is studied.
We study the optical bistable properties in one-dimensional photonic crystal with symmetric structure (AB)N(D)M(BA)N, where A is high refractive index medium, B is low refractive index medium, D is defect layer, N is the number of layer periods at the left and right of the defect layer. M determines the thickness of the defect layer with Kerr medium. First, we analyze mechanisms producing bistability by the structure consisted of a nonlinear layer sandwiched between Bragg reflectors. Then by using the transfer matrix method, we calculate numerically the threshold value of the bistability switching in one-dimensional photonic crystals with structure (AB)N(D)M(BA)N. The investigations show that the number of layer periods (N) and the thickness of the defect layer (M) influence the threshold value of the bistability switching. We confirm the parameter of the bistability switching to produce the lower threshold value.
The normal-mode coupling dispersive medium in a symmetric one-dimension photonic crystals(1D PCs) was studied.The frequency shift effect,homogeneous broadening effect,and the detuning effect of the normal(coupled) modes can be well controlled by adjusting the parameters of the dispersive medium.It is found that the separation between the two transmission peaks enlarges with increasing the dimensionless coupling strength.It implies that we can modulate the frequency shift of the dispersive defect by adjusting the parameter of the dispersive medium.The broadening effect of normal coupled modes is related to the reduced oscillator HWHM linewidth.Detuning effect of dispersive layer will make one peak rapidly drop and the other relatively much higher.It can be understood by Fabry-Perot cavity analysis.
Considering a one-dimensional photonic crystal covering nonlinear medium layer,the transfer matrix algorithm for one-dimensional inhomogeneous medium was applied to found the theoretical analysis model for the electromagnetic wave propagations.The plane electromagnetic waves solutions were obtained.And numerical realization method was also given out.The investigations show that the method simulated exactly the behavior of electromagnetic wave propagating in 1-D nonlinear medium.And optical bistable switching of 1-D photonic crystal with nonlinear medium layer covering can be shown validly and concisely.
In this paper, a one-dimensional photonic crystal composed of two defect layers with optical gain is considered. We place a nonlinear layer between two defect layers. Using the modified transfer matrix method, the effect of increasing the optical gain on the bistablity threshold is studied in both normal and oblique incidences. Our calculations show that the threshold of bistability decreases with increasing the optical gain. However, increasing the optical gain above a particular value leads to the enhancement of bistability threshold.
The transmittance of defect mode in one dimension photonic crystals with nonlinear absorptional dielectric materials was deduced by the transfer matrix theory.The intensity enhancement factor of localized light in defect layer had also been obtained,which increases exponentially with the number of layers in a photonic crystal.The numerical calculation shows that a photonic crystal with saturable absorption dielectric materials in the defect layer has the property of bistablility.The threshold of input intensity to bring about bistablility is decided by parameters of refractivity?saturation intensity of defect layer and decreases exponentially with the number of layers in a photonic crystal.