Research On Characteristics And Applications Of Two-dimensional Photonic Crystal

In recent years, photonic crystal as a new type of artificial materials has attracted more and more attentions all over the world due to its peculiar advantages and unparalleled potential applications. This paper focuses on the investigation of the resonance excitation, equivalent negative refraction, optical gain of the two-dimensional photonic crystal and the application of equivalent negative refraction photonic crystal in target detection and imaging system. The specific research contents and conclusions of this paper include the following aspects:(1) Research on the transmissivity of the equivalent negative refraction photonic crystal composed of a triangular array of air holes. The effect of Bloch wave resonance is used in order to depict the transmission spectra of the photonic crystal. The relationship between the transmission spectra and different frequency of incident wave, layers and diameter of the air holes are studied. From the simulation, the resonance mode is obtained, that is the unique strong transmission peak at the resonance frequency. The transmissivities of two-dimensional photonic crystal with different shape of air holes are also investigated. These results will provide some theoretical foundation in the investigation of the all-optical switching by using the photonic crystal.(2) Research on the application of the negative refraction photonic crystal (NR-PC) in near-field optical-wave target detection and imaging. The characteristics of the focus-scanning scheme by using the NR-PC flat lens are studied with two-dimensional finite-difference time-domain method. The Rsoft software is used in order to simulate the detection and imaging of different targets. Resolution of the refocused backscattered optical wave from different targets is obtained. This investigation optimizes the performance of the target detection and imaging system, enlarges the application scope of it, and make it beneficial to the detection and imaging of small target.(3) Research on the optical-gain of two-dimensional nested rectangle photonic crystal based on the spontaneity emission. The concept of spontaneity emission and quantum theory are introduced to prove the unavoidable existence of a localized field with a defect mode and its basic properties. The relationship between the optical-gain and different doped media are investigated. From the investigation, it's clearly that the doped optical crystal can be used in dense WDM amplifiers in order to increase the transmission capability and distance.