中红外区二氧化钛反蛋白石光子晶体的光子定域化研究

Photonic Localization in Reverse Opal Photonic Crystal Constituted by TiO_2 in Middle Infrared Band

为了得到二氧化钛反蛋白石光子晶体中影响光子定域化的规律,基于Mie散射理论和低浓度近似,对光子定域化参量进行了数值计算与理论分析,发现在该氧化物的剩余射线区内,入射波长和散射体大小对光子定域化有明显的影响.结果表明,在散射体浓度为10%,相对折射率大于3.8时,在中红外区13.3～15.3μm范围内出现了光子定域化现象,并随着散射体半径的增大,定域化区向长波方向移动;同时,定域化参量先增大后减小.研究结果为实验上在该类光子晶体中实现光子定域化现象提供了理论参考.

In oder to obtain the influence on the photonic localization in reverse opal photonic crystal constituted by TiO2,the photonic localization parameters are calculated numerically and analyzed theoretically,based on the Mie scattering theory and the low density approximation.It was found that the incidence wavelength and scattering body′ size have the obvious influence on localization phenomena in thesurplus ray zone of the oxide.The results show that the photonic localization phenomena appear in middle infrared band（13.3~15.3 μm） under the conditions of scatterer′s density of 10% and relative refractive index greater than 3.8.With the increase of the scattering body′s radius,the localization area shifts to long wavelength;simultaneously,the localization parameter firstly increases,then decreases.These research results can provide an academic reference to achieve experimentally the photonic localization phenomenon in the kind of photonic crystal.