异质双周期结构光子晶体光学特性

利用传输矩阵法研究了异质双周期结构一维光子晶体的带隙结构和光学传输特性。此光子晶体能形成512~960 nm的含5个极窄透射峰的光子带隙。重点研究了一种材料为复折射率时的光学传输特性,以及当结构发生轴向应变时的"介观压光效应"。结果表明:当复折射率虚部为负时,透射峰随虚部绝对值的增大先增大后减小,甚至出现衰减;虚部为正时,发生吸收现象。当光子晶体发生轴向应变时,透射峰随应变量的增加呈现近似L形变化,应变量很小时透射率几乎线性减小,波长越大透射峰变化越缓慢。

Optical Characteristics of Dual-periodical Photonic Crystal Heterostructures

The characteristics of photonic band gap(PBG) of a one-dimensional(1-D) photonic crystal(PC) with dual-periodical heterostructures were studied by transfer matrix method.The results show that a PBG range from 512 nm to 960 nm appeared in the PC and five very narrow transmittance peaks exhibited in this gap.The authors put emphasis on the case of the PC with complex refractive index layers,as well as the meso-piezooptic effect of the strained PC.We found that the transmittance peaks gain when the imaginary part is negative.And with the increase of the absolute of the imaginary part,the transmittance peaks increase firstly then decrease even occur attenuation lastly.However,the transmittance peaks change into absorption if the imaginary part is positive.On the case of the strained PC,the variation of transmittance peaks presents a shape of L as the stain increases.