光子晶体超窄带滤波器

本文利用光学传输矩阵法研究了一种类似于谐振腔结构的光子晶体.研究发现在这种光子晶体的光子带隙的中央存在一个极窄的透光窗口,窗口的宽度在红外波段1500nm附近可以做到0.0001nm以下,窗口内的透光率峰值可以接近100%,窗口以外的区域的透光率可以做到0.01%以下.通过改变所研究结构中的周期厚度、中间夹层厚度、两边光子晶体的周期重复数和波的入射角可以改变窄带透过窗口的位置和窄带的宽度.这种光子晶体可以用来制作超窄带滤波器,有望在光通信超密度波分复用技术和光学信息精密测量技术当中获得应用.

PHOTONIC CRYSTAL SUPER NARROW OPTICAL FILTERS

Authors present a photonic crystal super narrow band optical filter.It is a kind of photonic crystal with defect.The defect is so designed that a narrow pass band is opened in the photonic band gap region.Optical transmission matrix method is used to simulate the filter,Authors numerical investigation shows that the structure investigated can be served as a super narrow pass band optical filter.The pass band obtained can be less than 0.0001nm near the infrared 1500nm.In ideal cases,the optical transmission in the pass band is higher than 99.99%.This means a very low insert energy loss.It is greatly superior to other kind narrow band optical filters.This kind of photonic crystal super narrow band optical filter may find applications in super dense wavelength division multiplexing (SDWDM) for optical communications and precise optical measurement.