阐述了利用光子晶体单点缺陷微腔来提高Ge/Si纳米岛发光效率的机理.通过3DFDTD方法计算出在平板厚度为300nm时,谐振波长随a和r/a变化的规律,即当给定r/a,h时,波长随晶格常数成次线性增加;当给定a,h时,波长随r/a的增加而减小.并从理论上给予分析.
The principle of the enhancement of nc-Ge/Si islands by a photonic crystal single-defect cavity is explained. For a photonic crystal slab with a thickness of 300nm,the resonant wavelength of a photonic crystal single-defect cavity based on Ge/Si islands as a function of a and r/a is calculated with the 3D FDTD method and is analyzed theoretically. For fixed r/a and h ,the wavelength increases sub-linearly with the increase of lattice constant. For fixed a and h ,the wavelength decreases linearly with the increase of r/a.