应用不对称一维光子晶体结构制备窄光谱LED

对周期性的GaAlAs／AlAs模块堆积组成的有缺陷的一维光子晶体的光波传输模式进行了理论与实验研究。由于堆积结构的周期性受到破坏，导致了光子晶体中模密度发生变化，光波的传播也发生了变化。对模密度和光的传播模式分别用流行的光子能态理论和光学传输矩阵进行了计算和模拟。计算发现采用不对称结构的一维光子晶体结构在实际应用中有更大的灵活性。用金属有机物化学汽相沉积方法实现一维光子晶体，并用于裁剪普通的发光二极管电致发光谱，在20mA的激发电流下，半峰全宽为2．8mm，单色性优 于共振腔发光二极管。在较大的激发电流下，带边发射的增强现象也被观测到。

The Fabrication of Narrow Spectrum LED by Employing Asymmetry One-Dimensional Photonic Crystal

The transmission of light waves through a perturbed one-dimensional (1D) photonic band gap structures (PBGS) which was constructed by stacking a number of GaAlAs/AlAs unit cells, has been investigated. Because of the interruption to the stack periodicity of the unit cells, the electromagnetic density of modes (DOM) of the photonic crystals was changed, so that the transmission of the light waves changed. And the DOM and the transmission mode were calculated and simulated by the popular density calculation method and the characteristic matrix. It is found that the asymmetric structures are more profitable compared with symmetric structure in applications. The asymmetric 1D PBGS was realized by the MOCVD method. The full width at half maximum (FWHM) narrowed to 3.1 nm, inspired at 20 mA, which is better than RCLED. And the edge emission was also observed.