论文标题
喷雾型MG中的第二和第三谐波非线性光学过程：ZnO薄膜
Second and third harmonic nonlinear optical process in spray pyrolysed Mg:ZnO thin films
论文作者
论文摘要
在本研究中，通过喷雾热解技术生长了MG掺杂的ZnO（MZO）纳米膜（NF）。 X射线衍射（XRD）模式已显示出沿（002）结晶平面的强烈峰，确认了成长的MZO膜的结晶起源。原子力显微镜（AFM）数据表明，Mg掺杂从20.3 nm到4.72 nm时，平均粗糙度显着降低。由于膜中存在各种固有缺陷中心，环境温度光致发光光谱在可见光谱区域占了四个发射带。通过开放的孔径z扫描技术估算了非线性吸收系数beta_eff，发现以10-2（cm/w）为单位，并表明吸收非线性阳性。此外，观察到金属Mg离子的掺入会导致第二次谐波产生（SHG）的衰减，并导致第三次谐波产生（THG）的不规则增加。
In the present study, Mg-doped ZnO (MZO) nanofilms (NF) were grown by spray pyrolysis technique. X-ray diffraction (XRD) patterns have shown an intense peak oriented along (002) crystalline plane confirming crystalline origin of grown MZO films. Atomic force microscopy (AFM) data revealed that the average roughness decreased significantly upon Mg doping from 20.3 nm to 4.72 nm. Ambient temperature photoluminescence spectra accounted for four emission bands in the visible spectral region due to the presence of various intrinsic defect centres in the films. The non-linear absorption coefficient beta_eff were estimated by open aperture Z-scan technique and found to be in the order of 10-2 (cm/W) and indicates a positive absorption nonlinearity. Additionally, it was observed that incorporation of the metal Mg ions leads to a decay of the second harmonic generation (SHG) and to a non-regular increase of the third harmonic generation (THG).
