论文标题
Na掺杂对ZnO纳米结构的非线性t光学特征的光致发光和激光的影响
Effect of Na doping on photoluminescence and laser stimulated nonlinear T optical features of ZnO nanostructures
论文作者
论文摘要
在这项工作中，已经对Na：ZnO薄膜（NA：ZnO）的非线性光学性质进行了实验阐述。显示了使用外部激光束操作非线性光学特征的主要可能性。 Na：ZnO膜是通过喷雾热解技术在等于约400 C的沉积温度下合成的。XRD图显示，生长的膜本质上是多晶的多晶层，其主要峰值对应于（0 0 2）平面。尽管Na和Zn的离子半径差异，但未观察到XRD峰的角度移动，而峰强度发生了显着变化。光致发光（PL）光谱导致三个发射中心在紫罗兰色，蓝色和绿色区域中，由于禁止能量隙中存在天然缺陷状态，因此位于紫色，蓝色和绿色区域。由外部相干光束刺激的第二和第三次谐波生成（SHG，THG）显示出15％Na掺杂的Zn：O的最大值的存在，对于纯ZnO而言，对于SHG的最大值截然不同。这项工作的主要创新是可以改变非线性光敏感性改变Na掺杂浓度和连贯的激光处理，这与以前未探索这些参数的工作相反。
In this work, nonlinear optical properties of Na: ZnO thin films (Na: ZnO) have been experimentally elaborated. The principal possibility to operate the nonlinear optical features using external laser beams is shown. The Na: ZnO films were synthesized by spray pyrolysis technique at a deposition temperature equal to about 400 C. XRD graph reveals that the grown films were polycrystalline in nature with a dominant peak corresponding to (0 0 2) plane. Despite the difference in the ionic radii of the Na and Zn, an angle shift in the XRD peak was not observed, whereas there was a significant change in peak intensity. The photoluminescence (PL) spectra resulted in three emission centres spectrally situated in violet, blue and green colour region due to the presence of native defect states in the forbidden energy gap. Second and third harmonic generation (SHG, THG) ex-periments stimulated by external coherent light beams show the existence of THG maxima for 15% Na doped Zn:O which was quite different with respect to SHG maximum for pure ZnO. The main innovation of this work is the possibility to change nonlinear optical susceptibility varying Na doping concentration and by coherent laser treatment, contrary to the previous works where these parameters have not been explored.
