【摘要】 采用脉冲激光沉积(PLD)技术在MgO基片上制备了金属Fe薄膜.利用原子力显微镜研究了不同制备温度对薄膜表面形貌的影响.x射线衍射分析表明沉积温度大于500℃时,Fe薄膜在MgO基片上有很好的结晶性,并有单一取向.通过z扫描方法测量了超薄Fe膜的光学非线性,得到了Fe薄膜的非线性折射率n2=7.09×10-5cm2kW,非线性吸收系数β=-5.52×10-3cm W.更多还原

【Abstract】 Thin films of iron were fabricated on MgO(100) substrates using pulsed laser deposition technique. The crystalline property and surface roughness of the films were investigated by x ray diffraction and atomic force microscopy, respectively. It is found that the Fe films deposited at 500 and 800℃ are of single phase, and no diffraction from randomly oriented grains or impurity phases can be observed. The nonlinear optical properties of continuous 9 nm thick iron film were determined using the z scan method. The results show that the ultra thin iron film exhibits large nonlinear refractive coefficient, n 2= 7 09×10 -5 cm 2/kW, and nonlinear absorption coefficient, β =-5 52×10 -3 (cm/W), at the wavelength of 532 nm.更多还原