In this study, Cu 2 ZnSnS 4 nanocrystal and its constituents’ copper, zinc and tin were grown separately by pulsed laser deposition technique as thin films, and their linear and nonlinear optical properties have been investigated. Linear optical properties were analysed with UV–Vis absorption spectra. Elemental composition of Cu 2 ZnSnS 4 thin films was analysed by scanning electron microscope–energy dispersive X-ray. The nonlinear optical properties for Cu 2 ZnSnS 4 nanocrystal and its constituents’ copper, zinc and tin have been determined applying z-scan method with closed and open aperture measurements using femtosecond laser (90 fs) pulses which deliver fundamental wavelength at 800 nm. Furthermore, Cu 2 ZnSnS 4 nanocrystal ultrathin films and copper, zinc and tin thin films nonlinear refractive indexes n 2 were calculated about ~ 10 −13 cm 2 /W, their nonlinear absorption coefficient β are calculated about ~ 10 −12 cm/W. Third-order susceptibilities for nano-crystal ultra-thin films and copper, zinc, and tin thin films were determined to be 10 −11 esu.

中文翻译：

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Cu2ZnSnS4纳米晶薄膜及其成分薄膜的非线性光学特性

在这项研究中，Cu 2 ZnSnS 4 纳米晶体及其成分的铜、锌和锡分别通过脉冲激光沉积技术生长为薄膜，并研究了它们的线性和非线性光学特性。用紫外-可见吸收光谱分析线性光学特性。Cu 2 ZnSnS 4 薄膜的元素组成通过扫描电子显微镜-能量色散X射线分析。Cu 2 ZnSnS 4 纳米晶体及其成分的铜、锌和锡的非线性光学特性已通过使用飞秒激光 (90 fs) 脉冲的闭孔和开孔测量的 z 扫描方法确定，该脉冲提供 800 nm 的基本波长。此外，Cu 2 ZnSnS 4 纳米晶超薄膜和铜，锌和锡薄膜的非线性折射率n 2 计算为大约～10 -13 cm 2 /W，它们的非线性吸收系数β计算为大约～10 -12 cm/W。纳米晶体超薄膜和铜、锌和锡薄膜的三阶磁化率被确定为10 -11 esu。