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首页> 外文期刊>Applied Surface Science >Thickness-dependent microwave dielectric and nonlinear optical properties of Bi_(0.5)Na_(0.5)TiO_3 thin films
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Thickness-dependent microwave dielectric and nonlinear optical properties of Bi_(0.5)Na_(0.5)TiO_3 thin films

机译：Bi_（0.5）Na_（0.5）TiO_3薄膜的厚度依赖性微波介电常数和非线性光学性质

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摘要

Lead-free Bi0.5Na0.5TiO3 (BNT) films were grown on Pt(111)/Ti/SiO2/Si and quartz substrates for various thickness by using pulsed laser deposition technique. The impact of thickness on structural, microstructural, Raman-spectroscopy, microwave dielectric and nonlinear optical properties have been investigated in detail. X-ray diffraction pattern of BNT films deposited at 700 degrees C showed rhombohedral crystal symmetry with a small secondary phase of Bi4Ti3O12 and also revealed that the lattice parameters, lattice volume, strain and crystallite size were enhanced with film thickness. The film thickness, refractive index and optical bandgap have been determined by Swanepoel's envelope method and Tauc relation and are in the range of 208 nm-1300 nm, 3.79 eV-3.28 eV and 2.41-1.80, respectively. The third order nonlinear optical properties of films were estimated by Z-scan technique and the 208 nm film exhibited strong nonlinear refractive index (n(2) = 4.62 x 10(-6) cm(2)/W) and nonlinear absorption coefficient (beta = 0.796 cm/W). The enhancement in microwave dielectric properties was observed with film thicknesses which were measured by using SPDR technique. The leakage current density exhibited the space charge limited current conduction behavior. The enhanced microwave dielectric and nonlinear optical properties of BNT films are promising for microwave tunable and nonlinear photonic device applications.
机译：通过使用脉冲激光沉积技术，在Pt（111）/ Ti / SiO2 / Si和石英衬底上生长了无铅的Bi0.5Na0.5TiO3（BNT）膜，使其具有各种厚度。厚度对结构，微结构，拉曼光谱，微波介电和非线性光学性质的影响已得到详细研究。在700℃沉积的BNT薄膜的X射线衍射图显示出菱形的晶体对称性，Bi4Ti3O12的次级相较小，并且晶格参数，晶格体积，应变和微晶尺寸随膜厚的增加而增强。膜厚度，折射率和光学带隙已通过Swanepoel的包络法和Tauc关系确定，分别在208 nm-1300 nm，3.79 eV-3.28 eV和2.41-1.80范围内。通过Z扫描技术估算了薄膜的三阶非线性光学特性，并且208 nm薄膜表现出很强的非线性折射率（n（2）= 4.62 x 10（-6）cm（2）/ W）和非线性吸收系数（ β= 0.796 cm / W）。通过使用SPDR技术测量的膜厚度观察到微波介电性能的增强。泄漏电流密度表现出空间电荷受限的电流传导行为。 BNT膜的增强的微波介电和非线性光学特性有望在微波可调谐和非线性光子器件应用中得到应用。

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