Optical, structural and Near-IR NLO properties of gold nanoparticles doped sodium zinc borate glasses
Optical, structural and Near-IR NLO properties of gold nanoparticles doped sodium zinc borate glasses
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DOI：
10.1016/j.optmat.2018.05.083
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发表时间：
2018-09-01
影响因子：
3.9
通讯作者：
Rao, S. Venugopal
中科院分区：
文献类型：
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作者：
Kolavekar, Sangeeta B.;Ayachit, N. H.;Rao, S. Venugopal
采用熔体淬冷技术制备了（x-0.1）Na 2 O-10 ZnO-（90-x）B2 O3 -0.1AuCl（3）（x = 10，20，30 mol %）嵌金（Au）纳米颗粒（NP）硼酸盐玻璃。采用紫外-可见吸收光谱、傅里叶变换红外光谱、高分辨透射电子显微镜和Z扫描等测试手段，研究了Na 2 O含量对含金纳米粒子的钠锌硼酸盐玻璃的光学、结构和非线性光学（NLO）性质的影响。X射线衍射（XRD）测量证实了样品的玻璃态性质。包含Au NPs的玻璃的紫外-可见吸收光谱显示，由于从d带到费米能级的跃迁，在577 nm附近出现了宽的表面等离子体共振（SPR）吸收峰，并且该SPR峰随着Na 2 O浓度的增加而红移。HR-TEM显微照片显示存在均匀分布的球形Au纳米颗粒，其估计的平均粒度类似于6 nm（+/-1.5 nm）。在三个不同的非共振波长（750 nm、800 nm、850 nm）下使用由aTi：蓝宝石振荡器递送的飞秒（fs）脉冲（150 fs，80 MHz）进行非线性光学（NLO）测量。在开孔（OA）Z-扫描数据中观察到饱和吸收（SA）类型的非线性，并且归因于Au NPs内的带内跃迁，而闭孔（CA）Z-扫描数据说明归因于自散焦效应的负类型的非线性折射。非线性光学研究和获得的非线性系数表明，NZB玻璃是近红外锁模和开关应用的潜在候选者。
Gold (Au) nanoparticles (NP) embedded borate glasses with the molar composition of (x-0.1) Na2O-10ZnO-(90-x)B2O3-0.1AuCl(3) (x = 10, 20, 30 mol %) have been prepared via melt quench technique. The effect of Na2O content on properties such as optical, structural and nonlinear optical (NLO) properties of gold NPs containing sodium zinc borate glasses were studied using UV-Visible absorption, Fourier Transform Infrared spectroscopy (FTIR), High Resolution-Transmission Electron Microscope (HR-TEM) and Z-scan measurements. X-ray diffraction (XRD) measurements confirmed the glassy nature of the samples. UV-Visible absorption spectra of glasses comprising Au NPs demonstrated a broad surface plasmon resonance (SPR) absorption peak near 577 nm due to the transition from d-band to the Fermi level and this SPR peak demonstrated a red-shift with increase in Na2O concentration. HR-TEM micrographs revealed the presence of uniformly distributed and spherical shaped Au nanoparticles with an estimated average particle size of similar to 6 nm (+/- 1.5 nm). Nonlinear Optical (NLO) measurements were performed at three different off resonant wavelengths (750 nm, 800 nm, 850 nm) using femtosecond (fs) pulses (150 fs, 80 MHz) delivered by aTi:sapphire oscillator. Saturable Absorption (SA) kind of nonlinearity has been observed in the open aperture (OA) Z-scan data and is attributed to intraband transition within the Au NPs, while the closed aperture (CA) Z-scan data illustrated a negative type of nonlinear refraction attributed to effect of self-defocusing. NLO studies and the obtained nonlinear coefficients suggest that, the NZB glasses are potential candidates for mode-locking and switching applications in near-infrared spectral region.