共查询到19条相似文献,搜索用时 156 毫秒
1.
基于溶胶凝胶ZrO2薄膜的紫外/可见/近红外透射实验光谱,采用Swanepoel方法结合Wemple-DiDomenico色散模型,方便地导出了ZrO2薄膜在200—1200nm波长范围内的光学常数,包括折射率、色散常数、膜层厚度、吸收系数及能量带隙.研究发现,溶胶凝胶ZrO2薄膜具有高折射率(1.63—1.93,测试波长为632.8nm)、低吸收和直接能量带隙(4.97—5.63eV) 等光学特性,而且其光学常数对薄膜制备过程中的重要工艺
关键词:
光学常数
Swanepoel方法
2薄膜')" href="#">ZrO2薄膜
热处理 相似文献
2.
基于溶胶凝胶ZrO2薄膜的紫外/可见/近红外透射实验光谱,采用Swanepoel方法结合Wemple-DiDomenico色散模型,方便地导出了ZrO2薄膜在200-1200 nm波长范围内的光学常数,包括折射率、色散常数、膜层厚度、吸收系数及能量带隙.研究发现,溶胶凝胶ZrO2薄膜具有高折射率(1.63-1.93,测试波长为632.8 nm)、低吸收和直接能量带隙(4.97-5.63 eV) 等光学特性,而且其光学常数对薄膜制备过程中的重要工艺参数--膜层后处理温度表现出强烈的依赖性.此外,在膜层的弱吸收和中等吸收光谱区域内,计算得到的折射率色散曲线与分光光度法的测试结果基本符合,说明本实验中所建立的计算方法在确定溶胶凝胶ZrO2薄膜光学常数方面的可靠性. 相似文献
3.
采用磁控溅射法制备了Ge20Sb15Se65薄膜, 研究热处理温度(150—400 ℃)对薄膜光学特性的影响. 通过分光光度计、X射线衍射仪、显微拉曼光谱仪对热处理前后薄膜样品 的光学特性和微观结构进行了表征, 并根据Swanepoel方法以及Tauc公式分别计算了薄膜折射率色散曲线和光学带隙等参数. 结果表明当退火温度(Ta)小于薄膜的玻璃转化温度(Tg)时,薄膜的光学带隙(Egopt)随着退火温度的增加由1.845 eV上升至1.932 eV, 而折射率由2.61降至2.54; 当退火温度大于薄膜的玻璃转化温度时,薄膜的光学带隙随退火温度的增加由1.932 eV降至1.822 eV, 折射率则由2.54增至2.71. 最后利用Mott和Davis提出的非晶材料由非晶到晶态的结构转变模型对结果进行了解释, 并通过薄膜XRD和Raman光谱进一步验证了结构变化是薄膜热致变化的重要原因.
关键词:
20Sb15Se65薄膜')" href="#">Ge20Sb15Se65薄膜
热处理
光学带隙
折射率 相似文献
4.
采用中频磁控溅射法制备了镱铒共掺Al2O3薄膜,铒镱掺杂浓度分别为0.3%,3.6%(摩尔分数,全文同).讨论了三价铒离子529nm和549nm光致发光的上转换机理.在291.8—573.3K温度区间测量了两绿上转换光谱荧光强度比的温度特性,拟合表达式为R=5.37exp(-738/T).366 K温度时灵敏度最大,为0.0039 K-1.结果表明镱铒共掺Al2O3薄膜适合作为小型、高温和高灵敏的光学温度传感材料.
关键词:
2O3薄膜')" href="#">镱铒共掺Al2O3薄膜
中频磁控溅射
上转换
荧光强度比 相似文献
5.
设计并镀制了193nm Al2O3/MgF2反射膜,对它们在空气中分别进行了250—400℃的高温退火,测量了样品的透射率光谱曲线和绝对反射率光谱曲线.发现样品在高反射区的总的光学损耗随退火温度的升高而下降,而后趋于饱和.采用总积分散射的方法对样品在不同退火温度下的散射损耗进行了分析,发现随着退火温度的升高散射损耗有所增加.因此,总的光学损耗的下降是由于吸收损耗而不是散射损耗起主导作用.对Al2O3材料的单层膜进行了同等条件的退火处理,由它们光学性能的变化推导出它们的折射率和消光系数的变化,从而解释了相应的多层膜光学性能变化的原因.反射膜的反射率在优化联系、镀膜工艺与退火工艺的基础上达98%以上.
关键词:
193nm 反射膜
退火
光学损耗
吸收 相似文献
6.
采用多靶磁控溅射法制备了一系列具有不同Al2O3调制层厚度的TiN/Al2O3纳米多层膜. 利用X射线能量色散谱、X射线衍射、扫描电子显微镜、高分辨透射电子显微镜和微力学探针表征了多层膜的成分、微结构和力学性能. 研究结果表明,在TiN/Al2O3纳米多层膜中,单层膜时以非晶态存在的Al2O3层在厚度小于1.5 nm时因TiN晶体层的模板效应而晶化,并与TiN层形成共格外延生长,相应地,多层膜产生硬度明显升高的超硬效应,最高硬度可达37.9 GPa. 进一步增加多层膜中Al2O3调制层的层厚度,Al2O3层逐渐形成非晶结构并破坏了多层膜的共格外延生长,使得多层膜的硬度逐步降低.
关键词:
2O3纳米多层膜')" href="#">TiN/Al2O3纳米多层膜
外延生长
非晶晶化
超硬效应 相似文献
7.
采用溶胶-凝胶方法制备了ZrO2-TiO2(Ti含量为0—100mol%)高折射率光学薄膜. 借助激光动态光散射技术研究溶胶微结构. 采用傅里叶变换红外光谱、原子力显微镜、薄膜光学常数分析仪、漫反射吸收光谱及强激光辐照实验,对膜层的结构、光学性能及抗激光损伤性能进行了系统表征. 结果显示,溶胶-凝胶工艺可以在部分牺牲折射率的情况下,使膜层的抗激光损伤性能得到大幅度提升. 随Ti含量从0mol%增加至100mol%,膜层的平均损伤阈值呈下降趋势,当Ti含量从0mol%增加至60mol%时,平均损伤阈值从57.1J/cm2下降到21.1J/cm2(辐照激光波长为1053nm,脉冲宽度为10ns,“R/1”测试模式),当Ti含量从60mol%增加至100mol%时,平均损伤阈值变化很小. 综合溶胶微结构、膜层光学性能和损伤实验结果可以推断,强激光诱导多光子吸收是引起膜层损伤的主要原因. 不同配比的复合膜之间光学带隙的显著差异导致相同辐照激光情况下多光子吸收的概率发生变化,从而导致损伤阈值的规律性变化.
关键词:
2-TiO2薄膜')" href="#">ZrO2-TiO2薄膜
溶胶-凝胶
激光诱导损伤
光学带隙 相似文献
8.
9.
研究了离子束溅射(IBS)制备的Nb2O5薄膜的光学特性、应力、薄膜微结构等特性,系统地分析了辅助离子源的离子束能量和离子束流对薄膜特性的影响.结果显示,在辅助离子源不同参数情况下,折射率在波长550 nm处为2.310—2.276,应力值为-281—-152 MPa.在合适的工艺参数下,消光系数可小于10-4,薄膜具有很好的表面平整度.与用离子辅助沉积(IAD)制备的薄膜相比,IBS制备的薄膜具有更好的光学特性和薄膜微结构.
关键词:
2O5薄膜')" href="#">Nb2O5薄膜
离子束溅射
光学特性
应力 相似文献
10.
用传统熔融法制备了一种新型的氧氯碲酸盐玻璃:(90-x)TeO2-10Nb2O5-xBaCl2(x=10,20,30),用密度比重天平、显微拉曼光谱仪、红外-可见-紫外分光光度计和棱镜耦合仪研究了组分变化对玻璃密度、结构、光学性质、折射率和色散的影响.研究结果表明:随玻璃中BaCl2含量增加,玻璃密度出现了先增大后减小的现象;玻璃结构中双三角锥体[TeO4]量减少,三角棱锥体[TeO3]量增加;玻璃的折射率逐渐减小.新型的氧氯碲酸盐玻璃具有较高的线性折射率nmax=2.02259,非线性折射率N2=6.8×10-12esu与三阶非线性极化率χ(3)=3.7×10-13esu.制备的新型碲酸盐玻璃在可见和中红外光谱区具有高透过,在近紫外光谱区具有明显的吸收截止波长,且随BaCl2含量增加吸收截止波长发生了明显的蓝移现象.利用经典的Tauc方程计算了玻璃样品的直接跃迁光学带隙和间接跃迁光学带隙,玻璃的光学带隙随BaCl2含量增加而增大. 相似文献
11.
Z.M. Elimat 《辐射效应与固体损伤》2013,168(8):686-695
The optical characterization of poly (ethylene oxide)/zinc oxide thin films has been done by analyzing the absorption spectra in the spectral wavelength region 380–800 nm using a ultraviolet-spectrophotometer at room temperature. Thin film polymer composites made of poly (ethylene oxide) (PEO) containing zinc oxide (ZnO) filler concentrations (0%, 2%, 6%, 10%, and 14%) by weight were used in this study. The optical results obtained were analyzed in terms of the absorption formula for non-crystalline materials. The optical energy gap and other basic optical constants such as dielectric constants and optical conductivity were investigated and showed a clear dependence on the ZnO filler concentration. It was found that the optical energy gap for the composite films is less than that for the neat PEO, and that it decreases as the ZnO concentration increases. Enhancement of the optical conductivity was observed with increase in the ZnO concentration. Dispersion of refractive index was analyzed using the Wemple–DiDomenico single oscillator model. The refractive index (n), extinction coefficient (k), and dispersion parameters (Eo, Ed) were calculated for the investigated films. 相似文献
12.
S.H. Mohamed André Anders L. Galán 《Journal of Physics and Chemistry of Solids》2007,68(12):2227-2232
Thin films of tungsten oxynitrides were deposited on substrates preheated at 300 °C from metallic tungsten target using reactive pulsed d.c. magnetron sputtering. The deposition was carried out at different nitrogen to total reactive gas partial pressures ratios. The energy dispersive analysis of X-ray showed that significant incorporation of nitrogen occurred only when the nitrogen partial pressure exceeded 74% of the total reactive gas pressure. X-ray diffraction analysis revealed that the formation of a specific crystalline phase is affected by the composition and the possibility of competitive growth of different phases. The increase of nitrogen content into the films increases the optical absorption and decreases the optical band gap. The refractive index was determined from the transmittance spectra using Swanepoel's method. It was found that the refractive index increases with increasing nitrogen content over the entire spectral range. The values of the tungsten effective coordination number, Nc, was estimated from the analysis of the dispersion of the refractive index, and an increase in Nc with increasing nitrogen content was observed. 相似文献
13.
Size dependence of non-linear optical properties of SiO2 thin films containing InP nanocrystals 总被引:1,自引:0,他引:1
M.J. Zheng L.D. Zhang J.G. Zhang 《Applied Physics A: Materials Science & Processing》2001,73(2):183-187
SiO2 composite thin films containing InP nanocrystals were fabricated by radio-frequency magnetron co-sputtering technique. The
microstructure of the composite thin films was characterized by X-ray diffraction and Raman spectrum. The optical absorption
band edges exhibit marked blueshift with respect to bulk InP due to strong quantum confinement effect. Non-linear optical
absorption and non-linear optical refraction were studied by a Z-scan technique using a single Gaussian beam of a He-Ne laser
(632.8 nm). We observed the saturation absorption and two-photon absorption in the composite films. An enhanced third-order
non-linear optical absorption coefficient and non-linear optical refractive index were achieved in the composite films. The
nonlinear optical properties of the films display the dependence on InP nanocrystals size.
Received: 27 June 2000 / Accepted: 27 June 2000 / Published online: 13 September 2000 相似文献
14.
Vali Dalouji 《Optical and Quantum Electronics》2018,50(8):325
The aim of this work is to investigate the optical constants of aluminum doped zinc oxide films annealed at different temperatures. With increasing temperature, due to decreasing unfilled inter-granular volume per unit thickness, the optical transmittance spectra of films were increased. The films have a normal dispersion in the spectral range 400?<?λ?<?500 nm and the anomalous dispersion in IR range. The lattice dielectric constants εL, the free charge carriers concentration, the plasma frequency, Spitzer–Fan model and the waste of electrical energy as heat of films can be analyzed using the refractive index n and the extinction coefficient k spectra. With increasing annealing temperature, the lattice dielectric constants εL of films decrease however the free charge carriers concentration of films increase. The free carrier electric susceptibility of films annealed at 600 °C has maximum value. The energy loss by the free charge carriers when traversing the bulk and surface of films annealed at 600 °C has a minimum value in the near fundamental absorption edge and it with increasing energy increases. 相似文献
15.
We have studied formation of Au-Ag alloy nanoparticles in sputtered SiO2 thin films. Silica thin films containing Au-Ag nanoparticles were deposited on quartz substrates using rf reactive magnetron co-sputtering technique. The films heat-treated in reducing Ar + H2 atmosphere at different temperatures. They were analyzed by using UV-vis spectrophotometry, atomic force microscopy and X-ray photoelectron spectroscopy (XPS) methods for their optical, surface morphological as well as structural and chemical properties. The optical absorption of the Au-Ag alloy nanoparticles illustrated one plasmon resonance absorption peak located at 450 nm between the absorption bands of pure Au and Ag nanoparticles at 400 and 520 nm, respectively, for the thin films annealed at 800 °C. XPS results showed that the alloys were in metallic state, and they had a greater tendency to lose electrons as compared to their corresponding monometallic state. Using lateral force microscopy analysis, we have found that the alloy particles were uniformly distributed on the surface with grain size of about 20 nm. 相似文献
16.
A. Ya. Khairullina I. N. Parkhomenko O. N. Kudanovich D. S. Filimonenko 《Optics and Spectroscopy》2012,112(5):713-719
We have studied nanostructural and optical properties of composites of nanostructured nickel oxide films on a substrate from porous aluminum oxide NiO/Al2O3 in the UV, visible, and IR spectral ranges on exposure of composites to different gases, vacuum, and heat. We have found that, upon irradiation of NiO/Al2O3 composites by laser radiation at a wavelength of 633 nm, they demonstrate a high sensitivity to carbon monoxide CO in the range of the excitonic absorption of nickel oxide. We assume that an increase in the transmission coefficient of the composite in the excitonic absorption band is determined by luminescence that is caused by the oxidation reaction of carbon monoxide. The sensitivity of composites to CO is enhanced with decreasing the size of NiO nanoparticles and after evacuation. The values of the diffuse reflection coefficient at the laser radiation wavelength of 633 nm correlate with the size of nickel oxide nanoparticles. Spectral changes in the range of the fundamental absorption band of NiO that occur in the IR range and in diffuse reflection spectra are related to the appearance of carbon-containing compounds in the composite exposed to CO. 相似文献
17.
E. Márquez J.M. González-Leal R. Prieto-Alcón M. Vlcek A. Stronski T. Wagner D. Minkov 《Applied Physics A: Materials Science & Processing》1998,67(3):371-378
40 S40Se20, deposited by thermal evaporation, were obtained in the 400 nm to 2200 nm spectral region. The optical constants of this
amorphous material were computed using an optical characterization method based mainly on the ideas of Minkov and Swanepoel
of utilising the upper and lower envelopes of the spectrum, which allows us to obtain both the real and imaginary parts of
the complex refractive index, and the film thickness. Thickness measurements made by a surface-profiling stylus have been
carried out to cross-check the results obtained by the optical method. The dispersion of the refractive index is discussed
in terms of the single-oscillator Wemple–DiDomenico model. The optical band gap has been determined from absorption coefficient
data by Tauc’s procedure. Finally, the photo-induced and thermally induced changes in the optical properties of a-As40S40Se20 thin films were also studied, using both transmission and reflection spectra.
Received: 11 February 1998/Accepted: 16 February 1998 相似文献
18.
M. M. El-Nahass A. M. Hassanien Ahmed Ashour A. Alhuthali Sultan E. Alomariy Ateyyah M. Al-Baradi A. A. Atta 《Optical and Quantum Electronics》2018,50(8):313
The structural and optical properties of RF sputtered Nb2O5 thin films are studied before and after gamma irradiation. The films are subjected to structural and surface morphological analyses by using X-ray (XRD) and field emission scanning electron microscope techniques. In the wavelength range of 300–2000 nm, the optical parameters for amorphous and crystalline Nb2O5 thin films are estimated at differently exposed γ-irradiation doses (0, 50, 100 and 200 kGy). The optical constants, such as optical energy band gap, absorption coefficient, refractive index and oscillators parameters of amorphous and crystalline Nb2O5 thin films are calculated. The optical band gaps of γ-irradiated amorphous and crystalline Nb2O5 thin films are determined. In the non-absorbing region, the real part of the refractive index of amorphous and crystalline Nb2O5 thin films slightly increases with the increase in the exposed γ-irradiation dose. 相似文献
19.
A. A. Goncharov A. V. Demchishin A. A. Demchishin E. G. Kostin V. A. Michenko B. V. Stetsenko E. G. Ternovoĭ A. I. Shchurenko 《Technical Physics》2007,52(8):1073-1078
The characteristics of a cylindrical magnetron, such as the dependences of the discharge voltage, chamber pressure, and plasma radiation intensity on the reactive gas flow rate and discharge current, are studied. In this magnetron, titanium nitride (TiN) and titanium dioxide (TiO2) films are obtained by reactive magnetron sputtering. The transmission and reflection spectra of the films in the visual range are taken. From the transmission data for the TiO2 films, their refractive index and absorption factor in the wavelength range 350–800 nm, as well as the porosity, are found by the Valeev method. The variation of the fundamental absorption edge with film thickness is determined with the Urbach formula. 相似文献