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1.
磁控溅射不同厚度银膜的微结构及其光学常数   总被引:5,自引:0,他引:5       下载免费PDF全文
用直流溅射法在室温K9玻璃基底上制备了8.2nm—107.2nm范围内不同厚度的Ag薄膜,并用X射线衍射及计算机辅助优化程序对薄膜的微结构和光学常数进行了测试分析. 结构分析表明:制备的Ag薄膜均呈多晶状态,晶体结构均呈面心立方;随着膜厚的增加,薄膜的平均晶粒尺寸逐渐增大,晶面间距逐渐减小. 计算机辅助优化编程计算的薄膜光学常数分析表明:在波长550nm处,当膜厚小于17.5nm时,随着膜厚的增加,折射率n快速减小,消光系数k则快速增大;当膜厚大于17.5nm时,n和k逐渐趋于稳定. 关键词: 直流溅射镀膜 银膜 微结构 光学常数  相似文献   

2.
从麦克斯韦方程出发,可以得到超薄金属膜层光学常数n、k与其厚度有关系的理论依据。采用电阻热蒸发和电子束热蒸发的方法在K9玻璃基底上分别沉积了不同厚度的Cu膜、Cr膜、Ag膜,由椭偏法检测、Drude模型拟合,获得了不同厚度Cu膜、Cr膜、Ag膜光学常数n、k随波长λ的变化规律。超薄金属薄膜与块状金属的光学常数相差较大,随着薄膜厚度的增加,n、k值趋近于块状金属。通过对样品膜层吸收、色散特性的分析,发现连续金属薄膜在可见光波段对长波的吸收较大,而且相比于介质薄膜平均色散率高10mn~102nm量级。  相似文献   

3.
逯鑫淼  姜来新  吴谊群  王阳 《光学学报》2012,32(11):1131001
采用磁控溅射法制备了不同厚度的锑基铋掺杂薄膜,用X射线衍射(XRD)和透射电子显微镜(TEM)研究了薄膜结构随厚度的变化。利用椭圆偏振法测定了样品薄膜在近红外波段的光学常数与光学带隙,研究了膜厚对样品薄膜光学常数和光学带隙的影响。结果表明,膜厚从7 nm增加至100 nm时,其结构由非晶态转变为晶态。在950~2200 nm波段,不同厚度薄膜样品的折射率在4.6~8.9范围,消光系数在0.6~5.8范围,光学带隙在0.32~0.16 eV范围。随着膜厚的增加,薄膜的折射率和光学带隙减小,而消光系数升高;光学常数在膜厚50 nm时存在临界值,其原因是临界值前后薄膜微观结构变化不同。  相似文献   

4.
牛江伟  潘永强 《应用光学》2018,39(6):867-872
极薄银在滤光片、高反射镜等中有广泛的应用,其光学常数严重影响着膜系的特性。在室温条件下,采用电阻热蒸发技术分别在硅和玻璃基底上沉积5.3 nm~26 nm不同厚度的极薄银薄膜,用TalySurfCCI非接触式轮廓仪测量了薄膜的厚度,研究了不同厚度银薄膜的光学常数n和k。镀制厚度5.3 nm、7.9 nm、14.1 nm、26.0 nm的银薄膜,结果显示极薄银的光学常数与块状银光学常数不同,当膜厚小于14.1 nm时,折射率n在380 nm~600 nm随波长增加而增加,在600 nm~1 600 nm随波长增加缓慢减小至趋于稳定值2.6;消光系数k在380 nm~500 nm随着波长增加而增加,在500 nm~1 600 nm随波长增加而缓慢减小至趋于0不变;当膜厚大于14.1 nm时,折射率随波长增加而增加,消光系数随波长近似呈线性增加。整体上,膜厚增加时折射率减小且趋于块状银的折射率,k随厚度增加而增加并最终趋于块状膜。用此拟合的光学常数代入TFc膜系设计软件计算其透射率,发现与分光光度计测得的透射率吻合较好。  相似文献   

5.
Hf O_2薄膜厚度达到纳米级别时,其光学性质会发生变化。光谱椭偏仪能够同时得到纳米尺度薄膜的厚度和光学常数,但是由于测量参数的关联性,光学常数的结果不准确可靠。本文采用溯源至SI单位的掠入射X射线反射技术对纳米尺度Hf O_2薄膜厚度进行准确测量,再以该量值为准确薄膜厚度参考值。利用光谱椭偏仪测量Hf O_2膜厚和光学常数时,参考膜厚量值,从而得到对应相关膜厚的薄膜准确光学参数。研究了以Al2O_3作为薄膜缓冲层的名义值厚度分别为2,5,10 nm的超薄Hf O_2薄膜厚度对光学性质的影响。实验结果表明,随着Hf O_2薄膜厚度的增加,折射率也逐渐增大,在激光波长632.8 nm下其折射率分别为1.901,2.042,2.121,并且接近于体材料,而消光系数始终为0,表明纳米尺度Hf O_2薄膜在较宽的光谱范围内具有较好的增透作用,对光没有吸收。  相似文献   

6.
室温下采用射频磁控溅射氧化锌(ZnO)粉末靶、银(Ag)靶,在玻璃衬底上制备ZnO/Ag/ZnO透明导电薄膜。首先,ZnO厚度为30 nm时,改变Ag厚度制备3层透明导电薄膜,研究Ag层厚度及膜层间配比对光电性能的影响;其次,按ZnO∶Ag厚度比为30∶11比例制备不同厚度的3层透明导电薄膜,研究多层厚度对薄膜光电性能的影响。结果表明:Ag厚度为8 nm及11 nm的ZnO/Ag/ZnO表面相对平整,结晶程度较好,在可见光范围内最高透过率达到90%及86%,并且方块电阻为6 Ω/□及3.20 Ω/□,具有优良的光电性;当按配比制备ZnO/Ag/ZnO 3层膜时,增加ZnO厚度对Ag层的增透作用反而减弱,同时增加Ag层厚度也会降低3层薄膜的整体光学性。  相似文献   

7.
用直流溅射法制备了6个不同厚度的超薄Ag膜。结合超薄Ag膜的结构特点,采用了Drude模型联合Lorentz Oscillator模型的解谱方法,得到1~6号样品的厚度分别为4.0,6.2,12.5,26.2,30.0和40.6 nm。从拟合结果的消光系数k图谱中发现,在1号到4号样品中分别于430,450,560和570 nm处出现了表面等离子体共振峰(SPR),随膜厚的增加共振峰宽化且峰位红移。最后,利用SPR理论计算出不同厚度Ag薄膜等离子体共振峰出现的位置,并和实验结果进行了比较。  相似文献   

8.
薄膜厚度对AgInSbTe相变薄膜的光学性质的影响   总被引:1,自引:0,他引:1  
采用射频溅射法制备了Ag8In14Sb55Te23相变薄膜,对深积态薄膜在300℃时进行了热处理,测量了不同厚度薄膜的反射、吸收谱及光学常数。研究了薄膜的光学常数与薄膜厚度的关系。结果表明在一定的厚度范围其光学常数随膜层厚度的不同有较大的变化,尤其在短波长范围内更为明显,这对于短波长记录相变光盘有重要意义。  相似文献   

9.
Ag-MgF2复合纳米金属陶瓷薄膜的微结构及吸收光谱特性研究   总被引:10,自引:2,他引:8  
对用真空蒸发技术制备的Ag-MgF2复合纳米金属陶瓷薄膜(Ag的质量分数为0.15、0.20、0.30)的微结构及吸收光谱特性进行了研究。微结构分析表明薄膜由平均粒径约18nm的fcc-Ag纳米晶粒嵌埋于主要呈非晶态的MgF2基体中所组成。对吸收光谱的研究表明,Ag纳米微粒的表面离子共振吸收峰出现在λ=412nm-417nm波段范围内。随着Ag组分增加,吸收峰强度下降,呈现轻微红移并且逐渐宽化。  相似文献   

10.
椭偏光谱法研究溶胶-凝胶TiO2薄膜的光学常数   总被引:3,自引:0,他引:3       下载免费PDF全文
王晓栋  沈军  王生钊  张志华 《物理学报》2009,58(11):8027-8032
以钛酸丁酯为前驱体,采用溶胶-凝胶工艺成功制备了TiO2薄膜.利用反射式椭圆偏振光谱仪测量了薄膜的椭偏参量ΨΔ,并用Cauchy模型对椭偏参数进行数据拟合,得到了薄膜的厚度和光学常数在380—800 nm的色散关系.用分光光度计测量了薄膜的反射率,并用干涉法计算薄膜的厚度;使用原子力显微镜观测了薄膜的表面微结构,分析讨论了不同退火温度处理的薄膜微结构与光学常数之间的关系.研究结果表明,Cauchy模型能较好地符合溶胶-凝胶TiO2关键词: 光学常数 2薄膜')" href="#">TiO2薄膜 溶胶-凝胶 椭圆偏振  相似文献   

11.
Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.  相似文献   

12.
A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.  相似文献   

13.
A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.  相似文献   

14.
Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·104 Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.  相似文献   

15.
The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.  相似文献   

16.
17.
A transient suppression method for piezoelectric ceramic transducer is presented. By adding some special pedestal pulses to the original transmitted signal, the transient effects in the output of the transducer can be just precisely transmission by use of a narrowband transducer. canceled, thereby achieving the broadband The experimental results show that the transient responses of the sinusoid pulses and coded signals are suppressed successfully and the acoustic waveforms radiated into the surrounding water are improved significantly.  相似文献   

18.
We experimentally demonstrate amplitude squeezed soliton utilizing intensity-dependent self-phase modulation in an asymmetric Sagnac interferometer.The system.whose components are connected via ferrule connector/physical connection(FC/PC)fiber connectors,constitutes all-fiber configuration to generate squeezed soliton.Soliton amplitude reduction measured by homodyne detection is near 4.0 dB below the shot-noise level.Optimal squeezing fields in both simple and compact all-fiber configuration are obtained.  相似文献   

19.
The(2 1)-dimensional nonlinear Schr(o)dinger(NLS)equation with spatially inhomogeneous nonlinearities is investigated,which describes propagation of light in(2 1)-dimensional nonlinear optical media with inhomogeneous nonlinearities.New types of optical modes and nonlinear effects in optical media are presented numerically.The results reveal that the regular split of beam can be obtained in (2 1)-dimensional nonlinear optical media with inhomogeneous nonlinearities,by adjusting the guiding parameter.Furthermore,the stability of beam regular split is discussed numerically,and the results reveal that the beam regular split is stable to the finite initial perturbations.  相似文献   

20.
In the real-world application of face recognition system, owing to the difficulties of collecting samples or storage space of systems, only one sample image per person is stored in the system, which is so-called one sample per person problem. Moreover, pose and illumination have impact on recognition performance. We propose a novel pose and illumination robust algorithm for face recognition with a single training image per person to solve the above limitations. Experimental results show that the proposed algorithm is an efficient and practical approach for face recognition.  相似文献   

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