共查询到19条相似文献,搜索用时 125 毫秒
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本文采用多变量的误差分析方法给出光学薄膜参数对于椭偏角ψ,反射率R,入射角和吸收薄膜厚度的误差因子公式。由此便可确定出光学参数的测量精度。本文还利用误差因子与薄膜折射率,薄膜厚度和入射角的关系曲线,讨论了最佳测量条件和测量结构的选取。并且指出,在同时确定两个或多个未知参数时,不能只由可测量量随某一个参数变化的灵敏来讨论和确定此参数的测量精度。 相似文献
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为了考察基底温度对氧化铝薄膜折射率以及沉积厚度的影响情况,在不同基底温度环境下,通过离子辅助电子束蒸发方式,在玻璃基底上制备了同一Tooling因子条件下所监测到相同厚度的Al2O3薄膜,利用分光光度计测量光谱透过率,依据光学薄膜相关理论,计算了基底温度在25℃~300℃范围内获得的膜层实际物理厚度为275.611 nm~348.447 nm,以及膜层折射率的变化。通过对实验结果的数值计算和曲线模拟,给出了基底温度对于薄膜的折射率和实际厚度的影响情况。 相似文献
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采用PECVD技术在BK7玻璃基底上沉积了不同厚度的单层SiO2(折射率为1.46)和SiNx(折射率为1.84)光学薄膜,并对这2种膜层进行抗激光损伤阈值(LIDT)测试,分析讨论了PECVD技术制备的单层光学薄膜与抗激光损伤特性之间的关系。实验结果表明:PECVD技术制备的单层SiO2薄膜有较高的LIDT,薄膜光学厚度在o/4~o/2之间时,在光学厚度为350 nm时,LIDT有最小值21.7 J/cm2,光学厚度为433 nm时,LIDT有最大值27.9 J/cm2。SiNx薄膜的LIDT随着光学厚度增加而减小,在光学厚度为o/4时,LIDT有最大值29.3 J/cm2,光学厚度为o/2时,LIDT有最小值4.9 J/cm2。 相似文献
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椭偏测厚仪测量结果的计算机数据处理 总被引:2,自引:0,他引:2
本详尽介绍了椭偏术测量单层透明薄膜折射率和厚度的方法,采用一种数字迭代计算方法,由测量得到的起偏角A和检偏角P直接算出所测薄膜的折射率和厚度。经过数值试验及与标准值比对,由此编制的计算程序具有准确,快速,方便的特点。 相似文献
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A method has been proposed for determining the optical properties of a thin film layer on absorbing substrates. The film optical parameters such as thickness, refractive index, absorption coefficient, extinction coefficient and the optical energy gap of an absorbing film are retrieved from the interference fringes of the reflection spectrum at normal incidence. The envelopes of the maxima of the spectrum EM and of the minima Em are introduced in analytical forms to find the reflectance amplitudes at the interfaces and approximate values of the thin film refractive index. Then, the interference orders and film thickness are calculated to get accurate values of the needed optical parameters. There are no complex fitting procedures or assumed theoretical refractive index dispersion relations. The method is applied to calculate the optical properties of an epitaxial gallium nitride thin film on a silicon (1 1 1) substrate. Good agreement between our results and the published data are obtained. 相似文献
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《Chinese Journal of Physics (Taipei)》2018,56(5):2350-2356
We theoretically study and propose the design concept of a new non-contact measurement method of the thickness and refractive index of dielectric film. The needed measurement set-up includes a probe, an optical detection head and a spectrometer. The probe is composed of two patches of dielectric substrates, and the optical detection head is used to detect the reflective spectra. After depositing a testing dielectric film on the two patches, the coating film thickness and refractive index can be determined by analyzing the normal-incidence reflective spectra of the two dielectric substrates. This method has two requirements. First, the coating dielectric films on the two substrates must be the same. Second, the two dielectric substrates respectively have higher and lower refractive indices than the testing dielectric film. 相似文献
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Sheng-Hui Chen Kai Wu Chien-Cheng Kuo Sheng-Ju Ma Cheng-Chung Lee 《Optical Review》2009,16(4):479-482
A new method based on the polarization interferometer structure has been applied to measure the optical admittance, the refractive
index and thickness of a thin film. The structure is a vibration insensitive optical system. There is one Twyman-Green interferometer
part to induce a phase difference and one Fizeau interferometer part to induce the interference in the system. The intensities
coming from four different polarizers were measured at the same time to prevent mechanical vibration influence. Using the
polarization interferometer, the optical admittance, the refractive index and thickness of a single layer of Ta2O5 thin film has been measured. The measurement results were compared with the results obtained by ellipsometer. The results
meet reasonable values in both refractive index and thickness. 相似文献
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J. Kučírek 《Czechoslovak Journal of Physics》1973,23(12):1382-1394
Thin oxide films on titanium formed by heating were studied by the ellipsometric method. To obtain the complex refractive index and film thicknesses, the ellipsometric measurements were performed by means of the immersing method: each sample was measured first in air and then in a liquid of known refractive index (in our case CCl4). The optical constants and the oxide film thickness were computed by means of a computer from two pairs of ellipsometric values. To state the optical constants of clean titanium surface the graphic-computational method was proposed and applied. The measurements were carried out at two wavelengths on oxide films grown in air and dry oxygen by thermal oxidation at temperatures from 150 to 700 °C. It has been shown that when increasing the film thickness the refractive index of the film decreases, whereas the absorption coefficient is independent on the film thickness. Optical constants of oxide films growing in dry oxygen are smaller than those growing in air. 相似文献
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S. Bosch 《Applied Physics A: Materials Science & Processing》1992,54(5):431-436
A simple procedure to minimize the number of trial-and-error high-vacuum depositions required to manufacture a thin film filter prototype is presented. For optical coatings obtained by thermal evaporation, the main difficulty is the accurate characterization (refractive index and thickness) of the layers under the actual deposition conditions. The proposed method is able to describe dispersion as well as inhomogeneity in the refractive index of the component layers. It requires only a suitable substrate holder attachment and standard thin film measurement equipment: a spectrophotometer and a three wavelength ellipsometer. The technique is illustrated with the development of an anti-reflection (AR) coating for glass which also includes an inhomogeneous layer. 相似文献
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依据全反射理论和棱镜耦合原理,实现了对棱镜折射率及波导薄膜材料折射率和厚度的同步测量。使用高准直半导体激光器激光入射到棱镜内部与波导膜的分界面上,逐步旋转棱镜或改变棱镜的入射角,得到棱镜耦合M线,曲线前面几组的波谷为波导模激发,在M线左侧收尾处有一个不完整波峰,其反射光强随入射角迅速衰减,为全反射时的临界点,由此可实现棱镜及波导薄膜参数的同步测量;用此法测量了棱镜耦合一体化平面波导棱镜的折射率和聚甲基丙烯酸甲酯(PMMA)聚合物波导薄膜的折射率和厚度。测量棱镜折射率精度为±1.9×10-4,波导薄膜折射率和厚度的精度分别为±6.2×10-4 μm和±1.6×10-2 μm。 相似文献
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D. I. Bilenko V. P. Polyanskaya M. A. Getsman D. A. Gorin A. A. Neveshkin A. M. Yaschenok 《Technical Physics》2005,50(6):742-746
The results of numerical simulation of a nanodimensional film-transition layer-absorbing substrate structure are presented.
It is found that the transition layer affects the accuracy of determining the refractive index and thickness of the nanodimensional
coating. It is shown that the introduction of the effective values of the refractive index and absorption coefficient of the
substrate improves the accuracy of ellipsometric measurements of the nanodimensional film parameters. Physical (full-scale)
and numerical experiments demonstrate that, when the thickness and refractive index of a nanodimensional film on a substrate
with an unknown transition layer comparable in thickness with the film are measured, it is appropriate to replace the substrate-transition
layer structure by a substrate with effective optical parameters. It is found that a change in the thickness of the transition
layer does not noticeably affect the accuracy of determining the thickness and refractive index of the film deposited when
the effective values of the refractive index and absorption coefficient of the substrate are used. 相似文献