| Summary: | 碩士 === 國立中央大學 === 光電科學研究所 === 90 === Abstract
The gradient-index optical thin film design will become an important topic, since the fabrication of gradient-index optical thin film is easier. Furthermore, among the several methods, only the Fourier transform methods can used as a physical means to explain and understand. Thus it is unnecessary to used try and error or substitution method to derive results, so it is fast and accurate to derive a first step refractive index distribution and correct transmittance spectrum. Then Fourier transforms is used to obtain a result for coupled layer design or modify input transmittance spectrum to get the best design. This thesis has two parts, part one is the use of radio frequency ion beam sputtering and moving target coat composite thin film of refractive index continuously varied from 2.2 to 1.48 and low absorption by Ta and SiO2 targets, to effect the control refractive index to a lower interval of 0.03; Part two is to design optical performance of gradient-index optical thin film by using mathematics formula of Fourier transform to write a computer program. That is transform the transmittance spectrum to a refractive index vs. optical thickness curve by Fourier transform, and finish the first step of an automatic coating control program. To obtain the expected optical performance, the proven moving target method for coating gradient-index optical thin film is practical.
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