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>Design and development of an optical reflective notch filter using the ion-assisted deposition technique with stepwise modulated thickness for avionics applications
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Design and development of an optical reflective notch filter using the ion-assisted deposition technique with stepwise modulated thickness for avionics applications
This paper presents research work about the design and fabrication of a 44-layer optical reflective notch filter. The performance of the fabricated notch filter was studied at normal (0 degrees) and oblique (45 degrees) incidence angles. In addition, the paper also discusses a three-layer broadband antireflective coating on both sides of the multilayer stack to suppress the ripples in the passband region. The thickness-modulated reflective stack of the filter was designed by using the materials Al2O3 (1.63) and SiO2 (1.46). Optimization of the multilayer stack was carried out by using the damped least-squares algorithm. The theoretical and experimental results from the ion-assisted e-beam deposited samples for single notch reflective filters are presented. Good agreement in the design and experimental results was observed when the deposition process was controlled by time of evaporation. Further, the filter was characterized for the optical properties by using a UV-VIS-NIR spectrophotometer, surface morphology and protective properties using field emission scanning electron microscopy, a coherence correlation interferometer, and water contact angle. (C) 2020 Optical Society of America
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机译:本文提出了关于44层光反射槽滤波器的设计和制造的研究工作。在正常(0度)和倾斜(45度)入射角的情况下研究了制造的陷波滤波器的性能。此外,本文还讨论了多层叠层两侧的三层宽带抗反射涂层,以抑制通带区域中的涟漪。通过使用材料Al 2 O 3(1.63)和SiO 2(1.46)设计过滤器的厚度调制的反射叠层。通过使用阻尼最小二乘算法进行多层堆叠的优化。提出了用于单凹口反射滤波器的离子辅助电子束沉积样品的理论和实验结果。当通过蒸发时间控制沉积过程时,观察到设计和实验结果的良好一致性。此外,通过使用UV-Vis-Nir分光光度计,表面形态和保护性能,使用场发射扫描电子显微镜,相干相关干涉仪和水接触角来表征过滤器的特征。 (c)2020美国光学学会
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