实现闪烁晶体阵列高空间分辨率的全角度高反射超薄复合薄膜

IF 2.4 3区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS
Jing Yang, Linwei Wang, Zhang Chen, Zhongjun Xue, Shuwen Zhao, Dongzhou Ding
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引用次数: 0

摘要

当前核医学成像系统的性能在很大程度上受到探测器性能的限制,而高空间分辨率的探测器需要高光产率的闪烁体阵列。在这项工作中,我们首次模拟和设计了一个覆盖整个氧化硅酸镥钇发射光谱带的分布式Bragg反射器(多层介电膜),该反射器由三个1/4波长(λ/4)主膜系统组成,中心为420、500和575 nm。为了实现闪烁体发射面全入射角下的超高反射率,我们提出了一种结合介质膜和金属膜/漫反射胶粘剂的主光学结构。为了解释这一机制,我们还模拟了实际内表面光收集反射率的变化。实验结果表明,在总入射角下,高反射率反射器的组合可以实现全角度高反射率。我们发现介质膜不改变晶体内部的全反射结构,而阻光层改变并增加了介质膜的角度反射。这些发现为表面处理和闪烁晶体阵列的设计提供了重要的见解,对高空间分辨率光学成像系统具有深远的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Full-angle high-reflection ultrathin composite film realizing high spatial resolution of scintillation crystal array
The performance of current nuclear medicine imaging systems is largely limited by the performance of detectors, and high spatial resolution detectors require high optical yield scintillator arrays. In this work, we simulated and designed for the first time a distributed Bragg reflector (multilayer dielectric film) that covers the entire lutetium yttrium oxyorthosilicate emission spectral band and consists of three 1/4 wavelength (λ/4) primary film systems centered at 420, 500, and 575 nm. In order to achieve ultrahigh reflectivity at the full incidence angle of the scintillator emitting surface, we propose a master optical configuration combining the dielectric film with a metal film/diffuse reflection adhesive. To explain this mechanism, we also simulated the change in reflectivity of the actual inner surface light collection. Experimental results show that a combination of a highly reflective reflector can achieve full-angle high reflectance at the total angle of incidence. We find that the dielectric film does not change the total reflection structure inside the crystal, while the light-blocking layer changes and increases the angular reflection of the dielectric film about the angle. These findings provide important insights into surface treatment as well as the design of scintillation crystal arrays, with far-reaching implications for high spatial resolution optical imaging systems.
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来源期刊
Journal of Vacuum Science & Technology A
Journal of Vacuum Science & Technology A 工程技术-材料科学:膜
CiteScore
5.10
自引率
10.30%
发文量
247
审稿时长
2.1 months
期刊介绍: Journal of Vacuum Science & Technology A publishes reports of original research, letters, and review articles that focus on fundamental scientific understanding of interfaces, surfaces, plasmas and thin films and on using this understanding to advance the state-of-the-art in various technological applications.
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