基于液晶金属表面的热质可控光学吸收器
Francesca Petronella1, Tristan Madeleine2, Vincenzo De Mei3
1National Research Council of Italy, Institute of Crystallography, CNR-IC, Rome Division, Area della Ricerca Roma 1 Strada Provinciale 35d, n. 9, 00010 Montelibretti (RM), Italy.
ACS applied materials & interfaces
|October 10, 2023
概括
这项研究介绍了一种新的超表面光学吸收器,使用银纳米立方体和液晶. 这种创新的设计实现了近红外光谱中可调节的光吸收,为自适应光学元件铺平了道路.
科学领域:
- 纳米光子和元材料
- 液晶光子学 液晶光子学
- 光学吸收技术的技术.
背景情况:
- 由亚波长元素组成的元表面具有优良的光学性能,但缺乏动态调整性.
- 现有的超表面在其作为自适应光学组件的功能能力上是有限的.
- 需要动态控制的光学设备,利用地表技术.
研究的目的:
- 开发一个可调节的超表面基于光学吸收器.
- 为实现动态控制,将阴性液晶 (NLC) 与超表面集成.
- 为了展示一个可控制光线的光学吸收器,具有可调节的吸收带.
主要方法:
- 使用自组装的银纳米立方体 (AgNCs) 在金层上用聚电解质介电间隔器制造一个元表面.
- 通过光对齐的基板将元表面与平面对齐的阴性液晶 (NLC) 层集成.
- 谱学和热学研究以表征光学特性和可调性.
主要成果:
- 制造的光学吸收器在近红外 (750-770 nm) 呈现出明显的反射波段.
- 在共振波长下观察到高吸收效率 (∼60%) 和显著的光热效率 (时间常数 34 s).
- 综合的超表面-NLC系统展示了一个可光热调节的吸收波段超过大约46nm.
结论:
- 开发的超表面-NLC混合结构提供了一个高效和可调节的光学吸收器.
- 这种活跃的超表面表现出非凡的光线可控吸收能力.
- 这些发现使得开发新一代动态控制的自适应光学元件成为可能.
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