基于二氧化钒的蛾眼形按需宽带和可切换完美吸收器。

Moth-eye shaped on-demand broadband and switchable perfect absorbers based on vanadium dioxide.

机构信息

Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.

Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.

出版信息

Sci Rep. 2020 Mar 11;10(1):4522. doi: 10.1038/s41598-020-59729-2.

DOI:10.1038/s41598-020-59729-2

PMID:32161273

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7066148/

Abstract

Two biomimetic, moth-eye structure, perfect absorbers in the visible and near infrared regions are introduced and investigated. The moth-eye structure is made up of vanadium oxide (VO), which is a phase change material that changes from an insulator state to a metallic state at around 85 °C. The VO structure sits on top of a sapphire (AlO) dielectric spacer layer, above a gold (Au) back reflector. Two perfect absorbers are designed, one with perfect absorption over an ultra-broadband range between 400 and 1,600 nm, for both the insulating and metallic phases, while the second can switch between being a perfect absorber or not in the range 1,000 and 1,600 nm. The absorption profiles and electric and magnetic fields are examined and discussed to provide insight into how absorbers function in the four different situations.

摘要

介绍并研究了两种仿生蛾眼结构的完美吸收体，分别在可见和近红外区域工作。蛾眼结构由氧化钒（VO）制成，VO 是一种相变材料，在 85°C 左右从绝缘状态转变为金属状态。VO 结构位于蓝宝石（AlO）介电间隔层之上，金（Au）背反射器之上。设计了两种完美吸收体，一种在绝缘和金属相的超宽 400nm 到 1600nm 波段内具有完美吸收，而另一种在 1000nm 到 1600nm 波段内可以在完美吸收和非完美吸收之间切换。研究并讨论了吸收谱以及电磁场，以深入了解吸收体在这四种不同情况下的工作原理。