用于传感应用的基于纳米狭缝微腔的窄带吸收器。

Nanoslit-microcavity-based narrow band absorber for sensing applications.

作者信息

Lu Xiaoyuan, Zhang Lingxuan, Zhang Tongyi

出版信息

Opt Express. 2015 Aug 10;23(16):20715-20. doi: 10.1364/OE.23.020715.

DOI:10.1364/OE.23.020715

Abstract

We propose an ultranarrow bandwidth perfect infrared absorber consisting of a metal periodic structured surface with nanoslits, a spacer dielectric, and a metal back plate. Its bandwidth and aborption are respectively about 8 nm and 95%. The thickness of the nanobars and the spacer, and the width of the nanoslits are primary factors determining the absorption performance. This structure not only has narrow bandwidth but also can obtain the giant electric field enhancement in the tiny volume of the nanoslits. Operated as a refractive index sensor, this structure has figure of merit as high as 25. It has potential in biomedical and sensing applications.

摘要

我们提出了一种超窄带宽完美红外吸收体，它由一个带有纳米狭缝的金属周期性结构表面、一个间隔电介质和一个金属背板组成。其带宽和吸收率分别约为8纳米和95%。纳米棒和间隔层的厚度以及纳米狭缝的宽度是决定吸收性能的主要因素。这种结构不仅带宽窄，而且能在纳米狭缝的微小体积内获得巨大的电场增强。作为一种折射率传感器，这种结构的品质因数高达25。它在生物医学和传感应用方面具有潜力。