Tunable narrowband and broadband coexisting absorber enabled by a simple all-metal grating for sensing applications

IF 1.9 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Frontiers in Physics Pub Date : 2023-08-16 DOI:10.3389/fphy.2023.1234275

Jianwei Wang, Ze Zhang, Z. Lin, Hanting Li, Huan Gao, Z. Fan, Haifeng Liu

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Abstract

We realize a tunable narrowband and broadband coexisting absorber based on a simple step-shaped all-metal grating structure. The absorber presents an ultra-narrow absorption band of 1.5 nm and a relatively broad absorption band of 29.8 nm, both with nearly 100% absorption in the infrared region. The mechanism underlying the dual-band perfect absorption is the interaction between two diffraction coupled surface plasmon polariton (SPP) modes with one of them modulated by a cavity resonance. Influences of structure parameters on the absorption performance are numerically investigated. It is found that the positions of the two perfect absorption peaks can be easily tuned both independently and together by changing the structural parameters. In addition, the designed grating structure presents excellent sensing performance with sensitivity and figure of merit as high as 2,514 nm/RIU and 1,600 RIU−1, respectively. The excellent sensing performance, flexible tenability and simple structure design endow this grating absorber with great potential in high-precision biochemical sensing applications.

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可调谐窄带和宽带共存吸收器，由一个简单的全金属光栅实现，用于传感应用

基于简单的阶梯形全金属光栅结构，实现了窄带宽带可调谐共存吸收器。吸收剂具有1.5 nm的超窄吸收带和29.8 nm的较宽吸收带，在红外区几乎100%吸收。双带完美吸收的机制是两种衍射耦合表面等离子激元(SPP)模式之间的相互作用，其中一种模式由腔共振调制。数值研究了结构参数对吸声性能的影响。研究发现，通过改变结构参数，两个完美吸收峰的位置既可以单独调谐，也可以一起调谐。此外，所设计的光栅结构具有优异的传感性能，灵敏度和品质系数分别高达2514 nm/RIU和1600 RIU−1。优异的传感性能、灵活的耐用性和简单的结构设计使该光栅吸收体在高精度生化传感应用中具有很大的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers in Physics Mathematics-Mathematical Physics

CiteScore

4.50

自引率

6.50%

发文量

1215

审稿时长

12 weeks

期刊介绍： Frontiers in Physics publishes rigorously peer-reviewed research across the entire field, from experimental, to computational and theoretical physics. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, engineers and the public worldwide.