Perfect absorber based on toroidal dipole in metamaterial of silicon and gallium phosphide

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2025-06-08 DOI:10.1016/j.photonics.2025.101410

Xiaoyun Wang , Sili Huang , Yan Chen , Shanjun Chen , Wei Dai , Jie Hou , Jingyu Wang , Weimin Yang , Shiyi Song

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引用次数: 0

Abstract

In this work, we propose a metamaterial perfect absorber based on the toroidal dipole mode. A nanopore is introduced in the center of GaP nanopixel, and a Si nanodisk is placed in it as the pattern layer. The dielectric layer comprising of SiO₂ is on top of the substrate of Au. The finite difference time domain (FDTD) method was used to numerically simulate the metamaterial absorber, in which the absorption peak appeared at 1255.3 nm with a peak value of 99.6 % and a Q factor of 154.4. This study also demonstrated the high sensitivity of 339.6 nm/RIU to the environmental refractive index, surpassing previously reported designs and highlighting the potential applications of refractive index sensing. The proposed composite structure narrowband absorber based on Si and GaP has great application potential in perfect absorption, refractive index sensing and nonlinear photonics.

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基于硅和磷化镓超材料环向偶极子的完美吸收体

在这项工作中，我们提出了一种基于环形偶极子模式的超材料完美吸收体。在GaP纳米像元的中心引入一个纳米孔，并在其中放置一个硅纳米片作为图案层。由SiO2组成的介电层位于Au衬底之上。利用时域有限差分（FDTD）方法对超材料吸波器进行了数值模拟，发现超材料吸波器的吸收峰出现在1255.3 nm处，峰值为99.6 %，Q因子为154.4。该研究还证明了对环境折射率的高灵敏度为339.6 nm/RIU，超越了先前报道的设计，并突出了折射率传感的潜在应用。本文提出的基于硅和GaP的复合结构窄带吸收材料在完全吸收、折射率传感和非线性光子学等方面具有很大的应用潜力。

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

Photonics and Nanostructures-Fundamentals and Applications 工程技术-材料科学：综合

CiteScore

5.00

自引率

3.70%

发文量

审稿时长

62 days

期刊介绍： This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.