Broadband and tunable high linear and circular dichroism with two-dimensional all-dielectric chiral metasurface

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces Pub Date : 2025-06-12 DOI:10.1016/j.surfin.2025.106933

YiLun Wang , Minhua Li , ChenHao Yu , HaoGuang Jiang , Libo Qian , JianFeng Dong

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引用次数: 0

Abstract

Chiral metasurfaces have a wide range of applications in ultrathin circular polarizers, optical sensing and other chiral regulation research. However, simultaneous broadband, high circular dichroism (CD) and linear dichroism (LD) remains a challenge. In this paper, an all-dielectric metasurface based on phase change material Ge₂Sb₂Se₄Te₁ (GSST) working in the mid-infrared (MIR) band is designed to achieve broadband and tunable high CD and LD, which consists of a single-layer tilted elliptical hole-shaped structure. Simulation results show that when GSST is changed from crystalline state to amorphous state, CD band (CD > 0.8) is shifted from 3476 nm - 3634 nm to 2138 nm - 2153 nm, realizing a blueshift of 1500 nm, and LD band (LD < -0.4) is shifted from 4295 nm - 4517 nm to 3383 nm - 3547 nm, realizing a blueshift of 900 nm. The chiral response of the designed metasurface is revealed through the analysis of electromagnetic field distributions and multipole decomposition under the incidence of different polarized light. This work has potential applications in the future MIR optical integrated system with tunable devices.

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宽带和可调谐的高线性和圆二色性与二维全介电性手性超表面

手性超表面在超薄圆偏振片、光学传感等手性调控研究中有着广泛的应用。然而，同时实现宽带、高圆二色性（CD）和线性二色性（LD）仍然是一个挑战。本文设计了一种工作在中红外（MIR）波段的基于相变材料Ge2Sb2Se4Te1 （GSST）的全介电超表面，该超表面由单层倾斜椭圆孔状结构组成，可实现宽带可调谐高CD和LD。仿真结果表明，当GSST由晶态转变为非晶态时，CD带(CD >；0.8)从3476 nm - 3634 nm位移到2138 nm - 2153 nm，实现了1500 nm的蓝移，LD波段(LD <；-0.4)从4295 nm - 4517 nm位移到3383 nm - 3547 nm，实现了900 nm的蓝移。通过分析不同偏振光入射下的电磁场分布和多极分解，揭示了所设计的超表面的手性响应。这项工作在未来可调谐器件的MIR光集成系统中具有潜在的应用前景。

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

Surfaces and Interfaces Chemistry-General Chemistry

CiteScore

8.50

自引率

6.50%

发文量

753

审稿时长

35 days

期刊介绍： The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)