Chiral Emission from Optical Metasurfaces and Metacavities

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Advanced Photonics Research Pub Date : 2024-07-22 DOI:10.1002/adpr.202400060
Jungho Han, Heejoo Jang, Yeonsoo Lim, Seong S. Kim, Jeheon Lee, Young Chul Jun
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Abstract

Chiral emission exhibiting a large degree of circular polarization (DCP) is important in diverse applications ranging from displays and optical storage to optical communication, bioimaging, and medical diagnostics. Although chiral luminescent materials can generate chiral emissions directly, they frequently suffer from either low DCP or low quantum efficiencies. Achieving high DCP and quantum efficiencies simultaneously remains extremely challenging. This review introduces an alternative approach to chiral emission. Chiral emission with large DCP can be readily achieved by combining conventional achiral emitters with chiral metasurfaces. Particularly, this article focuses on recent experimental and theoretical studies on perovskite metasurfaces and metacavities that employ achiral perovskite materials. First, chiral photoluminescence from extrinsic and intrinsic perovskite metasurfaces is explained together with theoretical discussions on metasurface design based on reciprocity and critical coupling. Chiral photoluminescence from other achiral materials is also explained. Subsequently, chiral electroluminescence from perovskite metacavities and other achiral materials is discussed. Finally, it is concluded with future perspectives. This review provides physical insights into how ideal chiral emission can be realized by optimizing the design of metasurfaces and metacavities. Compact chiral light sources with both near‐unity DCP and strong emission intensities can have far‐reaching consequences in a wide range of future applications.
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光学元表面和元腔的手性发射
在从显示器和光存储到光通信、生物成像和医疗诊断等各种应用中,表现出高度圆偏振(DCP)的手性发射非常重要。虽然手性发光材料可以直接产生手性发射,但它们经常受到低 DCP 或低量子效率的困扰。同时实现高 DCP 和量子效率仍然极具挑战性。本综述介绍了手性发射的另一种方法。通过将传统的非手性发射器与手性元表面相结合,可以轻松实现大 DCP 的手性发射。本文特别关注了最近关于采用非手性包晶材料的包晶元表面和元腔的实验和理论研究。首先,解释了来自外在性和内在性包晶元表面的手性光致发光,并对基于互易性和临界耦合的元表面设计进行了理论探讨。还解释了其他非手性材料的手性光致发光。随后,讨论了来自包晶体元腔和其他非手性材料的手性电致发光。最后,以未来展望作结。这篇综述从物理角度阐述了如何通过优化元表面和元腔的设计来实现理想的手性发射。同时具有近乎统一 DCP 和强发射强度的紧凑型手性光源将在未来的广泛应用中产生深远影响。
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