操纵来自等离子纳米腔体-发射器混合系统的手性光子生成:从弱耦合到强耦合

IF 6.5 2区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Nanophotonics Pub Date : 2024-01-16 DOI:10.1515/nanoph-2023-0738
Jian Yang, Huatian Hu, Qingfeng Zhang, Shuai Zu, Wen Chen, Hongxing Xu
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引用次数: 0

摘要

通过将光限制在与量子发射器特征尺寸相匹配的深亚波长尺度内,等离子纳米腔体可以有效地使光辐射在强度、方向性和偏振方面具有独特的性质。因此,非手性量子发射器可以通过与具有内在或外在手性的质子纳米腔耦合产生手性光子。作为衡量手性光子纯度的一个重要指标,圆偏振度(DCP)通常由各种分散因素调节,如纳米腔设计、发射器类型和耦合策略。手性光子产生的物理机制,尤其是当等离子体和发射器进入强耦合机制时的物理机制,还较少被探索。在本文中,我们将耦合振荡器模型和杰尼斯-康明斯模型扩展为手性模型,以便在单一理论框架内考虑上述因素,并研究了从弱耦合到强耦合的质子纳米腔-发射器混合系统的手电特性。研究表明,圆差分散射和突出散射 DCP 都依赖于通过打破与发射器的镜像对称性而产生的本征手性,因此可通过耦合强度进行调谐。然而,发光 DCP(高达 87%)与裸纳米腔的外手性密切相关,与耦合强度无关。因此,研究结果揭示了在散射和发光过程中产生手性光子的两种不同物理机制。我们的发现为设计手性光子器件提供了理论指导,并有助于理解手性质子-发射器相互作用。
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Manipulating chiral photon generation from plasmonic nanocavity-emitter hybrid systems: from weak to strong coupling
By confining light into a deep subwavelength scale to match the characteristic dimension of quantum emitters, plasmonic nanocavities can effectively imprint the light emission with unique properties in terms of intensity, directionality, as well as polarization. In this vein, achiral quantum emitters can generate chiral photons through coupling with plasmonic nanocavities with either intrinsic or extrinsic chirality. As an important metric for the chiral-photon purity, the degree of circular polarization (DCP) is usually tuned by various scattered factors such as the nanocavity design, the emitter type, and the coupling strategy. The physical mechanisms of the chiral photon generation, especially when plasmons and emitters step into the strong coupling regime, are less explored. In this paper, we extended the coupled-oscillator and Jaynes–Cummings models to their chiral fashion to account for the above factors within a single theoretical framework and investigated the chiroptical properties of a plasmonic nanocavity-emitter hybrid system from weak to strong coupling. It was demonstrated that both the circular differential scattering and prominent scattering DCP rely on the intrinsic chirality generated by breaking the mirror symmetry with the emitter, and is thereby tunable by the coupling strength. However, the luminescence DCP (as high as 87 %) is closely related to the extrinsic chirality of the bare nanocavity and independent of the coupling strength. The results thus reveal two different physical mechanisms of generating chiral photons in scattering and luminescence. Our findings provide a theoretical guideline for designing chiral photon devices and contribute to the understanding of chiral plasmon-emitter interaction.
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来源期刊
Nanophotonics
Nanophotonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
13.50
自引率
6.70%
发文量
358
审稿时长
7 weeks
期刊介绍: Nanophotonics, published in collaboration with Sciencewise, is a prestigious journal that showcases recent international research results, notable advancements in the field, and innovative applications. It is regarded as one of the leading publications in the realm of nanophotonics and encompasses a range of article types including research articles, selectively invited reviews, letters, and perspectives. The journal specifically delves into the study of photon interaction with nano-structures, such as carbon nano-tubes, nano metal particles, nano crystals, semiconductor nano dots, photonic crystals, tissue, and DNA. It offers comprehensive coverage of the most up-to-date discoveries, making it an essential resource for physicists, engineers, and material scientists.
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