超材料四极模式与分子振动的强耦合

IF 3.5 2区 物理与天体物理 Q2 PHYSICS, APPLIED
Qiqige Wulan, Lu Liu, Li Xing, Jiachen Yu, Jingyu Wang, Zhijun Liu
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引用次数: 0

摘要

超材料多极模式因其强大的近场和高品质因数,为探索光物质相互作用的基本特性和技术应用提供了一个引人注目的方案。在这项工作中,我们展示了超材料四极模式与中红外分子振动之间的强耦合和模式杂化。在我们用聚二甲基硅氧烷(PDMS)薄膜自旋涂层制作的十字形超表面中,在斜入射时会激发出品质因数为 33 的四极共振,其电偶极分量能有效地耦合到 Si-CH3 振动,并具有明显的光谱分裂和反交叉行为。耦合强度随 PDMS 薄膜厚度的增加而增加,厚度超过 27 nm 时达到强耦合状态。在强耦合机制下测得的拉比分裂为 0.79-1.13 太赫兹。我们的研究结果表明,在等离子纳米结构中使用四极模式为实现振动极化子提供了一种有效而便捷的方法,有望应用于超灵敏红外传感和光化学领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strong coupling of metamaterial quadrupolar mode with molecular vibration
Metamaterial multipolar mode presents a compelling scheme for exploring fundamental properties and technological applications of light-matter interactions due to its strong near field and high quality factor. In this work, we demonstrate strong coupling and mode hybridization between metamaterial quadrupolar mode and molecular vibration in the mid-infrared. In our fabricated cross-shaped metasurfaces spin-coated with a polydimethylsiloxane (PDMS) film, a quadrupolar resonance with a quality factor of 33 is excited at oblique incidence, whose electric dipolar component efficiently couples to the Si-CH3 vibration with pronounced spectral splitting and anti-crossing behaviors. The coupling strength increases with the PDMS film thickness and reaches the strong coupling regime for thickness above 27 nm. A Rabi splitting of 0.79–1.13 THz is measured in the strong coupling regime. Our results indicate that the use of quadrupolar mode in plasmonic nanostructures provides an effective and convenient approach for the realization of vibrational polaritons, which hold promise for applications in ultrasensitive infrared sensing and photochemistry.
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来源期刊
Applied Physics Letters
Applied Physics Letters 物理-物理:应用
CiteScore
6.40
自引率
10.00%
发文量
1821
审稿时长
1.6 months
期刊介绍: Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.
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