Multiple micro-cavity vibro-polaritons formation with different vibrational bands of the methylene group

IF 2.5 3区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2024-07-01 DOI:10.1016/j.photonics.2024.101294
Mario Malerba , Mathieu Jeannin, Paul Goulain, Adel Bousseksou, Raffaele Colombelli, Jean-Michel Manceau
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Abstract

We present an experimental technique to accurately predict the formation of vibro-polaritons from a molecular polymeric film embedded in a resonant mid-infrared cavity. Using simple Fourier-transform reflectance measurement, we extract the complex dielectric function of a polyethylene film using Kramers-Kronig relations. The fitted dielectric function can be plugged into a numerical code to predict the strength and dispersion of the strong light-matter coupling regime between the quantized electromagnetic modes of a microcavity and the vibrational bands of the molecules. As a demonstration, we experimentally resolve the simultaneous formation of multiple vibro-polariton modes issued from the strong coupling of some vibrational bands of the methylene group (CH2) in a 2.5-μm-thick polyethylene film embedded in a microcavity. We measure a Rabi splitting of 6.3 THz for the stretching doublet around 87.5 THz and a Rabi splitting of 1.1 THz for the scissoring doublet around 43.7 THz, in excellent agreement with numerical predictions.

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亚甲基不同振带形成的多重微腔振动极化子
我们提出了一种实验技术,用于准确预测嵌入共振中红外腔的分子聚合物薄膜振动极化子的形成。通过简单的傅立叶变换反射率测量,我们利用克拉默-克罗尼格关系提取了聚乙烯薄膜的复介电常数。将拟合的介电函数输入数值代码,就能预测微腔的量化电磁模式与分子振动带之间的强光-物质耦合机制的强度和分散性。作为演示,我们通过实验解析了在嵌入微腔的 2.5 微米厚聚乙烯薄膜中,由亚甲基(CH2)的一些振动波段的强耦合同时形成的多个振动极化子模式。我们在 87.5 太赫兹附近测得拉伸双音的拉比分裂为 6.3 太赫兹,在 43.7 太赫兹附近测得剪切双音的拉比分裂为 1.1 太赫兹,这与数值预测非常吻合。
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来源期刊
CiteScore
5.00
自引率
3.70%
发文量
77
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.
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