Influence of Vibrational Strong Coupling on an Ordered Liquid Crystal
Influence of Vibrational Strong Coupling on an Ordered Liquid Crystal
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振动强耦合对有序液晶的影响
DOI：
10.1021/acs.jpcb.2c04004
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Yanagi Hisao
中科院分区：
文献类型：
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作者：
Stemo Garrek;Yamada Hayata;Katsuki Hiroyuki;Yanagi Hisao
振动强耦合和振动极化子的形成是腔光子和分子振动模之间强烈的光-物质相互作用的结果。反映微观光-物质相互作用强度的拉比分裂参数揭示了腔内分子排列和协调振动运动的信息。我们研究了4-氰基-4‘-辛基联苯液晶分子在各向同性和近晶A相中的振动强耦合。通过控制温度，我们观察到随着从各向同性相变到近晶A相变，拉比分裂发生了∼30%的变化，同时近晶A相中拉比分裂开始出现偏振相关的各向异性。基于估算的取向分布函数，我们发现各向同性和近晶A相中观测到的Rabi分裂差异只能通过考虑腔内集体振动运动的影响来解释，集体振动运动影响了振动强耦合区域下的分子性质。
Vibrational strong coupling and the formation of vibrational polaritons are a result of strong light–matter interaction between a cavity photon and a molecular vibrational mode. The Rabi splitting parameter, which reflects the microscopic light–matter interaction strength, reveals information about the molecular alignment and concerted vibrational motion inside the cavity. We have investigated vibrational strong coupling of 4-cyano-4′-octylbiphenyl liquid crystal molecules in isotropic and smectic A phases. We observed a ∼30% change in the Rabi splitting with the phase transition from isotropic to smectic A by controlling the temperature, together with the onset of polarization-dependent anisotropy of the Rabi splitting in the smectic A phase. Based on the estimated orientational distribution function, we show that the observed Rabi splitting difference in the isotropic and smectic A phases can only be explained by taking into account the influence of collective vibrational motion in the cavity, which affects the molecular properties under the vibrational strong coupling regime.