Light-Matter Coupling Strength Controlled by the Orientation of Organic Crystals in Plasmonic Cavities
Light-Matter Coupling Strength Controlled by the Orientation of Organic Crystals in Plasmonic Cavities
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DOI：
10.1021/acs.jpcc.0c00692
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发表时间：
2020-06-04
影响因子：
3.7
通讯作者：
Rivas, Jaime Gomez
中科院分区：
文献类型：
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作者：
Berghuis, Anton Matthijs;Serpenti, Vincent;Rivas, Jaime Gomez
强光-物质耦合是材料性质工程的重要机制，也是研究极化激元物理的重要平台。有机晶体中的激子由于其跃迁偶极矩的大幅度和明确的取向而成为研究光-物质耦合的有趣候选者。我们证明了在并四苯晶体中的激子耦合到由等离子体纳米粒子的各向异性阵列形成的开放腔中的光学模式，并研究了激子偶极矩与腔场的对准的函数的耦合强度。腔和晶体的各向异性提供了一种实用的方法，通过相对于等离子体阵列旋转晶体，将光-物质耦合强度从弱耦合状态调节到强耦合状态的开始。控制单个激子材料内的耦合的可能性，为研究耦合强度对极化激子物理的影响铺平了道路，例如激子-极化激子动力学，输运或凝聚。
Strong light-matter coupling is a powerful mechanism to engineer materials properties and a platform to study polariton physics. Excitons in organic crystals are interesting candidates for the investigation of light-matter coupling due to the large magnitude and well-defined orientation of their transition dipole moments. We demonstrate the coupling of excitons in tetracene crystals to optical modes in open cavities formed by anisotropic arrays of plasmonic nanoparticles and investigate the coupling strength as a function of the alignment of the exciton dipole moment to the cavity field. The anisotropy of the cavity and the crystal provides a practical method to tune the light-matter coupling strength from weak to the onset of the strong coupling regime, by rotating the crystal with respect to the plasmonic array. The possibility to control the coupling within a single excitonic material, paves the way to study the effects of the coupling strength on polariton physics, such as exciton-polariton dynamics, transport, or condensation.