金属-聚（9，9-二辛基芴）-金属空穴中激子-极化子物理的构象控制
Conformational Control of Exciton-Polariton Physics in Metal - Poly(9,9-dioctylfluorene) - Metal Cavities
摘要：
在金属-聚（9，9-二辛基芴）-金属微腔中，通过聚合物骨架的构象变化来控制激子-极化激元物理。使用薄膜样品含有越来越多的分数的$β$相链段，一个系统的研究报告的模式特性和所产生的光发射特性的空腔内含有两个不同的激子子在同一个半导体。从角分辨反射率测量观察到无序玻璃相激子的超强耦合，对于TE和TM-偏振光，拉比分裂能量超过1.05 eV（激子跃迁能量的30%以上）。然后通过引入$β$相激子诱导较低极化激元分支的分裂，并且分裂随着它们的生长分数而增加。在所有情况下，光致发光从最低的极化激元分支发出，允许对发射能量及其角度变化施加构象控制。因此，能够实现具有高度饱和的蓝紫发射的无色散腔。实验结果进行了讨论的充分Hopfield哈密顿推广到两个激子振子的情况下。考虑到其强耦合行为的准确描述的半导体的分子特性的重要性被直接考虑，在具体关系的作用的电子振动结构。
英文摘要：
Control is exerted over the exciton-polariton physics in metal - Poly(9,9-dioctyl fluorene) - metal microcavities via conformational changes to the polymer backbone. Using thin-film samples containing increasing fractions of $β$-phase chain segments, a systematic study is reported for the mode characteristics and resulting light emission properties of cavities containing two distinct exciton sub-populations within the same semiconductor. Ultrastrong coupling for disordered glassy-phase excitons is observed from angle-resolved reflectivity measurements, with Rabi splitting energies in excess of 1.05 eV (more than 30% of the exciton transition energy) for both TE- and TM-polarized light. A splitting of the lower polariton branch is then induced via introduction of $β$-phase excitons and increases with their growing fraction. In all cases, the photoluminescence emanates from the lowermost polariton branch, allowing conformational control to be exerted over the emission energy and its angular variation. Dispersion-free cavities with highly saturated blue-violet emission are thus enabled. Experimental results are discussed in terms of the full Hopfield Hamiltonian generalized to the case of two exciton oscillators. The importance of taking account of the molecular characteristics of the semiconductor for an accurate description of its strong coupling behaviour is directly considered, in specific relation to the role of the vibronic structure.
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