Frenkel-like plasmonic excitons in plasmonic lattices: Energy spectrum, radiative relaxation, and Bose-Einstein condensation

Interaction and coherence of a plasmon-exciton polariton condensate

Polaritons are quasiparticles arising from the strong coupling of electromagnetic waves in cavities and dipolar oscillations in a material medium. In this framework, localized surface plasmon in metallic nanoparticles defining optical nanocavities have attracted increasing interests in the last decade. This interest results from their sub-diffraction mode volume, which offers access to extremely high photonic densities by exploiting strong scattering cross-sections. However, high absorption losses in metals have hindered the observation of collective coherent phenomena, such as condensation. I…

优化等离激元晶格与单层半导体的强光物质耦合

Optimizing strong light-matter coupling of plasmonic lattices and monolayer semiconductors

研究通过优化等离激元晶格与单层半导体的耦合，减少界面不规则性，实现大面积极子晶格，应用于极化控制与拓扑极子学。

Pliable Polaritons: Wannier Exciton Plasmon Coupling in Metal Semiconductor Structures

Plasmonic structures are known to support the modes with subwavelength volumes in which the field matter interactions are greatly enhanced. Coupling between the molecular excitations and plasmons leading to formation of plexcitons has been investigated for a number of organic molecules. However, plasmon-exciton coupling in metal semiconductor structures have not experienced the same degree of attention. In this work we show that the very strong coupling regime in which the Rabi energy exceeds the exciton binding energy is attainable in semiconductor cladded plasmonic nanoparticles and leads to…

On the origin of blueshifts in organic polariton condensates

We report on the origin of energy-shifts in organic polariton condensates. The localised nature of Frenkel excitons in molecular semiconductors precludes interparticle Coulomb exchange interactions -the latter being the dominant mechanism for blueshifts in inorganic semiconductor microcavities that bear Wannier-Mott excitons. We examine the contribution of optically induced change of the intracavity non-linear refractive index, gain induced frequency-pulling and quenching of the Rabi splitting, as well as the role of polariton-exciton and polariton-polariton scattering in the energy-shift of t…

Monitoring strong coupling in nonlocal plasmonics with electron spectroscopies

Plasmon-exciton polaritons provide exciting possibilities to control light-matter interactions at the nanoscale by enabling closer investigation of quantum optical effects and facilitating novel technologies based, for instance, on Bose-Einstein condensation and polaritonic lasing. Nevertheless, observing and visualising polaritons is challenging, and traditional optical microscopy techniques often lead to ambiguities regarding the emergence and strength of the plasmon-exciton coupling. Electron microscopy offers a more robust means to study and verify the nature of plexcitons, but is still hi…

等离子激元-激子-极化子激光

Plasmon-Exciton-Polariton Lasing

金属纳米结构提供了一个工具包，用于产生低于衍射极限的相干光。基于等离子体激元的激光依赖于发射体（诸如有机荧光团）的粒子数反转以及由等离子体激元共振提供的反馈。在这种被称为弱光物质耦合的状态下，系统的辐射特性可以用Purcell效应来描述。分子激子与等离子体激元结构产生的电磁场之间的强轻物质耦合导致了被称为等离子体激子极化激元（PEP）的混合准粒子的形成。由于这些准粒子的玻色子性质，激子极化激元凝聚可以导致在比传统光子激光器低得多的阈值功率下的类激光发射。在这里，我们观察到PEP激光通过一个黑暗的等离子体激元模式在一个低阈值的金属纳米粒子阵列中的光泵的有机系统。有趣的是，尽管活性材料的量子效率降低，但通过增加轻物质耦合的程度来降低激光的阈值功率，突出了导致激光的超快动力学，即，受激散射这些结果展示了一个独特的室温平台，用于探索开放腔结构中激子极化激元的物理学，并为将这种片上激光器件与当前光子学和有源超材料平面技术集成铺平了道路。

通过自上而下方法直接写入室温极化激元凝聚体晶格

Direct writing of room temperature polariton condensate lattice by top-down approach

本文提出用聚焦离子束在嵌入有机染料SMILES的平面微腔上直接刻蚀晶格，以自上而下方式实现高折射率对比度的室温极化激元凝聚体晶格，并支持周期、准周期、无序及缺陷结构研究。

室温有机极子-极化子凝聚态在晶格中的实现

Room temperature Organic Exciton-Polariton Condensate in a Lattice

本研究在室温下实现了有机极子-极化子凝聚态在晶格中的首次实验，利用荧光蛋白作为增益材料，展示了可控加载凝聚态和间隙孤子模式的形成，展示了其在相干玻色子应用中的灵活性和成本效益。