Suárez-Forero D G, Riminucci F, Ardizzone V, Karpowicz N, Maggiolini E, Macorini G, Lerario G, Todisco F, De Giorgi M, Dominici L, Ballarini D, Gigli G, Lanotte A S, West K, Baldwin K, Pfeiffer L, Sanvitto D
CNR NANOTEC, Institute of Nanotechnology, Via Monteroni, 73100 Lecce, Italy.
Dipartimento di Fisica, Università del Salento, Strada Provinciale Lecce-Monteroni, Campus Ecotekne, Lecce 73100, Italy.
Phys Rev Lett. 2021 Apr 2;126(13):137401. doi: 10.1103/PhysRevLett.126.137401.
Exciton-polaritons are hybrid light-matter excitations arising from the nonperturbative coupling of a photonic mode and an excitonic resonance. Behaving as interacting photons, they show optical third-order nonlinearities providing effects such as optical parametric oscillation or amplification. It has been suggested that polariton-polariton interactions can be greatly enhanced by inducing aligned electric dipoles in their excitonic part. However, direct evidence of a true particle-particle interaction, such as superfluidity or parametric scattering, is still missing. In this Letter, we demonstrate that dipolar interactions can be used to enhance parametric effects such as self-phase modulation in waveguide polaritons. By quantifying these optical nonlinearities, we provide a reliable experimental measurement of the direct dipolar enhancement of polariton-polariton interactions.
激子极化激元是由光子模式与激子共振的非微扰耦合产生的混合光物质激发。它们表现为相互作用的光子，具有光学三阶非线性，可产生诸如光学参量振荡或放大等效应。有人提出，通过在激子部分诱导排列的电偶极子，可以大大增强极化激元-极化激元相互作用。然而，诸如超流性或参量散射等真正的粒子-粒子相互作用的直接证据仍然缺失。在本信函中，我们证明偶极相互作用可用于增强诸如波导极化激元中的自相位调制等参量效应。通过量化这些光学非线性，我们提供了极化激元-极化激元相互作用直接偶极增强的可靠实验测量。
