Giant and Tunable Optical Nonlinearity in Single-Crystalline 2D Perovskites due to Excitonic and Plasma Effects

DICHTL, PAUL; ABDELWAHAB, IBRAHIM; GRINBLAT, GUSTAVO; LENG, KAI; CHI, XIAO; I.-H. PARK; NIELSEN, MICHAEL P.; OULTON, RUPERT F.; K. P. LOH; MAIER, STEFAN A

Conferencia; Frontiers in Optics; 2019

2D Ruddlesden-Popper-type lead halide perovskites exhibit a strong third-order nonlinear response around excitonic resonance, which is characterized with Z-scan measurements. We find large absolute values and a sign change of both nonlinear refraction and absorption.