Giant Optical Nonlinearity Interferences In Terahertz Quantum StructuresPaper (MM20)
Wed, 11 Nov 2020 12:30am to 12:45am
Second-order optical nonlinearities can be enhanced by orders of magnitude in resonantly excited
nanostructures. However, they are frequently not as heightened as expected, limiting their exploitation in nanostructured THz nonlinear optics. Here, we show that the second-order nonlinear susceptibility can vary by orders of magnitude as a result of giant destructive interference effects. Using THz QCLs as a model source to investigate interband and intersubband nonlinearities, we show that these giant interferences are a result of an interplay of the second-order nonlinear contributions of multiple light and heavy hole states.This work permits to engineer optical nonlinearities and access complex bandstructures.
Authors: Houver, Sarah; Lebreton, Armand; Pereira, Teldo; Xu, Gangyi; Colombelli, Raffaele; Kundu, Iman; Linfield, Edmund; Davies, Giles; Mangeney, Juliette; Tignon, Jerome; Ferreira, Robson; Dhillon, Sukhdeep
Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris Sud, Université Paris-Saclay, Instituto de Física, Laboratoire de Physique de l'Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, Laboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, School of Electronic and Electrical Engineering