Tunable Nonlinearity and Efficient Harmonic Generation from a Strongly Coupled Light-Matter System

• URL: http://arxiv.org/abs/2203.00691v1
• Date: Tue, 1 Mar 2022 19:00:00 GMT
• Title: Tunable Nonlinearity and Efficient Harmonic Generation from a Strongly Coupled Light-Matter System
• Authors: Davis M. Welakuh and Prineha Narang
• Abstract summary: We investigate the origins of the experimentally observed enhancement of resonant SHG and THG under strong light-matter coupling. We find that the enhancement of the nonlinear conversion efficiency has its origins in a modification of the associated nonlinear optical susceptibilities. Our results pave the way for predicting and understanding quantum nonlinear optical phenomena in strongly coupled light-matter systems.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Strong light-matter coupling within electromagnetic environments provides a promising path to modify and control chemical and physical processes. The origin of the enhancement of nonlinear optical processes such as second-harmonic and third-harmonic generation (SHG and THG) due to strong light-matter coupling is attributed to distinct physical effects which questions the relevance of strong coupling in these processes. In this work, we leverage a first-principles approach to investigate the origins of the experimentally observed enhancement of resonant SHG and THG under strong light-matter coupling. We find that the enhancement of the nonlinear conversion efficiency has its origins in a modification of the associated nonlinear optical susceptibilities as polaritonic resonances emerge in the nonlinear spectrum. Further, we find that the nonlinear conversion efficiency can be tuned by increasing the light-matter coupling strength. Finally, we provide a general framework to compute the harmonic generation spectra from the displacement field as opposed to the standard approach which computes the harmonic spectrum from the matter-only induced polarization. Our results address a key debate in the field, and pave the way for predicting and understanding quantum nonlinear optical phenomena in strongly coupled light-matter systems.

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