Question

Write the definition and for what it uess for at nonlinear optics at low power?

Answer 1

Very strong light-matter interaction and optical nolinearity at the level of few photons is achieved by employing optical nanocavities (e.g., in GaAs, GaP, SiC) with embedded quantum emitters, such as quantum dots and color centers.

Nonlinear optical effects provide a natural way of light manipulation and interaction, and form the foundation of applied photonics -- from high-speed signal processing and telecommunication, to ultra-high bandwidth interconnects and information processing. However, relatively weak nonlinear response at optical frequencies calls for operation at high optical powers, or boosting efficiency of nonlinear parametric processes by enhancing local field intensity with high quality-factor resonators near cavity resonance, resulting in reduced operational bandwidth and increased loss due to multi-photon absorption.