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Plasmon-modulated bistable second-harmonic generation in a nonlinear microcavity coupled to a metallic nanoparticle
Optics Express
|December 13, 2023
Summary
This study introduces a nonlinear microcavity coupled with a metallic nanoparticle to achieve bistable second-harmonic (SH) generation and optical bistability (OB). The system enhances SH efficiency and reduces OB thresholds using plasmon-induced pathways and control fields.
Area of Science:
- Nonlinear optics
- Quantum optics
- Plasmonics
Background:
- Achieving multiple nonlinear effects like second-harmonic (SH) generation and optical bistability (OB) simultaneously is challenging due to limited intrinsic nonlinearity in most materials.
- Nonlinear microcavities coupled with metallic nanoparticles (MNPs) offer a promising platform to enhance nonlinear optical phenomena.
Purpose of the Study:
- To propose and theoretically investigate a nonlinear microcavity coupled to an MNP system for achieving bistable SH generation.
- To explore the coexistence of SH generation and OB effects.
- To enhance SH conversion efficiency and reduce OB thresholds using plasmon-induced pathways and control fields.
Main Methods:
- Theoretical modeling of a nonlinear microcavity coupled to an MNP.
- Simulation of nonlinear optical effects under the influence of two counterpropagating driving fields and a control field.
- Analysis of SH generation pathways, including traditional two-photon processes and plasmon-induced pathways.
Main Results:
- Demonstrated the coexistence of SH generation and OB in the proposed system by optimizing excitation and detuning.
- Showcased simultaneous enhancement of SH conversion efficiency and reduction of OB thresholds via plasmon-induced pathways.
- Observed a linear increase in maximum SH efficiency with increasing control field intensity.
- Identified significant modulation of bistable SH efficiency, interval, and thresholds by the relative phase between driving and control fields.
Conclusions:
- The MNP-coupled nonlinear microcavity is an effective platform for achieving enhanced and controllable bistable SH generation.
- The proposed system offers a novel approach to simultaneously boost nonlinear responses and reduce operational thresholds.
- The findings provide a pathway for designing advanced optical devices with tailored nonlinear properties.
