Polariton parametric amplifier pump dynamics in the coherent regime

Area of Science:

• Optics and Photonics
• Condensed Matter Physics
• Quantum Optics

Background:

• Microcavity parametric amplifiers are crucial for nonlinear optical processes.
• Understanding coherent dynamics is essential for device performance.
• Polaritons offer unique light-matter interaction properties.

Purpose of the Study:

• To investigate pump coherent dynamics in a II-VI microcavity parametric amplifier.
• To analyze the impact of polariton parametric amplification on pump coherence.
• To study polariton scattering below the amplification threshold.

Main Methods:

• Angle-resolved four-wave mixing spectroscopy.
• Characterization of pump coherent dynamics.
• Analysis of polariton scattering processes.

Main Results:

• Polariton parametric amplification causes strong quenching and saturation of pump coherence lifetime above threshold.
• Below threshold, polariton scattering exhibits angle-dependent collision broadening.
• Collision broadening correlates with scattering efficiency towards the excitonic reservoir.

Conclusions:

• Polariton parametric amplification significantly affects pump coherence in microcavities.
• Scattering processes below threshold provide insights into polariton-exciton interactions.
• The findings are relevant for designing and optimizing parametric amplifiers.