Room-Temperature Polariton Lasing from CdSe Core-Only Nanoplatelets

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Optics

Background:

• Exciton-polaritons are quasiparticles formed from the strong coupling of excitons and photons.
• Nanoplatelets (NPLs) offer tunable optical properties for light-matter interactions.
• Plasmonic nanoparticle lattices can enhance light confinement and manipulation.

Purpose of the Study:

• To investigate exciton-polariton lasing in core-only CdSe NPLs coupled with plasmonic Al nanoparticle lattices.
• To synthesize highly monodisperse CdSe NPLs for detailed decay dynamics studies.
• To explore the role of cavity periodicity in achieving efficient polariton lasing.

Main Methods:

• Synthesis of monodisperse 4-monolayer CdSe core-only nanoplatelets.
• Fabrication of plasmonic aluminum nanoparticle lattices.
• Optical spectroscopy (photoluminescence, reflectivity) to probe exciton-polariton coupling and lasing.
• Theoretical modeling to confirm strong coupling regime and analyze dispersion characteristics.

Main Results:

• Demonstrated strong coupling between CdSe NPL excitons and cavity photons, evidenced by anticrossings and Rabi splitting.
• Observed polariton lasing specifically in lattices with periodicities enabling polariton accumulation.
• Achieved a 25-fold lower lasing threshold compared to photon lasing in similar systems.
• Resolved polariton decay dynamics and pathways due to improved NPL synthesis.

Conclusions:

• Core-only CdSe NPLs coupled with plasmonic Al nanoparticle lattices can exhibit efficient exciton-polariton lasing.
• The open-cavity platform provides a pathway for controlling exciton polaritons.
• This approach holds promise for applications in quantum information processing, optoelectronics, and catalysis.