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Cavity Controlled Upconversion in CdSe Nanoplatelet Polaritons.

Mitesh Amin1, Eric R Koessler2, Ovishek Morshed1

  • 1The Institute of Optics, University of Rochester, Rochester, New York 14627, United States.

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|July 30, 2024
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Summary

This study explores exciton-polaritons in colloidal CdSe nanoplatelets within optical cavities. Researchers found that cavity quality factor influences polariton dynamics, showing potential for controlling chemical reactions with these light-matter systems.

Keywords:
CdSe nanoplateletspolariton chemistryquantum dynamicsstrong couplingupconversion

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Area of Science:

  • Quantum optics
  • Materials science
  • Photochemistry

Background:

  • Exciton-polaritons are promising for quantum electrodynamics and polariton-altered chemical reactivity.
  • Understanding polariton photophysics under ambient conditions is crucial for chemical applications.

Purpose of the Study:

  • To investigate the photophysical properties of colloidal CdSe nanoplatelets (NPLs) coupled to a Fabry-Pérot optical cavity.
  • To control strong light-matter interactions and excited state dynamics using cavity quality factor.
  • To assess the potential of NPL-based polariton systems for influencing photochemical reaction rates.

Main Methods:

  • Coupling colloidal CdSe NPLs to a Fabry-Pérot optical cavity.
  • Varying the cavity quality factor to control light-matter interactions.
  • Measuring photoluminescence (PL) and polariton dynamics.
  • Performing quantum dynamical simulations.

Main Results:

  • Increasing cavity quality factor led to significant population of the upper polariton (UP) state and substantial UP photoluminescence (PL).
  • Excitation of lower polariton (LP) states resulted in upconverted PL emission from the UP branch.
  • Polariton dynamics were observed on timescales of approximately 100 ps.
  • Quantum dynamical simulations showed excellent agreement with experimental data.

Conclusions:

  • Cavity quality factor effectively controls exciton-polariton dynamics in CdSe NPLs.
  • The observed dynamics suggest significant potential for NPL-based polariton systems in altering photochemical reaction rates.
  • These findings are a key step towards developing practical polariton photochemistry platforms.