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Strong Exciton-Photon Coupling with Colloidal Nanoplatelets in an Open Microcavity
Lucas C Flatten1, Sotirios Christodoulou2,3, Robin K Patel1
1Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom.
Nano Letters
|October 15, 2016
Summary
Strong coupling between CdSe nanoplatelets and microcavity modes was achieved at room temperature. This demonstrates potential for novel photonic devices utilizing polaritonic and spinoptronic effects.
Area of Science:
- Materials Science
- Quantum Optics
- Nanotechnology
Background:
- Colloidal semiconductor nanoplatelets possess quantum size effects and strong optical transitions.
- These properties arise from their monolayer thickness and large lateral dimensions.
Purpose of the Study:
- To demonstrate room-temperature strong coupling between CdSe nanoplatelets and microcavity photonic modes.
- To investigate the polariton-mediated hybridization of exciton transitions.
Main Methods:
- Fabrication of an open planar microcavity.
- Integration of colloidal CdSe nanoplatelets within the microcavity.
- Optical spectroscopy to observe exciton-photon coupling.
Main Results:
- Observed vacuum Rabi splittings of 66 ± 1 meV (heavy hole) and 58 ± 1 meV (light hole) at room temperature.
- Demonstrated polariton-mediated hybridization of both heavy and light hole exciton transitions.
- Calculated a transition dipole moment of (575 ± 110) D for nanoplatelet excitons.
Conclusions:
- CdSe nanoplatelets enable strong light-matter interactions in microcavities.
- The large oscillator strength and quantum yield suggest potential for advanced photonic devices.
- This work opens avenues for combining polaritonic and spinoptronic functionalities.
