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Room temperature strong coupling effects from single ZnO nanowire microcavity
Ayan Das1, Junseok Heo, Adrian Bayraktaroglu
1Center for Photonic and Multiscale Nanomaterials, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA.
Optics Express
|June 21, 2012
Summary
Strong coupling in ZnO nanowire microcavities shows a large Rabi splitting at room temperature. This indicates Bose-Einstein condensate-like behavior at low polariton densities, suggesting efficient polariton dynamics.
Area of Science:
- Condensed Matter Physics
- Optics
- Nanotechnology
Background:
- Dielectric microcavities enable strong light-matter interactions.
- Zinc oxide (ZnO) nanowires offer unique optoelectronic properties.
Purpose of the Study:
- Investigate strong coupling effects in a ZnO nanowire embedded in a dielectric microcavity.
- Characterize polariton dispersion and emission non-linearity at room temperature.
Main Methods:
- Fabrication of a dielectric microcavity with an embedded ZnO nanowire.
- Optical measurements including photoluminescence spectroscopy.
- Time-resolved measurements to study polariton relaxation dynamics.
Main Results:
- Observed a large Rabi splitting of approximately 100 meV, confirming strong coupling.
- Detected non-linear polariton emission with a low threshold (1.63 μJ/cm²).
- Evidence of dynamic condensation and absence of relaxation bottleneck in lower polaritons.
Conclusions:
- Demonstrated strong coupling in ZnO nanowire-microcavity systems at room temperature.
- Achieved polariton condensation at densities significantly below the Mott transition.
- Polariton relaxation time decreases with increasing polariton density, indicating efficient dynamics.
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