Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.115
Publication date: 6th July 2018
We use tunable nanoscale defect cavities to create zero-dimensional exciton-polaritons [1]. Data on the strong coupling as well as mode engineering is shown as a function of cavity detuning. At ambient conditions, we observe non-equilibrium exciton-polariton condensation [2] with strong lateral confinement on the wavelength scale [3]. Threshold and line narrowing are analyzed as a function of excitation density. Both, in real and momentum space we observe the distinct signature of strong transversal confinement in the condensation. First order coherence properties are investigated by means of a Michelson interferometer.
As a building block towards extended lattices, we realize two coupled cavities by focused ion beam milling and thermal scanning probe lithography. These photonic molecules are investigated by means of atomic force microscopy and optical measurements, to compare both fabrication methods. Furthermore, we investigate different ways to improve the optical properties of the active material e.g., photo-degradation and inhomogeneity.
These are the initial steps towards studying quantum fluids in extended, arbitrary potential landscapes at ambient conditions.
References
[1] D. Urbonas et al., ACS Photonics 3 (9), 1542–1545 (2016).
[2] J. D. Plumhof et al., Nat. Mater. 13, 247 (2014).
[3] F. Scafirimuto et al., ACS Photonics 5 (1), 85–89 (2018).
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