Polariton condensation and surface enhanced Raman in spherical ZnO microcrystals

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Volkov, V.V. ORCID: 0000-0003-2990-3580, Oliver, D.J. ORCID: 0000-0001-7877-0900 and Perry, C. ORCID: 0000-0003-1517-468X, 2020. Polariton condensation and surface enhanced Raman in spherical ZnO microcrystals. Nature Communications, 11: 4908. ISSN 2041-1723

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Official URL: https://doi.org/10.1038/s41467-020-18666-4

Abstract

Preparation and characterization of polariton Bose–Einstein condensates in micro-cavities of high quality are at the frontier of contemporary solid state physics. Here, we report on three-dimensional polariton condensation and confinement in pseudo-spherical ZnO microcrystals. The boundary of micro-spherical ZnO resembles a stable cavity that enables sufficient coupling of radiation with material response. Exciting under tight focusing at the low frequency side of the bandgap, we detect efficiency and spectral nonlinear dependencies, as well as signatures of spatial delocalization of the excited states which are characteristics of dynamics in polariton droplets. Expansion of the photon component of the condensate boosts the leaky field beyond the boundary of the ZnO microcrystals. Using this, we observe surface polariton field enhanced Raman responses at the interface of ZnO microspheres. The results demonstrate how readily available spherical semiconductor microstructures facilitate engineering of polariton based electronic states and sensing elements for diagnostics at interfaces.

Item Type:

Journal article

Publication Title:

Nature Communications

Creators:

Volkov, V.V., Oliver, D.J. and Perry, C.

Publisher:

Nature Publishing Group

Date:

30 September 2020

Volume:

ISSN: