Spatial and polarization-resolved exciton–photon coupling in quasi-whispering-gallery mode ZnO microrod cavity

Wei, Huihui; Song, Jun; Guo, Yunhui; Yuan, Xiaobo; Ren, Junfeng

doi:10.1016/j.optcom.2022.128014

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…The pumping polarization could result in the excitation of different excitons. Recently, polarization dependence in the exciton-photon coupling below the condensation threshold has been reported [29]. Based on the selection rules, for the σ polarization configuration (with both the polarization and the wave vector perpendicular to the c axis, i.e.…”

Section: Resultsmentioning

confidence: 99%

Excitation-polarization-dependent dynamics of polariton condensates in the ZnO microwire at room temperature

Chen

Zhou

et al. 2022

J. Phys.: Condens. Matter

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Based on ZnO microcavities with high quality factors, where the gain medium exhibits confinement of wave packets due to the intrinsically formed whispering gallery microcavity, strong coupling between excitons and cavity photons can be obtained at room temperature resulting in hybrid quasiparticles, e.g. exciton polaritons. In this work, polariton condensation is induced under the non-resonant excitation by linearly polarized femtosecond pulses with different polarization directions. The dynamical angle-resolved k-space spectra of the photoluminescence emission of polariton condensates are measured with sub-picosecond resolution by the self-developed femtosecond angle-resolved spectroscopic imaging technique. Our results show that the ultrafast dynamics of polariton condensation is sensitive to the polarization direction of the excitation pulses which can be explained qualitatively by the combined effect of selective excitation of distinct exciton modes in the sample and the effective coupling strength of the excitation pulses in the ZnO microcavity for various polarization directions. This work strengthened the understanding of the underlying physics of the condensation process for cavity exciton polaritons at room temperature.room temperature.

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Section: Resultsmentioning

confidence: 99%

Excitation-polarization-dependent dynamics of polariton condensates in the ZnO microwire at room temperature

Chen

Zhou

et al. 2022

J. Phys.: Condens. Matter

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Preferential grain growth and impact of aluminum and tin doping on the physical properties of ZnO microrods

Mageswari¹,

Palanivel²,

Rahman³

et al. 2022

J Mater Sci: Mater Electron

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Strong exciton-photon coupling in self-hybridized organic–inorganic lead halide perovskite microcavities

Tahir,

Jung,

Rashid

et al. 2023

Nanophotonics

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Controlling coherent light–matter interactions in semiconductor microcavities is at the heart of the next-generation solid-state polaritonic devices. Organic–inorganic hybrid perovskites are potential materials for room-temperature polaritonics owing to their high exciton oscillator strengths and large exciton binding energies. Herein, we report on strong exciton-photon coupling in the micro-platelet and micro-ribbon shaped methylammonium lead bromide single crystals. Owing to high crystallinity and large refractive index, the as-grown perovskite microcrystals serve as self-hybridized optical microcavities along different orientations due to their distinct physical dimensionalities. In this regard, the perovskite micro-platelet forms a simple Fabry–Perot microcavity in out-of-plane orientation, while the micro-ribbon functions as a Fabry–Perot type waveguide microcavity within the plane of the perovskite sample. Consequently, excitons in these microcavities strongly interact with their corresponding uncoupled cavity modes, yielding multimode exciton-polaritons with Rabi splitting energies ∼205 and 235 meV for micro-platelet and micro-ribbon geometry, respectively. Furthermore, micro-ribbon geometry displays Young’s double-slit-like interference patterns, which together with the numerical simulation readily reveals the parity and the mode order of the uncoupled cavity modes. Thus, our results not only shed light on strong exciton-photon coupling in various morphologies of methylammonium lead bromide microcrystals but also open an avenue for advanced polaritonic devices.

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Spatial and polarization-resolved exciton–photon coupling in quasi-whispering-gallery mode ZnO microrod cavity

Cited by 3 publications

References 43 publications

Excitation-polarization-dependent dynamics of polariton condensates in the ZnO microwire at room temperature

Excitation-polarization-dependent dynamics of polariton condensates in the ZnO microwire at room temperature

Preferential grain growth and impact of aluminum and tin doping on the physical properties of ZnO microrods

Strong exciton-photon coupling in self-hybridized organic–inorganic lead halide perovskite microcavities

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