Papers
More filters
TL;DR: In this paper , the spatial and polarization dependent exciton-photon coupling in a ZnO microrod has been investigated. And the coupling of excitons and WGMs leads to split modes which exhibit a clear spatial dependence due to the uneven field distribution of WGM on the surface.
2 citations
15 Jul 2021
TL;DR: In this article, high-order resonance peaks appeared in the visible range and with polarization dependence in the ultraviolet (UV) region of the microphotoluminescence (micro-PL) spectrum in whispering gallery mode (WGM) ZnO microrod cavity have been thoroughly studied at room temperature.
Abstract: High order phenomena in the visible range and with polarization dependence in the ultraviolet (UV) region of the microphotoluminescence (micro-PL) spectrum in whispering-gallery mode (WGM) ZnO microrod cavity have been thoroughly studied at room temperature. WGM ZnO microrod cavity with good crystallinity is produced by the CVD growth method, and the ZnO microrod structures are characterized by structural and optical methods. Through the micro-PL spectrum measurement of the ZnO microrod, it is found that high-order resonance peaks appeared in the visible region. The different polarization conditions can be adjusted by rotating the angles of the polarizer, and it is proved that the micro-PL spectrum has strong polarization-dependent behavior in the UV region. Our results imply broad application potentials in the study of ZnO microrod-based photonic cavity devices.
1 citations
Cited by
More filters
Proceedings Article•
21 Jun 2015TL;DR: In this article, the authors studied the dynamic tunability of WGM resonators and found that they provide a high level of functionality of these devices, and that they are attractive cavities for integrated optical systems because of their small size, small mode volumes and high quality factors.
Abstract: Whispering gallery mode (WGM) resonators are attractive cavities for integrated optical systems because of their small size, small mode volumes and high quality factors. These properties have been theoretically and experimentally studied for different devices including narrow bandwidth optical filters, laser resonators [1] and biochemical sensors. In such applications, the dynamic tunability of the resonators provides a high level of functionality of these devices.
7 citations
TL;DR: In this paper , the polariton condensation is induced under the non-resonant excitation by linearly polarized femtosecond laser pulses with different polarization directions, 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.
Abstract: 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 laser pulses with different polarization directions. The dynamical angle-resolvedk-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 condensation process for cavity exciton polaritons at room temperature.
4 citations