Strong bound exciton-photon coupling in ZnO whispering gallery microcavity

Sun, Liaoxin; Dong, Hongxing; Xie, Wei; Lü, Jian; Chen, Zhanghai; Shen, Xuechu; Lü, Wei

doi:10.1364/oe.21.030227

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…To further confirm whether the peaks P 4 and P 5 at RT (Figure a) originate from the WGM resonance, the mode numbers in the UV region for sample 2 (the 435 nm ZnO nanowire on Al 2 O 3 /Ag) were calculated. In the UV region, the polarization of emission mainly shows TE preference because the recombination of TE-polarized A, B excitons and their phonon replicas dominate the emission, and thus, the observed peaks P 4 and P 5 may be assigned to the TE–WGMs. , The refractive index for TE polarized light can be expressed using Sellmiere’s dispersion function where n 1 (λ) represents the ZnO refractive index at a wavelength of λ. For the hexagonal WGM resonance, the phase shift of total internal reflection (TIR) follows the equation where N is the interference order of the resonance (i.e., the mode number), D is the diameter of the ZnO nanowire, is the phase shift of TIR at the ZnO–air interface, and ϕ′ is the phase shift of TIR at the ZnO–Al 2 O 3 /Ag interface. , The derivation process of ϕ′ is described in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

“…In the UV region, the polarization of emission mainly shows TE preference because the recombination of TE-polarized A, B excitons and their phonon replicas dominate the emission, and thus, the observed peaks P 4 and P 5 may be assigned to the TE−WGMs. 45,46 The refractive index for TE polarized light can be expressed using Sellmiere's dispersion function 47…”

Section: Resultsmentioning

confidence: 99%

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Surface Plasmon Enhanced Exciton Transitions, Cavity Resonance Effects, and Exciton–/Polariton–LO Phonon Interactions in ZnO Nanowires

et al. 2020

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Optical properties of single-subwavelength ZnO nanowires are highly improved by the Al 2 O 3 layer/rough Ag film plasmonic structure as a substrate, owing to the exciton−surface plasmon (SP) interactions. The ZnO nanowire luminescence efficiency was enhanced on the Al 2 O 3 layer/rough Ag film as compared with the SiO 2 /Si substrate. The exciton transitions can be highly enhanced with narrow linewidth and distinguished clearly above 80 K. Typically, three different bound exciton transitions originating from different impurities as trap centers can be identified at 80 K and traced clearly before thermal dissociation. Meanwhile, the strong local electromagnetic field induced by SP can enhance the whispering-gallery-mode (WGM) resonance and the exciton−/exciton−polariton (polariton for short)−longitudinal optical (LO) phonon interaction. The formation of WGM polaritons with energy in the region of first-order LO phonon replica is efficiently promoted by polariton−LO phonon scattering relaxation. These findings provide an effective method for designing novel semiconductor-nanostructure luminescence or lasing devices in future.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Surface Plasmon Enhanced Exciton Transitions, Cavity Resonance Effects, and Exciton–/Polariton–LO Phonon Interactions in ZnO Nanowires

et al. 2020

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Revealing Optical Properties of Reduced‐Dimensionality Materials at Relevant Length Scales

et al. 2015

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Reduced-dimensionality materials for photonic and optoelectronic applications including energy conversion, solid-state lighting, sensing, and information technology are undergoing rapid development. The search for novel materials based on reduced-dimensionality is driven by new physics. Understanding and optimizing material properties requires characterization at the relevant length scale, which is often below the diffraction limit. Three important material systems are chosen for review here, all of which are under investigation at the Molecular Foundry, to illustrate the current state of the art in nanoscale optical characterization: 2D semiconducting transition metal dichalcogenides; 1D semiconducting nanowires; and energy-transfer in assemblies of 0D semiconducting nanocrystals. For each system, the key optical properties, the principal experimental techniques, and important recent results are discussed. Applications and new developments in near-field optical microscopy and spectroscopy, scanning probe microscopy, and cathodoluminescence in the electron microscope are given detailed attention. Work done at the Molecular Foundry is placed in context within the fields under review. A discussion of emerging opportunities and directions for the future closes the review.

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Optical performance improvement in hydrothermal ZnO/graphene structures for ultraviolet lasing

Qin

Zhu

et al. 2018

J. Mater. Chem. C

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Strong bound exciton-photon coupling in ZnO whispering gallery microcavity

Cited by 7 publications

References 16 publications

Surface Plasmon Enhanced Exciton Transitions, Cavity Resonance Effects, and Exciton–/Polariton–LO Phonon Interactions in ZnO Nanowires

Surface Plasmon Enhanced Exciton Transitions, Cavity Resonance Effects, and Exciton–/Polariton–LO Phonon Interactions in ZnO Nanowires

Revealing Optical Properties of Reduced‐Dimensionality Materials at Relevant Length Scales

Optical performance improvement in hydrothermal ZnO/graphene structures for ultraviolet lasing

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