Local field effects on the radiative lifetime of emitters in surrounding media: Virtual- or real-cavity model?

Duan, Chang‐Kui; Reid, Michael F.; Wang, Zhongqing

doi:10.1016/j.physleta.2005.06.037

Cited by 65 publications

(45 citation statements)

References 14 publications

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“…Furthermore, the presence of the nanocrystal and the surrounding dielectric sensitively influence the excited state lifetime of atomic dipoles inside, and thereby affect the light-matter coupling strength. For a nanocrystal far in the Rayleigh regime (diameter 20 nm) embedded in a medium, the lifetime is given by [29][30][31][32] x n x n x 2 3 , 4 r r 0…”

Section: Single Nanocrystal Fluorescence Scattering and Lifetimementioning

confidence: 99%

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu³⁺:Y₂O₃

et al. 2018

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We report on the coupling of the emission from a single europium-doped nanocrystal to a fiber-based microcavity under cryogenic conditions. As a first step, we study the properties of nanocrystals that are relevant for cavity experiments and show that embedding them in a dielectric thin film can significantly reduce scattering loss and increase the light-matter coupling strength for dopant ions. The latter is supported by the observation of a fluorescence lifetime reduction, which is explained by an increased local field strength. We then couple an isolated nanocrystal to an optical microcavity, determine its size and ion number, and perform cavity-enhanced spectroscopy by resonantly coupling a cavity mode to a selected transition. We measure the inhomogeneous linewidth of the coherent D F 5 0 7 0 -transition and find a value that agrees with the linewidth in bulk crystals, evidencing a high crystal quality. We detect the fluorescence from an ensemble of few ions in the regime of power broadening and observe an increased fluorescence rate consistent with Purcell enhancement. The results represent an important step towards the efficient readout of single rare earth ions with excellent optical and spin coherence properties, which is promising for applications in quantum communication and distributed quantum computation.

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Section: Single Nanocrystal Fluorescence Scattering and Lifetimementioning

confidence: 99%

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu³⁺:Y₂O₃

et al. 2018

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“…These lifetimes, which are somewhat shorter than expected for 5d–4f emission of Eu 2+ at comparable wavelengths, may in part be attributed to defects, however, the main reason is probably the high refractive index n in metal hydrides. It is well‐known that the refractive index or changes of the refractive index of the host medium influence the radiative lifetime , . While the refractive index of metal hydrides is probably 2, the refractive index of many oxides with yellow Eu 2+ emission is rather approximately 1.6 .…”

Section: Eu2+‐doped Hydridesmentioning

confidence: 99%

Recent Advances in Rare Earth‐Doped Hydrides

Kunkel

Wylezich

2018

Zeitschrift anorg allge chemie

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The optical properties of rare earth ions in different inorganic host materials, for instance oxides, silicates, borates, or nitrides, have been used in applications for many years, from color TV to fluorescent tubes, lasers, or pc-LEDs. However, rare earth metal ion-doped hydrides have not really been considered as host lattices and up to now only been studied in a relatively small number of investigations. Yet, for certain metal hydrides these studies, e.g., allowed the determination * Dr. N. Kunkel 137of the crystal field strength and nephelauxetic effect of the hydride anion using the Eu 2+ 5d excited state. In air-sensitive hydrides, the use may be restricted to fundamental studies and local probes. But recently more and more air-stable mixed anionic hydrides have been discovered, which may serve as hosts. This short review summarizes the synthesis and characterization of rare earth metal ion-doped hydrides reported so far.

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“…51 Specifically, Duan and Reid recently re-fitted the measured lifetimes for Y 2 O 3 :Eu 3+ nanoparticles immersed in different solvents and showed that the real-cavity model is also applicable for the lifetime dependence on the refractive index, in addition to the widely used virtual-cavity model. 52,53 For comparison, we performed a similar fitting procedure for Eu 3+ : ZnO nanocrystals with the real-cavity model by the following formula 52,53 where n r ) n eff /n np , τ bulk is denoted as the lifetime of bulk Eu 3+ : ZnO, and n eff is the effective index of refraction aforementioned. We re-fitted the experimental data with eq 2.…”

Section: Luminescence Lifetimementioning

confidence: 99%

Optical Spectroscopy of Eu³⁺ Doped ZnO Nanocrystals

et al. 2008

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The energy levels and local structures of Eu 3+ incorporated in the lattice and surface sites of ZnO nanocrystals were investigated based on the high-resolution fluorescence spectra at 10 K. Radiative emissions from 5 D 1 were first observed for Eu 3+ at the lattice site of ZnO. It is shown that the site symmetry of Eu 3+ at the lattice site descends from C 3V to C s or C 1 , whereas Eu 3+ ions at the surface occupy more disordered sites of the lowest symmetry C 1 . The luminescence decay of 5 D 0 at the lattice site, showing a rise time and longer lifetime, behaves distinctly from that of the surface sites. Because of a small filling factor (52%) of nanoparticles, the 5 D 0 lifetime of Eu 3+ is significantly affected by the surrounding medium, which can be well interpreted with the virtual-cavity model. The Judd-Ofelt intensity parameters of Eu 3+ in ZnO nanocrystals were determined, with Ω 2,4,6 values of (9. 59, 8.11, <0.25) and (21.51, 2.30, <0.25) in units of 10 -20 cm 2 for Eu 3+ at the surface and lattice sites, respectively. A defect-mediated energy transfer from the ZnO band gap to Eu 3+ was observed. The growth mechanism for the incorporation of Eu 3+ into the ZnO lattice was also revealed.

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Local field effects on the radiative lifetime of emitters in surrounding media: Virtual- or real-cavity model?

Cited by 65 publications

References 14 publications

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu³⁺:Y₂O₃

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu³⁺:Y₂O₃

Recent Advances in Rare Earth‐Doped Hydrides

Optical Spectroscopy of Eu³⁺ Doped ZnO Nanocrystals

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Local field effects on the radiative lifetime of emitters in surrounding media: Virtual- or real-cavity model?

Cited by 65 publications

References 14 publications

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu3+:Y2O3

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu3+:Y2O3

Recent Advances in Rare Earth‐Doped Hydrides

Optical Spectroscopy of Eu3+ Doped ZnO Nanocrystals

Contact Info

Product

Resources

About

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu³⁺:Y₂O₃

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu³⁺:Y₂O₃

Optical Spectroscopy of Eu³⁺ Doped ZnO Nanocrystals