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Spontaneous emission
About: Spontaneous emission is a research topic. Over the lifetime, 12855 publications have been published within this topic receiving 323684 citations.
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TL;DR: In this paper, the photoluminescence (PL) spectra were measured at room temperature and some interesting features were found on the PL spectra, including surface-state trapped exciton emission, including single phonon-one photon coupling course with the Eg(ν1) phonon attendance.
130 citations
TL;DR: Femtosecond optical spectroscopy is used to observe directly the vacuum Rabi oscillations associated with the coupled exciton-photon mode splitting in a semiconductor quantum microcavity and shows the coherent evolution of the cavity polarization.
Abstract: We have used femtosecond optical spectroscopy to observe directly the vacuum Rabi oscillations associated with the coupled exciton-photon mode splitting in a semiconductor quantum microcavity. When the microcavity is impulsively excited by a coherent short optical pulse, the time-resolved emission from the cavity shows beats corresponding to the oscillation between cavity and exciton modes, with a decay corresponding to approximately twice the cavity lifetime. Interferometric pump-probe measurements clearly show the coherent evolution of the cavity polarization.
130 citations
TL;DR: In this paper, the authors have presented a study supported in part by the Basque Departamento de Educación, Universidades e Investigació, and the University of the Balque Country UPV/EHU (Contract No. 00206.215-13639/2001).
Abstract: This work has been supported in part by the Basque Departamento de Educacion, Universidades e Investigacion, the University of the Basque Country UPV/EHU (Contract No. 00206.215-13639/2001) and the Spanish Ministerio de Ciencia y Tecnologia (Contract No. MAT2001-0946).
130 citations
TL;DR: In this article, an epitaxial, vertically oriented nanorods of ZnO are grown at low temperature (80°C) on the (0002) plane of GaN single crystals by electrodeposition in an aqueous solution.
Abstract: Arrays of epitaxial, vertically oriented nanorods of ZnO are grown at low temperature (80°C) on the (0002) plane of GaN single crystals by electrodeposition in an aqueous solution. The freestanding nanocolumns are prepared by a template-free method based on simple solution chemistry. At room temperature, the nanorods present an amplified ultraviolet emission centered at 381nm with an excitation threshold at 4.4MWcm−2. The amplified emission of the ZnO columns is dominated by the radiative recombination of excitons.
130 citations
TL;DR: In this paper, a band-tail model was used to study the exciton localization effect of increasing the thickness of a single-quantum-well structure up to 2.5 nm.
Abstract: Temperature-dependent photoluminescence (PL) measurements are performed on In0.23Ga0.77N/GaN single-quantum-well structures with different well thickness. Based on a band-tail model, the exciton localization effect is studied. The exciton localization effect is enhanced by increasing quantum-well thickness up to 2.5 nm. If the quantum-well thickness is further increased to above 2.5 nm, the exciton localization effect becomes weak. Finally, when the quantum-well thickness is increased to 5 nm, the exciton localization effect cannot be observed. In addition, the PL intensity decreases monotonically with increasing the quantum-well thickness. In connection with an excitation-power dependent PL measurement, the result of the quantum-well thickness dependent PL intensity can be attributed to quantum confined Stark effect, which becomes particularly strong in the wide quantum-well structure. Based on our optical investigation, the presented article indicates that the emission mechanism is dominated by the exci...
130 citations