Resonance amplification of defect emission in ZnO-inverted opal

Transformation of broadband emission of oxygen defects in the carcass of ZnO-inverted opal into a multiple-mode amplified spontaneous emission band has been observed in the spectral interval of a photonic bandgap upon increasing excitation intensity. The mode structure has been assigned to amplifica...

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Bibliographic Details
Published in:Optics letters 2009-05, Vol.34 (10), p.1519-1521
Main Authors: Khunsin, Worawut, Scharrer, Michael, Aagesen, Larry K, Anderson, Mark A, Chang, Robert P H, Sotomayor Torres, Clivia M, Romanov, Sergei G
Format: Article
Language:English
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Summary:Transformation of broadband emission of oxygen defects in the carcass of ZnO-inverted opal into a multiple-mode amplified spontaneous emission band has been observed in the spectral interval of a photonic bandgap upon increasing excitation intensity. The mode structure has been assigned to amplification of emission coupled to resonance modes of the self-selected distributed Bragg resonator. The surprisingly low 2 W/cm(2) onset of amplification has been explained by the long radiative decay time of defect states populated according to the three-level excitation scheme. The decrease of emission intensity between amplified peaks has been associated with the saturation of the ZnO defect emission.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.34.001519