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Resonance amplification of defect emission in ZnO-inverted opal

Worawut Khunsin, Michael Scharrer, Larry K. Aagesen, Mark A. Anderson, Robert P.H. Chang, Clivia M. Sotomayor Torres, and Sergei G. Romanov

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Abstract

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∕cm2 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.

© 2009 Optical Society of America

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