title: Resonance amplification of defect emission in ZnO-inverted opal.
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/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.
authors.affiliation: Tyndall National Institute, University College Cork, Lee Maltings, Cork, Ireland.
authors.forename: Worawut
authors.initials: W
authors.lastname: Khunsin
authors.forename: Michael
authors.initials: M
authors.lastname: Scharrer
authors.forename: Larry K
authors.initials: LK
authors.lastname: Aagesen
authors.forename: Mark A
authors.initials: MA
authors.lastname: Anderson
authors.forename: Robert P H
authors.initials: RP
authors.lastname: Chang
authors.forename: Clivia M
authors.initials: CM
authors.lastname: Sotomayor Torres
authors.forename: Sergei G
authors.initials: SG
authors.lastname: Romanov