title: Emission stimulation in a directional band gap of a CdTe-loaded opal photonic crystal.
abstract: An anisotropic photonic crystal light source has been realized by impregnation of a thin film latex opal with brightly luminescent CdTe nanocrystals. Its photoluminescence along a given direction has been studied as a function of excitation power. An increase of the photoluminescence saturation threshold in the directional photonic band gap has been observed. This result is interpreted as a stimulation of emission coupled to specific eigenmodes of a directional band gap. A theoretical model exploiting the low group velocity eigenmodes has been elaborated to explain the resonance character of the emission with band gap frequencies.
authors.affiliation: Institute of Materials Science and Department of Electrical and Information Engineering, University of Wuppertal, Gauss-strasse 20, 42097 Wuppertal, Germany.
authors.forename: S G
authors.initials: SG
authors.lastname: Romanov
authors.forename: D N
authors.initials: DN
authors.lastname: Chigrin
authors.forename: C M
authors.initials: CM
authors.lastname: Sotomayor Torres
authors.forename: N
authors.initials: N
authors.lastname: Gaponik
authors.forename: A
authors.initials: A
authors.lastname: Eychmüller
authors.forename: A L
authors.initials: AL
authors.lastname: Rogach