Emission stimulation in a directional band gap of a CdTe-loaded opal photonic crystal.
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.
Romanov
S G
SG
Institute of Materials Science and Department of Electrical and Information Engineering, University of Wuppertal, Gauss-strasse 20, 42097 Wuppertal, Germany.
Chigrin
D N
DN
Sotomayor Torres
C M
CM
Gaponik
N
N
Eychmüller
A
A
Rogach
A L
AL