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Coexisting localized and extended optical Bloch states in a periodic deep wire array microcavity

: Löchner, F.J.F.; Mischok, A.; Brückner, R.; Lyssenko, V.G.; Zakhidov, A.A.; Fröb, H.; Leo, K.


Superlattices and Microstructures 85 (2015), pp.646-652
ISSN: 0749-6036
ISSN: 1096-3677
Journal Article
Fraunhofer FEP ()

We embed periodic SiO2 wires in an organic microcavity, producing a rectangular potential by the different optical thicknesses of the active layer due to the additional SiO2 layer. By μμ-photoluminescence spectroscopy, we observe the energy dispersion of the photons and obtain discrete localized below and extended Bloch states above the potential barrier, respectively, showing that electro-magnetic waves can behave like massive particles, such as electrons, in crystal lattices. We investigate the dependencies on wire width and period and use the Kronig–Penney model to describe the photon energy dispersion, including an “effective mass” of a photon propagating through a microcavity implying polarization splitting. We obtain excellent agreement between experiment, simulation and analytical calculation.