| Institut(e): |
Institut für Physikalische Chemie der Universität Hamburg Photonics and Optoelectronics Group, Department of Physics and Center for NanoScience (CeNS) , University of Munich Amalienstr. 54D-80799 Munich Germany Tel.: +49-89-2180-1418 Fax: +49-89-2180-3441 |
|
| Projektleiter: | Dr. Andrey Rogach | andrey.rogach@physik.uni-muenchen.de |
| PD Dr. Alexander Eychmüller | eychmuel@chemie.uni-hamburg.de | |
| Sekretariat: | +49-89-2180-3318 | |
| Mitarbeiter: | Dr. Nikolai Gaponik | gaponik@chemie.uni-hamburg.de |
| Abstract: Three-dimensional photonic crystals from monodisperse colloidal spheres (latex or silica), also called artificial opals, will be prepared as films on transparent substrates. Self-organization of the spheres by sedimentation and electrophoretic deposition will be the main fabrication techniques. The photonic crystals will be impregnated with luminescing semiconductor nanocrystals, the luminescence band of which overlap the photonic bandgap of the opals. Strongly luminescing nanocrystals of CdSe und CdTe (luminescence in the spectral range 500-700 nm), InP (luminescence in the spectral range 600-1100 nm), CdHgTe (luminescence in the spectral range 700-1000 nm), and HgTe (luminescence in the spectral range 900-1800 nm) will be prepared in colloidal solutions using wet chemical techniques. The groups of Dr. Wehrspohn at the MPI für Mikrostrukturphysik in Halle will receive HgTe nanocrystals emitting at 1.3 and 1.5 µm (telecommunication windows) for impregnation of two-dimensional (Halle) photonic crystals produced there. In cooperation with the groups of Dr. Caruso und Dr. Sukhorukov from the MPI für Kolloid- und Grenzflächenforschung in Potsdam we will prepare monodisperse colloidal core-shell spheres. They will be formed from a latex or a SiO2 core surrounded by a shell consisting of either luminescing semiconductor nanocrystals or nanosized metal (mainly Ag) particles or a combination of both. These complex structures will also be used for the fabrication of three- dimensional photonic crystals. A subsequent activity will be the preparation of photonic heterostructures consisting of two or more layers. The layers will be made from latex or silica spheres of different sizes (or their inverse replicas) and/or different structures (different kinds of core-shell spheres or SiO2 spheres doped with semiconductor nanocrystals). Besides the investigations in our laboratory the optical properties of the photonic heterostructures will also be investigated in cooperation with Prof. Sotomayor Torres from the University of Wuppertal. The characterization of the above mentioned samples will be carried out using optical (transmission, reflection and luminescence spectroscopy and confocal microscopy) and structural (scanning electron microscopy and high resolution transmission electron microscopy) techniques Cooperations within the SPP |
||
| |
||
Zurück/Back |
||