Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 63: Photonics IV

Q 63.8: Vortrag

Freitag, 22. März 2013, 15:45–16:00, F 128

3D Photonic Crystals from Rolled Membranes — •Silvia Giudicatti, Matthew R. Jorgensen, and Oliver G. Schmidt — Institute for Integrative Nanosciences, IFW-Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany

Photonic crystals are periodically patterned dielectric materials which allow the control of light thanks to forbidden frequencies ranges (photonic band gaps). Their properties make them interesting candidates for a large number of applications, such as the control of spontaneous emission for light amplification, lasing, quantum information, photovoltaics and photocatalysis. In particular, 3D photonic crystals promise to offer unprecedented opportunities. However, their fabrication requires sophisticated methods that mainly allow the preparation of devices suitable for applications in the near infrared and longer wavelengths. Regarding visible frequencies, examples are limited to partial band gap materials and those templated from biological samples.

We propose 3D photonic crystals achieved by applying rolled-up technology to pre-patterned 2D membranes. A combined control of the structural parameters such as the membrane thickness and composition, the geometry of the 2D lattice and the rolling direction makes a variety of crystal families accessible. Among them, the diamond structure can also be obtained. A theoretical investigation has been carried out to identify the structural parameters resulting in the best band gap. The effects of the finite size as well as the bending have been also considered. The results of the theoretical analysis will be presented together with some preliminary tests for the system fabrication.