Self-assembled optical metamaterials
Event details
| Date | 22.05.2015 |
| Hour | 14:15 |
| Speaker |
Prof. Ullrich Steiner, Adolphe Merkle Institute, Fribourg, Suisse Homepage |
| Location | |
| Category | Conferences - Seminars |
Ordered mesoporous structures made from plasmonic metals have recently attracted great attention because of the possibility to manufacture optical materials that exhibit a negative refractive index. These optical metamaterials intrinsically focus light beyond the diffraction limit and are able to coherently guide light around objects, “cloaking” them. The challenge is however to manufacture well-defined materials with sufficiently small periodicities that act as 3D metamaterials for visible light.
In my talk, I will introduce a methodology that employs the self-assmbly of block-copolymer for the manufacture of optical metamaterials. We target in particular the gyroid morphology, which has three chiral axes, because structurally chiral materials are predicted to feature a negative refractive index. We have investigated the replication of self-assembled polymer morphologies into gold and silver and have studied their optical properties. The replicated gyroid morphology exhibits high transparency arising form the propagation of strongly anisotropic plasmon modes that give rise to both linear and circular dichroism across the visible region.
In my talk, I will introduce a methodology that employs the self-assmbly of block-copolymer for the manufacture of optical metamaterials. We target in particular the gyroid morphology, which has three chiral axes, because structurally chiral materials are predicted to feature a negative refractive index. We have investigated the replication of self-assembled polymer morphologies into gold and silver and have studied their optical properties. The replicated gyroid morphology exhibits high transparency arising form the propagation of strongly anisotropic plasmon modes that give rise to both linear and circular dichroism across the visible region.
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez and Raphaël Butté)