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Photonic metamaterials by direct laser writing and silver chemical vapour deposition

2008; Nature Portfolio; Volume: 7; Issue: 7 Linguagem: Inglês

10.1038/nmat2197

1476-4660

Michael Stefan Rill, Christine Plet, Michael Thiel, Isabelle Staude, Georg von Freymann, Stefan Lindén, Martin Wegener,

Photonic and Optical Devices

Metamaterials are artificial materials that--unlike natural substances--enable magnetism to be achieved at optical frequencies. The vast majority of photonic metamaterials has been fabricated by electron-beam lithography and evaporation of metal films, both of which are well-established two-dimensional (2D) technologies. Although stacking of three or four functional layers made using these methods has been reported, a truly 3D fabrication approach would be preferable for 3D photonic metamaterials. Here, we report first steps in this direction by using a combination of direct laser writing and silver chemical vapour deposition--the 3D analogues of electron-beam lithography and evaporation, respectively. The optical characterization of a planar test structure composed of elongated split-ring resonators is in good agreement with theory. Retrieval of the effective optical parameters reveals the importance of bi-anisotropy. Once suitable theoretical blueprints are available, our fabrication approach will enable rapid prototyping of truly 3D photonic metamaterials.