Chiral Metamaterials by Shadowing Deposition

Abstract

[evdate 2012-10-04] Croucher Advanced Study Institute on New Materials and New Concepts for Controlling Light and Waves. Talk no.12 Host: HKUST Institute for Advanced Study.

Sponsor: The Croucher Foundation.

Abstract: We report the fabrication of chiral metamaterials using a simple shadowing vapor deposition technique. A template consisting of columnar arrays is used as the substrate for the deposition such that only unshielded/exposed areas are coated. The degree of shielding/shadowing among the arrays, and hence the chirality, can be controlled by adjusting the deposition angle with respective to the arrays. Using this technique we have fabricated 3D metallic chiral metamaterials in the optical range exhibiting very large circular dichroism for circularly polarized incidence light. The shadowing technique is very promising because it is simple, inexpensive, and more importantly, can be applied to the production of large sample size chiral metamaterials.

Duration: 24 min.