Terahertz active spatial filtering through optically tunable hyperbolic metamaterials
Optics
2015-06-05 v1
Abstract
We theoretically consider infrared-driven hyperbolic metamaterials able to spatially filtering terahertz radiation. The metamaterial is a slab made of alternating semiconductor and dielectric layers whose homogenized uniaxial response, at terahertz frequencies, shows principal permittivities of different signs. The gap provided by metamaterial hyperbolic dispersion allows the slab to stop spatial frequencies within a bandwidth tunable by changing the infrared radiation intensity. We numerically prove the device functionality by resorting to full wave simulation coupled to the dynamics of charge carries photoexcited by infrared radiation in semiconductor layers.
Keywords
Cite
@article{arxiv.1205.6708,
title = {Terahertz active spatial filtering through optically tunable hyperbolic metamaterials},
author = {Carlo Rizza and Alessandro Ciattoni and Elisa Spinozzi and Lorenzo Columbo},
journal= {arXiv preprint arXiv:1205.6708},
year = {2015}
}
Comments
3 pages, 4 figures. Submitted for publication on Applied Physics Letters