Materials with on-demand refractive indices in the terahertz range.

@article{Kadlec2008MaterialsWO,
  title={Materials with on-demand refractive indices in the terahertz range.},
  author={Christelle Philippe Kadlec and Filip Kadlec and Petr Kuzel and Karine Blary and Patrick Mounaix},
  journal={Optics letters},
  year={2008},
  volume={33 19},
  pages={
          2275-7
        }
}
We demonstrate the possibility to create materials with chosen refractive indices and a strong birefringence in the terahertz range by etching of patterns with appropriate filling factors in a dielectric substrate. We show that by using deep inductive plasma etching of silicon wafers, it is possible to achieve a birefringence as high as 1.2 in an 80 microm thick layer. The resulting stacks were used as building blocks for a photonic crystal displaying sharp defect mode peaks in transmittance. 
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