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We describe the microstructuring of a silicon surface to act as a spatially tunable dielectric layer. As an example, we show FDTD simulations and fabrication results of it used as an antireflective layer optimized for the terahertz region.
We have designed, fabricated, and experimentally characterized a lens for the THz regime based on artificial dielectrics. The artificial-dielectric medium is made up of a stack of 100 μm thick metal plates that form an array of parallel-plate waveguides. The convergent lens has a plano-concave geometry, in contrast to conventional dielectric lenses. The lens is capable of focusing a 2 cm diameter...
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