Abstract
Artificial dielectrics are man-made media that mimic the properties of naturally occurring dielectric media, or even manifest properties that cannot generally occur in nature. The concept of an artificial dielectric dates back to the 1940s when it was introduced by the microwave community, although the idea never gained popularity. However, the wavelength scaling that results when transitioning from microwaves to THz waves gives new meaning to this concept, as evidenced by the recent demonstrations of high-performance, energy-efficient, low-cost, and versatile THz devices. Here, we will review some of these devices, expanding on both the homogeneous and inhomogeneous versions.
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