Metamaterials are new artificial materials with unusual electromagnetic properties that are not found in naturally occurring materials. A space-time metamaterial (STM) is a material whose properties varies in both space and time. Conventional pure-space electromagnetic metamaterials offer unprecedented opportunities for controlling waves from their general 36 bianisotropic parameters. The addition of time variation in STM brings about an extra level of diversity and a fundamental generalization of pure-space bianisotropic metamaterials by transforming the complete space-time spectrum of waves.
We see many potential applications like frequency multiplication and mixing, matching and filtering using time-varying microwave and mm-wave circuit components, magnetless devices: isolators, circulators, mixers; nonreciprocity and absorption, electromagnetic cloaking; electromagnetic processing and radiation, e.g., non-reciprocal active antennas.