Abstract
We investigate THz metamaterial resonators which provide highly subwavelength confinement of the electromagnetic field. In these structures the capacitive part is reduced into nano-scale dimensions and allows strong local electric field enhancement, useful for infrared detectors and sensors. A crucial issue for these structures is the fraction of the incident THz radiation that couples into the capacitive part of the metamaterial. To this end we develop a strategy to enhance the harvesting of the incoming free space radiation into volumes as small as 5x10−8λ3 for a free space wavelength λ. We also provide an analytical model in order to evaluate propagation effects in the inductive part of the structures.
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