Extra high-Q resonances and extraordinary transparency in finite fragments of dielectric metasurfaces: Prospects for 5G applications

Document Type

Article

Publication Date

7-13-2021

Department

Department of Electrical and Computer Engineering

Abstract

We investigate the effects of fragmenting metasurfaces (MSs), composed of dielectric disks, on their electromagnetic responses and show that the presence of four abrupt boundaries between finite size structures and free space leads to the formation of new resonance modes. In addition to the characteristic for infinite metasurfaces modes with identical dipolar resonances formed in all unit cells, fragmented metasurfaces can exhibit out-of-phase electric and magnetic responses in neighboring “meta-atoms.” While in-phase responses correspond to field patterns representative for even resonance modes, out-of-phase responses produce a variety of patterns typical for odd resonance modes. These modes are formed as the result of partial reflections of surface waves from boundaries between MS fragments and free space, and their respective responses demonstrate extremely high intensities and Q-factors. Enabled by new responses, a significantly localized wave/matter interaction can be used for enhancing the performance of sensors and absorbers of 5G systems. In addition, we report the detection of extraordinary narrow-band transmission at electric and magnetic dipolar resonances in fragmented MSs that can be used to locally enhance mm-wave signals for 5G communications. As a proof of concept, transmission through a 5 × 5 MS fragment has been experimentally confirmed in the X-band of microwave spectrum.

Publication Title

Applied Physics Letters

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