volume | PIER Journals

Abstract

Metagratings, consisting of subwavelength-aperture arrays (SAAs), provide a powerful platform to manipulate electromagnetic waves. Typical examples include extraordinary optic transmission (EOT) in the far field, and field enhancements (FEs) in the near field. These capabilities promise applications in beam steering and wave-matter interactions, but are not extended to broad bandwidth simultaneously. Here, we transplant the concept of broadband light harvesting devices from optic to terahertz frequency and by exploring one-dimensional arrays of spirally textured metallic cylinders supporting multiple designer localized surface plasmon resonances. Theoretical analysis reveals that the interaction between localized plasmons leads to the broadband THz EOTs in the far field as well as large field enhancements in the near field. The bandwidth of the EOT and the magnitude of field enhancements can be flexibly designed by changing the geometry of the plasmonic-like resonators. This design promises applications in THz broadband beam-steering, absorbers, and sensing, topological devices.

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Dr. Chi Wang

Professor Shurun Tan

Dr. Xiao Lin

Professor Hongsheng Chen

Prof. Fei Gao