Broadband highly-efficient dielectric metadevices for polarization control

TL;DR

This paper presents a novel broadband dielectric metasurface design that achieves highly efficient polarization control across multiple telecom bands by utilizing a superposition of electric and magnetic multipolar modes for destructive interference.

Contribution

The study introduces a new concept based on the generalized Huygens principle to create broadband, reflectionless dielectric metasurfaces for polarization manipulation.

Findings

Achieved ~90% transmission in polarization devices

Demonstrated near 99% polarization conversion efficiency

Operates across multiple telecom bands

Abstract

Metadevices based on dielectric nanostructured surfaces with both electric and magnetic Mie-type resonances have resulted in the best efficiency to date for functional flat optics with only one disadvantage: a narrow operational bandwidth. Here we experimentally demonstrate broadband transparent all-dielectric metasurfaces for highly efficient polarization manipulation. We utilize the generalized Huygens principle, with a superposition of the scattering contributions from several electric and magnetic multipolar modes of the constituent meta-atoms, to achieve destructive interference in reflection over a large spectral bandwidth. By employing this novel concept, we demonstrate reflectionless (~90% transmission) half-wave plates, quarter-wave plates, and vector beam q-plates that can operate across multiple telecom bands with ~99% polarization conversion efficiency.