Macroscopic Magneto-Chiroptical Metasurfaces

TL;DR

This paper introduces macroscale magnetophotonic metasurfaces with chiral nanoantennas that exhibit large circular dichroism and magneto-optical effects, enabling advanced nanophotonic applications and sensors.

Contribution

It presents the design and analysis of macroscopic enantiomeric magnetophotonic metasurfaces combining plasmonic and ferromagnetic antennas for enhanced chiroptical responses.

Findings

Large circular dichroism observed in metasurfaces.

Identification of reciprocal and non-reciprocal contributions.

Potential for high-sensitivity chiral sensing and novel optical devices.

Abstract

Nanophotonic chiral antennas exhibit orders of magnitude higher circular dichroism (CD) compared to molecular systems. Merging magnetism and structural chirality at the nanometric level allows for the efficient magnetic control of the dichroic response, bringing exciting new prospects to active nanophotonic devices and magnetochirality. Here we devise macroscale enantiomeric magnetophotonic metasurfaces of plasmon and ferromagnetic spiral antennas. Mixed 2D- and 3D- chiral nanoantennas induce large CD response, where we identify reciprocal and non-reciprocal contributions. The simultaneous chiroptical and magneto-optical response in a wide spectral range with these metasurfaces delivers an attractive platform for the study of magnetochirality at the nanoscale. Exploring further this type of magnetophotonic metasurfaces allows the realization of high-sensitivity chiral sensors and prompts the design of novel macroscopic optical devices operating with polarized light.