Abstract

Optical metasurfaces have revolutionised the ability to control and manipulate EM fields. By carefully designing a 2D array of sub-wavelength nanoresonators, often referred to as meta-atoms, the light-matter interactions can be engineered to precisely control the scattering properties of the incident field [1]. Control over the light propagation has led to the demonstration of novel optical devices including ultrathin filters, lenses, displays and sensors. For the vast majority of fabricated metasurfaces, the constituent meta-atoms are designed for a specific application and cannot be manipulated after fabrication. The realisation of efficient, tuneable metasurfaces, in response to external stimuli, will advance the wider application of optical metasurfaces as optical switches, dynamic displays and arbitrary wavefront manipulators [2]. Most reports of tuneable metasurfaces to date employ a single electric, optical, mechanical, thermal or chemical stimulus to tune the optical responance. Here we show that combinations of stimuli can produce dynamic tuning of the optical resonances of the fabricated metasurfaces.

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