Abstract
Dielectric nanoantenna-based metasurfaces have attracted wide attention for their outstanding performance in light manipulation with low loss and full phase coverage enabled by multipolar resonances. To make the metasurfaces actively tunable, we adopt a kind of phase-changing material Ge2Sb2Te5 to construct non-volatile, switchable antenna-based metasurfaces in the mid-infrared spectrum region. Our design of the metasurface can realize switching between electric and magnetic dipole resonances across a broad spectrum region through crystalline-amorphous phase transitions under fixed design. Moreover, the transmission switching contrast between different phases can be up to 30dB (-30dB), due to the shift of multipolar resonances. This reconfigurable antenna-based metasurface will pave the way for ultimate design of light modulators, deflectors, holograms and so on for future optical communication networks.
Highlights
IntroductionMetasurfaces consisting of two-dimensional arrangement of meta-atoms are hoped-for flat and compact devices to locally manipulate amplitude, phase and polarization of incident light [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]
The total scattering cross section of a GST disk is decomposed into the contributions from an electric dipole (ED), a magnetic dipole (MD), an electric quadrupole (EQ) and a magnetic quadrupole (MQ)
Higher orders of multipolar resonances can be neglected in the spectrum region for different phases
Summary
Metasurfaces consisting of two-dimensional arrangement of meta-atoms are hoped-for flat and compact devices to locally manipulate amplitude, phase and polarization of incident light [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]. To further increase the degrees of freedom for light manipulation, there is an urgent need for developing active all-dielectric antenna-based metasurfaces to include a wealth of dynamic, such as switchable, tunable or reconfigurable functionalities, which is usually achieved by applying heat, electrostatic and magnetic forces, and stretching to the metasurface
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