Abstract
In this paper, an electrically tunable metasuface is designed for visible regime. The device mainly consists of a V-shaped metallic metasurface, an ITO film, an electro-optic (EO) dielectric and a metal layer fabricated on a silica substrate. A continuous electrical modulation of resonant wavelength has been theoretically demonstrated in the visible range from 555 nm to 640 nm by changing the voltage applied on the EO dielectric from −20 V to 20 V. During the modulation, the steering angle also changes with the selective color. The peak cross-polarized reflectivity is higher than 48% and the bandwidth is narrower than 60 nm. The resonant wavelength shift can be explained by that the refractive index variation of the EO material induces resonance condition changes of the gap surface plasmon (GSP). The results provide a novel design solution for active plasmonic devices, especially for dynamic metadevices.
Highlights
Since the functionality of the conventional antennas is fixed after fabrication, explorations in electrically tunable metasurfaces have profound significance
The changes of the reflection angle satisfy the generalized Snell’s law (Eq 2). These results demonstrate that our design realizes an effective electric modulation on the anomalous reflective wavelength of the gradient metasurface
This design can be possibly used in color display and holographic imaging
Summary
An electrically tunable metasuface is designed for visible regime. The device mainly consists of a V-shaped metallic metasurface, an ITO film, an electro-optic (EO) dielectric and a metal layer fabricated on a silica substrate. Related researches have been reported utilizing liquid crystals[12,13,14,15], graphene[16,17], metal-doped or pure metallic dioxide assembled with indium tin oxide (ITO)[18,19,20,21,22], vanadium dioxide (VO2)[23], ion-attracting plasmonic crystal[24] and so on These trials mainly focus on the phase or amplitude modulation in the infrared frequency and suffer from broad spectral bandwidth and low efficiency. The cross-polarized resonance reflective wavelength can be tuned theoretically from 555 nm to 640 nm by changing the voltage applied to the EO material from −20 V to 20 V We hope this design could be applied in dynamic meta-display and hologram
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