Abstract
The advent of low-loss dielectric metasurfaces offers a paradigm of miniaturization for free-space optical elements like lenses and deflectors, but these are limited to static functionality. This study illustrates the possibility to tune the focal length of a metalens through spatially uniform modulation of refractive index. Using traditional thermo-optic effects, the authors demonstrate large refractive index changes ($\mathrm{\ensuremath{\Delta}}\phantom{\rule{0}{0ex}}n$ = 0.15) in InSb Mie resonators. They furthermore show how to form a metasurface from a single material, enabling easier wafer-scale production.
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