Nonlinear dielectric optomechanical metamaterials. Spectrally selective chiral silicon metasurfaces based on infrared Fano resonances. Broadband light bending with plasmonic nanoantennas. High-efficiency broadband anomalous reflection by gradient meta-surfaces. Light propagation with phase discontinuities: generalized laws of reflection and refraction. Optical manifestations of planar chirality. We combine germanium–antimony–tellurium-based films with a diffraction-limited resolution optical writing process to demonstrate a variety of devices: visible-range reconfigurable bichromatic and multi-focus Fresnel zone plates, a super-oscillatory lens with subwavelength focus, a greyscale hologram, and a dielectric metamaterial with on-demand reflection and transmission resonances. Such components are written, erased and rewritten as two-dimensional binary or greyscale patterns into a nanoscale film of phase-change material by inducing a refractive-index-changing phase transition with tailored trains of femtosecond pulses. Here, we report a novel approach for making reconfigurable optical components that are created with light in a non-volatile and reversible fashion. Tuning of such components is conventionally achieved by either micro- or nanomechanical actuation of their constituent parts, by stretching or by heating. Photonic components with adjustable parameters, such as variable-focal-length lenses or spectral filters, which can change functionality upon optical stimulation, could offer numerous useful applications.
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