Dielectric gradient metasurface optical elements

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Probabilistic Representation and Inverse Design of Metamaterials Based on a Deep Generative Model with Semi‐Supervised Learning Strategy (2019, background): “Some other designs guided by physical intuition include ring-like structures that exhibit strong magnetic resonances induced by the incident magnetic field [6, 16, 17], dielectric building blocks that can induce both electric and magnetic resonances leading to better control of the phase of the scat”
Metasurface optics for full-color computational imaging (2018, background): “licon nitride nanoposts of thickness 633 nm on top of a silicon dioxide substrate (Figure 1A-B) positioned on a square lattice with a period of 400 nm. Our choice of nanoposts, as opposed to nanofins (10, 19) or V-shaped antennas (5), enables polarization-independent behavior, while the high bandgap”