Fig. 3
From: Phase-change-driven dielectric-plasmonic transitions in chalcogenide metasurfaces
Optical properties of amorphous [dielectric] and polycrystalline [plasmonic] GST metasurfaces. a, b Measured spectral dispersion of ZnS/SiO2–GST–ZnS/SiO2 nanograting metasurface TM transmission for a selection of grating periods, P [as labeled], for the amorphous (a) and polycrystalline (b) states of the GST layer overlaid with spectra for the unstructured tri-layer [dashed lines]. Corresponding numerically simulated transmission spectra (c, d). Distributions of the normalized magnetic field, H, in the xz-plane for a unit cell of a P = 400 nm nanograting (e, f) for a transmission resonance wavelength at λ = 580 nm for amorphous and 690 nm for the crystalline phase
