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Reflectivity reduction and absorptivity enhancement of a semiconductor (Ge) antenna meta-surface. (a) Dispersion relations of TM0 (blue lines) and TM1 (green lines) modes of an infinitely long Ge nanowire (cross section: ). Red dashed line: the light line . Color-coded insets: for the TM0/TM1 modes. Upper middle inset: schematic of a double-pass array with a reflective ground plate. Simulated reflection (blue) and single/double-pass absorption (red) for (b) 2D and (c) 3D antennas.
Large-area SiC antenna meta-surfaces. (a) Scanning electron micrographs of the 6-μm-pitch antenna array and a single SiC antenna. (b) SiC permittivity, with shaded. (c) Physical dimensions of the SiC antenna arrays. (d) Illumination schematics for s-polarized E-field aligned parallel ( ) and perpendicular ( ) to the long axis.
Spectral properties of large-area meta-surfaces based on SiC antennas. ((a) and (b)) Reflection and ((c) and (d)) absorption spectra. (a) and (c) Experiments are compared to ((b) and (d)) theory. Resonance peaks are labeled in (d) according to the prevailing nature of the resonant mode. TM-dominant modes correspond to polarization, and TE-dominant modes to . Surface modes contribute to both polarizations. (e) Unpolarized thermal emission (schematic in (f)) from the array is compared to polarization-averaged absorption (data from (c)).
Theoretical interpretation of SiC meta-surface resonances. Real (solid lines) and complex (dashed lines) components of the constitutive parameters of the meta-surface for polarization in plasmonic spectral region: (a) permittivity ϵ and (b) permeability μ. (c) and (d) ϵ and μ for polarization in the high-index dielectric spectral region. (e) Resonant modes with polarization. Color: , yellow arrows: E. (f) Modes with polarization. Color: , red arrows: H.
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