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(a) of delocalized SPPs vs frequency for (a) lossless metal and (b) gold. The singularity near wavelength due to the plasmonic bandgap structure [derived from Fig. 2(d)] is also shown. The insets depict the dispersion curves of the delocalized SPPs within the metallic substrate/air interface where the dashed line denotes the light line. A magnified area of the van Hove singularity in plasmonic bandgap structure is shown in the inset near wavelength.
(a) Schematic representation of the metallic grating. Calculated emissivity of a metallic gold grating, with period , fill factor , and , as a function of (b) observation angle and (c) wavelength. (d) Experimental (squares) and calculated (solid line) dispersion curves of the metallic grating . Dashed red line indicates the Rayleigh anomaly.
Calculated emissiviy (black line), normalized gap size (dashed dotted red line), and normalized coherence length (blue line) as a function of . The gap is normalized to the emission frequency and the coherence length is normalized to the delocalized surface wave coherence length. Blue dashed line is calculated as , where is the proportionality constant and PBG is the photonic bandgap size.
(a) Atomic force microscope image of the realized grating, (b) measured emissivity as a function of the wavelength for and 0.14°, and (c) emissivity (solid line) vs observation angle, as extracted from the measured emissivity (open circles). The dashed line indicates an integrated emissivity obtained by a convolution analysis between the emissivity and a simulated slit of .
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