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Highly coherent thermal emission obtained by plasmonic bandgap structures
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View: Figures


Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

(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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Highly coherent thermal emission obtained by plasmonic bandgap structures