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Three-dimensional metallic photonic crystals fabricated by soft lithography for midinfrared applications
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) A schematic procedure for fabrication of a four-layer freestanding metallic photonic crystals. (a) A polymer structure on a substrate coated with a water-soluble layer. (b) A rigid metal frame is attached around the polymer structure. (c) The polymer structure is separated from the substrate by dissolving the water-soluble layer. (d) The freestanding polymer structure is converted to a metallic structure by the sputter coating of gold.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Reflectance and (b) transmittance spectra of a four-layer freestanding structure are characterized with increasing thickness of gold. (c) Absorption spectrum of a homogeneous thin film of the structural polymer J-91 is presented.

Image of FIG. 3.
FIG. 3.

(Color online) Top-view SEM micrographs of (a) tetragonal and (b) face-centered-tetragonal domains in a freestanding gold-coated four-layer structure are shown with corresponding schematics. Moiré fringes in (c) a transmission optical image show the domains of the four-layer structure. (d) Well-covered gold layers are shown in the cross section of a four-layer structure.

Image of FIG. 4.
FIG. 4.

(Color online) Reflectance and transmittance spectra of tetragonal and FCT structures as increasing the number of layers are shown with results of numerical calculations for four-layer metallic structures.


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Scitation: Three-dimensional metallic photonic crystals fabricated by soft lithography for midinfrared applications