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(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.
(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.
(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.
(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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