Fabrication of Metallodielectric Photonic Crystals with a Diamond Structure and their Microwave Properties

Abstract

Three‐dimensional (3D) metallodielectric photonic crystals with a diamond structure were fabricated in order to investigate the formation of stop bands and the absorption ability for microwaves with the dielectric absorbing media embedded into the 3D metal lattice. First, the metallic photonic crystals were prepared by filling the epoxy molds formed by stereolithography with a metal alloy having a low melting point of 70°C, followed by removal of the molds. The metallodielectric photonic crystals were then fabricated by infiltrating the porous metal crystal with a SiC/polyester mixture. The lattice constant of photonic crystals was 15 mm. The effects of different aspect ratios of diamond lattice rods, number of metallic lattice units along Γ‐L 〈1 1 1〉, Γ‐X 〈1 0 0〉, and Γ‐K 〈1 1 0〉 directions, and metallodielectric samples along the Γ‐X 〈1 0 0〉 direction on the formation of stop band and microwave absorption ability were investigated in the frequency range from 3 to 30 GHz. Metallodielectric photonic crystals formed showed good absorption ability. The measured transmission spectra of the metallic and metallodielectric crystals agreed well with the simulation of the transmission line modeling method.

Creation of 3D terahertz photonic crystals by the direct writing technique with a TiO2 sol‐gel ink

“…3D printing technique could produce complex 3D structures of various material systems with the feature size ranging from micrometers to millimeters via a layer‐by‐layer building process, which could provide a powerful alternative for the creation of 3D‐TPCs. 3D‐TPCs had been created by various 3D printing techniques, and most of them relied on ceramic powder‐based inks . Due to the inherent pressure‐induced phase separation problem of ceramic powder‐based inks during the extrusion process, it is difficult to create 3D‐TPCs with the feature sizes less than 100 μm .…”

Three‐dimensional multi‐material electromagnetic band‐gap structure: design, fabrication and property studies

“…In Figure 7, X‐axis was the wave vector k→ (indicating the direction and wavelength of the wave) and Y‐axis was the frequency. The fabricated part was measured along 〈1, 1, 0〉 direction (Chen et al , 2007; Wang et al , 2008), corresponding to G‐K area of the k→ ‐path. So we only calculated the G‐K area of the band structure which could be seen in Figure 7.…”

Meso- and Macroporous Ceramics by Phase Separation and Reactive Sintering Methods

“…There are various methods to prepare porous ceramics with highly controlled pore-structure, namely, phase separation and selective etching, 1 the sol-gel method, 2,3 reactive sintering, 4 anodic oxidation, 5 the templating method, 6-8 vacuum filtration, 9 3D computer-aided manufacturing (3D-CAM), and rapid prototyping. 10 The phase separation and selective etching method has been used for the preparation of controlled pore glasses (CPGs) and Vycor glass for some time. 11 Vycor glass is formed by the selective etching of the more soluble phase from a phase-separated borosilicate glass.…”