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Materials Tectonics by Structural Joinings: Fabrication of Ceramics Micro Patterns with Dielectric Polygon Tablets for Terahertz Wave Resonations by Using Stereolithography
Keywords: Micro Patterning, Terahertz Wave, Micro Stereolithography
Materials tectonics is new concept to control energy flows form environmental field to human beings through spatial patterns of ceramics or metals fabricated by using structural joinings. Recently, we have developed two dimensional micro patterns composed of dielectric ceramics in order to control terahertz waves effectively by using stereolithography. In this process, photosensitive resin pastes with titania particles dispersion were spread on a glass substrate with 10 m in layer thickness by moving a knife edge, and two-dimensional images of UV ray were exposed by using DMD (Digital Micro-mirror Device) with 2 m in part accuracy. Through the layer by layer stacking, periodic structures composed of micro polygon tablets were formed. Dielectric constant of these tablets was measured as 40. Subsequently, the electromagnetic wave properties of these samples were measured by using a terahertz spectroscopic device. In transmission spectra, forbidden bands were observed form 0.4 to 0.6 THz through electromagnetic wave diffractions. Moreover, localized modes of standing waves were formed at higher and lower frequency edges of band gaps in TLM (Transmission Line Modeling) simulations. At these frequencies, electromagnetic energies were concentrated strongly into the thin micro patterns. The terahertz waves are well known to resonate with various types of protein molecules, and expected to control the biological material syntheses through the frequency excitements. The fabricated ceramic micro patterns are considered to be applied for the new types of reactors to create the useful materials as artificial interfaces between the electromagnetic energy and the biological materials.
Soshu Kirihara, Associate Professor
Osaka University
Ibaraki, Osaka 567-0047,

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