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Fabrication of Diamond Photonic Crystals with Oxide and Metallic Glasses Lattices for Terahertz Wave Control by Using Micro Pattering Stereolithography
Keywords: Photonic Crystal, Metallic Glasse, Stereolithography
Diamond lattice type photonic crystals with periodic arranged magnetic and dielectric materials can reflect the terahertz waves through Bragg diffraction. The fine diffraction lattice was fabricated successfully by using micro patterning stereolithographic methods. In this process, the photo sensitive acrylic resin paste mixed with micrometer sized metallic glass and oxide glass particles was spread on a glass substrate with 10 μm in layer thickness by using a mechanical knife edge, and cross sectional images of UV ray were exposed with 2 μm in part accuracy. The high resolution exposure could be realized by using a digital micro-mirror device. Through the layer by layer stacking, the micrometer order metallic glass and oxide glass composite structure was formed. The magnetic and dielectric composite lattices could be obtained through the dewaxing and sintering process with the lower temperature of 400 ºC under the transition point of metallic glass and above the melting point of oxide glass. The amorphous structure formation after the heat treatment was verified by a X-ray diffraction analysis. A transmission spectrum of electromagnetic wave in terahertz frequency ranges for the formed magnetic and dielectric crystals with a diamond lattice structure was measured by using a terahertz time domain spectroscopy.
Soshu Kirihara, Associate Professor
Osaka University
Ibaraki, Osaka

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