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Fabrication of Terahertz Wave Resonators of Twinned Photonic Crystals with Alumina Diamond Lattices by Using Micro-Stereolithography
Keywords: Photonic Crystal, Terahertz Waves, Micro-stereolithography
Photonic crystals have periodically arranged structures of dielectric medium, and form forbidden bands to reflect electromagnetic waves by Bragg diffraction. In this investigation, twinned photonic crystals with mirror symmetric diamond lattices were fabricated by using micro-stereolithography. Through CAD/CAM processes, micrometer order alumina lattices were processed successfully to resonate and localize terahertz waves effectively. Diamond lattice patterns of 500 E in a lattice constant were designed, and twinned structures parallel to (100) and (111) planes were introduced. Photo sensitive liquid resins including nano-sized alumina particles at 40 % in volume fraction were spread on glass substrates, and cross sectional UV images were exposed with 2 m in part accuracy. Through layer stacking processes, alumina dispersed resin lattices were formed automatically. These precursors were dewaxed at 600 C for 2 hs and sintered at 1500 C for 2 hs. Subsequently, the electromagnetic wave transmissions were measured by using a terahertz time domain spectroscopy. In measured results, the forbidden bands were formed through the wave diffractions, and localized modes of transmission peaks were observed in the band gaps. At these peak frequencies, electric field intensities were calculated by using a transmission line modeling method. In the calculated profiles, incident waves were resonated and localized strongly by multiple reflections between the mirror symmetric lattice patterns. The stronger localized mode was obtained between the twinned lattices parallel to (111) planes comparing with the case of (100). These results indicated that modifications of the twinning structures can improve the localization efficiency in the terahertz wave range.
Toshiki Niki, Student
Osaka University
Ibaraki, Osaka 567-0047,
Japan


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