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Materials 2018, 11(5), 835; https://doi.org/10.3390/ma11050835

Ultraviolet Laser Lithography of Titania Photonic Crystals for Terahertz-Wave Modulation

1
Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka Ibaraki, Osaka 567-0047, Japan
2
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka Suita, Osaka 565-0871, Japan
*
Author to whom correspondence should be addressed.
Received: 2 May 2018 / Revised: 15 May 2018 / Accepted: 16 May 2018 / Published: 18 May 2018
(This article belongs to the Special Issue Photonic Crystals for Chemical Sensing and Biosensing)
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Abstract

Three-dimensional (3D) microphotonic crystals with a diamond structure composed of titania microlattices were fabricated using ultraviolet laser lithography, and the bandgap properties in the terahertz (THz) electromagnetic-wave frequency region were investigated. An acrylic resin paste with titania fine particle dispersions was used as the raw material for additive manufacturing. By scanning a spread paste surface with an ultraviolet laser beam, two-dimensional solid patterns were dewaxed and sintered. Subsequently, 3D structures with a relative density of 97% were created via layer lamination and joining. A titania diamond lattice with a lattice constant density of 240 µm was obtained. The properties of the electromagnetic wave were measured using a THz time-domain spectrometer. In the transmission spectra for the Γ-X <100> direction, a forbidden band was observed from 0.26 THz to 0.44 THz. The frequency range of the bandgap agreed well with calculated results obtained using the plane–wave expansion method. Additionally, results of a simulation via transmission-line modeling indicated that a localized mode can be obtained by introducing a plane defect between twinned diamond lattice structures. View Full-Text
Keywords: photonic crystal; terahertz wave modulation; additive manufacturing; ultraviolet laser lithography; titanium dioxide; nanoparticles paste photonic crystal; terahertz wave modulation; additive manufacturing; ultraviolet laser lithography; titanium dioxide; nanoparticles paste
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kirihara, S.; Nonaka, K.; Kisanuki, S.; Nozaki, H.; Sakaguchi, K. Ultraviolet Laser Lithography of Titania Photonic Crystals for Terahertz-Wave Modulation. Materials 2018, 11, 835.

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