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Open AccessArticle

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

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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