Ultraviolet Laser Lithography of Titania Photonic Crystals for Terahertz-Wave Modulation
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-05-18 |
| Journal | Materials |
| Authors | Soshu Kirihara, Koki Nonaka, Shoichiro Kisanuki, Hirotoshi Nozaki, Keito Sakaguchi |
| Institutions | The University of Osaka |
| Citations | 16 |
Abstract
Section titled āAbstractāThree-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 Āµm was obtained. The properties of the electromagnetic wave were measured using a THz time-domain spectrometer. In the transmission spectra for the Ī-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.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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