Journal ArticleDOI
Terahertz Wave Control Using Ceramic Photonic Crystals with a Diamond Structure Including Plane Defects Fabricated by Microstereolithography
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TLDR
In this paper, the fabrication and terahertz wave properties of alumina microphotonic crystals with a diamond structure were investigated, and a complete photonic band gap was observed from 0.40 to 0.47 THz and showed good agreement with the simulation of a plane wave expansion method.Abstract:
The fabrication and terahertz wave properties of alumina microphotonic crystals with a diamond structure were investigated. Acrylic diamond structures with alumina particles' dispersion were formed using microstereolithography. Fabricated precursors were dewaxed and sintered in air. The electromagnetic wave properties were measured by terahertz time-domain spectroscopy. A complete photonic band gap was observed from 0.40 to 0.47 THz, and showed good agreement with the simulation of a plane wave expansion method. Moreover, a localized mode was observed by introducing a plane defect between twinned diamond structures. The localized mode was analyzed using transmission line modeling simulation.read more
Citations
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Journal ArticleDOI
Dielectric Properties of Low-Loss Polymers for mmW and THz Applications
TL;DR: In this article, the authors presented a systematic characterization of dielectric permittivity of 6 commonly used, low-loss polymers namely polystyrene, parylene, polyimide, SLA resin, SU-8, and SUEX for the 100-GHz to 2-THz bands using transmission mode time domain spectroscopy.
Journal ArticleDOI
Three‐Dimensional Stereolithography of Alumina Photonic Crystals for Terahertz Wave Localization
Soshu Kirihara,Toshiki Niki +1 more
TL;DR: Using stereolithography as an additive manufacturing (AM) process, photonic crystals with a diamond-like structure composed of alumina microlattices were fabricated and their electromagnetic band gap profiles, in terahertz frequency ranges, were investigated as mentioned in this paper.
Journal ArticleDOI
Unit cell estimation of volumetrically-varying permittivity in additively-manufactured ceramic lattices with X-ray computed tomography
Edward Burden,Yongduk Oh,Bhargavi Mummareddy,Dylan Negro,Pedro Luiz Côrtes,Anton du Plessis,Eric MacDonald,Jacob J. Adams,Frank X. Li,Roberto G. Rojas +9 more
TL;DR: In this paper, a 3D data structure with a pointwise unit cell estimation of the effective permittivity throughout the volume is provided for electromagnetic simulations to optimize advanced microwave devices.
Journal ArticleDOI
Freeform Fabrication of Magnetophotonic Crystals with Diamond Lattices of Oxide and Metallic Glasses for Terahertz Wave Control by Micro Patterning Stereolithography and Low Temperature Sintering
Soshu Kirihara,Maasa Nakano +1 more
TL;DR: Micrometer order magnetophotonic crystals with periodic arranged metallic glass and oxide glass composite materials were fabricated by stereolithographic method to reflect electromagnetic waves in terahertz frequency ranges through Bragg diffraction.
Journal Article
Creation of Functional Ceramics Structures by Using Stereolithographic 3D Printing
TL;DR: In this paper, the fabrication processes of ceramic dendrites and numerical simulations of spatial gas flows, electromagnetic wave propagations and biological fluid flows are discussed for novel energy harvesting devices and biocompatible implants.
References
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Journal ArticleDOI
Existence of a Photonic Gap in Periodic Dielectric Structures
TL;DR: It is determined that dielectric spheres arranged in the diamond structure do possess a full photonic band gap, and this gap exists for refractive-index contrasts as low as 2.5%.
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Non-destructive terahertz imaging of illicit drugs using spectral fingerprints.
TL;DR: A novel basic technology for terahertz imaging is developed, which allows detection and identification of drugs concealed in envelopes, by introducing the component spatial pattern analysis.
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Terahertz Pulsed Imaging of Skin Cancer in the Time and Frequency Domain
TL;DR: This work presents the first frequency-domain analysis of basal cell carcinoma in vitro, with the raw power spectrum giving an insight into the surface features of the skin using terahertz Pulsed Imaging.
Fabrication of electromagnetic crystals with a complete diamond structure by stereography
TL;DR: In this article, a diamond lattice with a diamond structure was designed to reflect electromagnetic waves by forming an electromagnetic bandgap in the GHz range, and the location of the band gap agreed with the band calculation using the plane wave propagation method.
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FDTD study of resonance Processes in metamaterials
TL;DR: In this article, the authors used finite-difference time-domain simulations in the frequency domain to study resonance phenomena in left-handed metamaterials consisting of the arrays of split-ring resonators (SRRs) and metal rods.