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Fabrication

About: Fabrication is a research topic. Over the lifetime, 20475 publications have been published within this topic receiving 235676 citations.


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TL;DR: In this article, a powder-in-closed-tube (PICT) fabrication method was proposed to suppress Mg evaporation by uniaxial pressing of both ends of the metal tubes.
Abstract: Systematic research on the improvement in Jc of MgB2 bulks by the optimization of sintering conditions was performed by applying a highly reproducible fabrication method. Compared with conventional methods, the fabrication method in the present study (powder-in-closed-tube, PICT) has quite a simple procedure: packing powders into the stainless tubes, pressing and sintering. The major merit of the fabrication method is complete suppression of Mg evaporation by uniaxial pressing of both ends of the metal tubes. Furthermore, resulting samples have the tape shape which is regarded as the short conductor with mono-core. Therefore, their critical current properties can be evaluated by the transport method as well as magnetic measurements. The undoped MgB2 bulk synthesized with optimized sintering conditions, at 850 °C for 3 h, recorded a high Jc of 3.9 × 105 A cm−2 at 20 K under self-field.

69 citations

Journal ArticleDOI
TL;DR: In this article, a method for predicting and precisely controlling the structure of photonic crystals fabricated using sacrificiallayer atomic layer deposition is presented, which provides a reliable method for fabrication of high-quality non-close-packed inverse shell opals with large static tunability and precise structural control.
Abstract: A method is presented for predicting and precisely controlling the structure of photonic crystals fabricated using sacrificiallayer atomic layer deposition. This technique provides a reliable method for fabrication of high-quality non-close-packed inverse shell opals with large static tunability and precise structural control. By using a sacrificial layer during opal infiltration, the inverse-opal pore size can be increased with sub-nanometer resolution and without distorting the lattice to allow for a high degree of dielectric backfilling and increased optical tunability. For a 10% sacrificial layer, static tunability of 80% is predicted for the inverse opal. To illustrate this technique, SiO2 opal templates were infiltrated using atomic layer deposition of ZnS, Al2O3, and TiO2. Experimentally, a static tunability of over 600 nm, or 58%, was achieved and is well described by both a geometrical model and a numerical-simulation algorithm. When extended to materials of higher refractive index, this method will allow the facile fabrication of 3D photonic crystals with optimized photonic bandgaps.

69 citations

Journal ArticleDOI
TL;DR: In this article, a complementary metal-oxide-semiconductor compatible fabrication technique for ultrathin silicon chips of arbitrary shape is reported, which combines deep reactive ion etching and wafer grinding to define the in-plane geometry and thickness of the chips, respectively.
Abstract: A complementary-metal-oxide-semiconductor-compatible fabrication technique for ultrathin silicon chips of arbitrary shape is reported. It combines deep reactive ion etching and wafer grinding to define the in-plane geometry and thickness of the chips, respectively. Neural probes with shaft lengths up to 12 mm and thicknesses down to 25 μm were fabricated.

69 citations

Journal ArticleDOI
TL;DR: A bi-layer lift-off fabrication approach to create low-loss amorphous titanium dioxide (TiO2) integrated optical waveguides and resonators for visible and near-infrared applications achieves single-mode waveguide losses as low as 7.5 dB/cm and 1.2 dB/ cm, a factor of 4 improvement over previous reports, without the need to optimize etching conditions.
Abstract: We present a bi-layer lift-off fabrication approach to create low-loss amorphous titanium dioxide (TiO2) integrated optical waveguides and resonators for visible and near-infrared applications. This approach achieves single-mode waveguide losses as low as 7.5 dB/cm around 633 nm and 1.2 dB/cm around 1550 nm, a factor of 4 improvement over previous reports, without the need to optimize etching conditions. Depositing a secondary 260-nm TiO2 layer can reduce losses further, with the optimized process yielding micro-ring resonators with loaded quality factors as high as 1.5 × 105 around 1550 nm and 1.6×105 around 780 nm. These losses render our TiO2 devices suitable for visible and telecommunications applications; in addition, the simplicity of this lift-off approach is broadly applicable to other novel material platforms, particularly using near-visible wavelengths.

69 citations

Journal ArticleDOI
TL;DR: In this article, a wide range of ceramics have been demonstrated, including aluminium oxide, silica, hydroxyapatite, silicon nitride, and lead zirconate titanate, with techniques based on extrusion, ink jet deposition, green tape lamination, and photopolymerisation.
Abstract: Fabrication of ceramic objects by solid freeform fabrication (SFF) techniques is reviewed, with emphasis on ceramic versions of commercial rapid prototyping (RP) methods. A wide range of ceramics have been demonstrated, including aluminium oxide, silica, hydroxyapatite, silicon nitride, and lead zirconate titanate, with techniques based on extrusion, ink jet deposition, green tape lamination, and photopolymerisation. The quality of SFF ceramics compares well with conventionally processed ceramics.

69 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20235,291
202210,627
2021845
2020805
2019944