All issues
Volume 45, Issue 10
Special Issue on Surface Functionalization for Smart Material by Laser
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
Special Issue on Surface Functionalization for Smart Material by Laser
-
Koji ARAI2017 Volume 45 Issue 10 Pages 614-
Published: 2017
Released on J-STAGE: May 25, 2025
JOURNAL FREE ACCESSOn September 14, 2015, the two detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) simultaneously received a characteristic transient waveform. After detailed analysis and careful validation of the signal, it was determined that the signal came from the inspiral and merger of two black holes in a binary system 1.3 billion light years from earth. This was the first direct detection of GWs and the first observation of a binary black hole merger.1) LIGO detected two more binary black hole mergers in 2015 and 2017.2,3) In this article, GW detection using high precision laser interferometry is reviewed. Technological approaches in the current LIGO detectors will be introduced, as well as challenges for future generation detectors.View full abstractDownload PDF (1385K)
Special Issue
Laser Review
-
Masayuki OKOSHI2017 Volume 45 Issue 10 Pages 620-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSDownload PDF (185K) -
Tetsuo TSUCHIYA2017 Volume 45 Issue 10 Pages 621-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSIn order to construct low carbon society, it is necessary to develop a high performances new green device such as a solar cell, a lithium battery, a power semiconductor, and light emitting diode (LED) lighting and so on. Recently, flexible device using metal oxide materials and plastics have an attracted much attention due to weight lighting and flexibility. However, their processing temperature of the oxide materials are more than 500˚C. Therefore, it is necessary to develop the low temperature processing for oxide thin film. For this aim, we have developed photo-induced chemical solution process such as excimer laser-assisted metal organic deposition (ELAMOD) and photo reaction of nano-particle method (PRNP) for the preparation of the metal oxide thin film on organic, glass and single crystalline substrates. In this paper, we describes the formation of epitaxial and polycrystalline films and the preparation of flexible oxide films for new devices.View full abstractDownload PDF (1994K) -
Akira WATANABE, Jinguang CAI2017 Volume 45 Issue 10 Pages 627-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe fabricated a high-performance flexible in-plane micro-supercapacitor (MSC) with greatly improved energy and power densities by laser direct writing of a carbon interdigitated electrode on a polyimide film using a 405 nm blue-violet laser. The morphologies and electrical conductivities of the carbon layers formed on the polyimide surface were remarkably influenced by the laser powers and atmospheres during laser irradiation. An MSC prepared by laser carbonization in an inert Ar gas showed excellent cycling stability, good flexibility, and the capability of operating at a high energy density, which is expected as an energy storage device for Internet of Things (IoT) technology based on smart materials.View full abstractDownload PDF (844K) -
Tadatake SATO, Aiko NARAZAKI, Hiroyuki NIINO2017 Volume 45 Issue 10 Pages 632-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSLaser marking is a widely-used in industry owing to its process flexibility. Color laser marking is an interesting and smart material treatment method for producing permanent surface marking. It can contribute to increasing marked information, against counterfeiting, and so on. It originated by structural colors induced by formation of metal oxide layer with controlled thickness. This method is mainly applied to stainless steel or titanium. In addition to this, the method based on the formation of laserinduced periodic surface structure has been developed. Combination with other functionality such as super hydrophobicity are in progress.View full abstractDownload PDF (606K) -
Yuko AONO2017 Volume 45 Issue 10 Pages 637-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSThe wettability of glass surfaces is controlled by laser irradiation. The quantity of the remaining hydrophobic group on the glass surface depends on the laser power and the scan speed, and the quantity determines the contact angle of the glass from 110 to 40º. This modification has long-time stability and is unaccompanied by surface damages, cracks, morphology changes, or degradations of transparency. This local wettability control achieves a surface-flow channel on the glass substrate without grooves. The local hydrophilic area can be regarded as a channel because the water droplet selectively flows into the area. In addition, the contact angle’s gradation gives the droplet driving force toward a lower contact angle area. Modification of the surface-flow channel is expected to enable printing micro-fluidic systems on glass.View full abstractDownload PDF (752K) -
Masayuki OKOSHI2017 Volume 45 Issue 10 Pages 642-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe fabricated 1 μm high and 1.5 μm diameter microswellings on a silicone rubber surface at regular 2.5 μm intervals by a 193 nm ArF excimer laser. The laser was focused on silicone rubber by each microsphere made of 2.5 μm diameter silica glass, which covered the entire surface of the silicone rubber. The surface underneath each microsphere was selectively swelled due to the photodissociation of the Si-O bonds of the silicone. The water’s contact angle was measured to be approximately 155 degrees, indicating a clear superhydrophobic property. The samples successfully repelled water in water to form an air gap layer between the silicone rubber and the water.View full abstractDownload PDF (3052K)
Laser Original
-
Hidetoshi NOJIRI, Masayuki OKOSHI2017 Volume 45 Issue 10 Pages 646-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSSilicone-coated polycarbonate was photochemically modified into SiO2 by a 157 nm fluorine laser for developing an automobile resin window. Even though this product has been globally certified as a standard for scratch resistance, cracking was caused under a heat resistance test, and it was also found for more severe practical uses. To suppress the cracking under a heat resistance test, we successfully employed a steel-wool rubbing treatment to release the stress generated in the SiO2 modified layer and maintained the optical transparency. In the treatment, the 2 N/cm2 load during the rubbing reached its upper limit. Sandblasting and shot peening treatments were also used for comparison, but they did not suppress the cracking.View full abstractDownload PDF (704K) -
Masayuki OKOSHI2017 Volume 45 Issue 10 Pages 652-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSCorrosion resistant pure iron thin films were formed on silicon and silica glass substrates through 157- nm fluorine (F2) laser-induced photochemical surface modification. When a silica glass substrate was used, the thickness of the Fe3O4 modified layer remarkably increased from 2 to 8 nm in addition to a change in the surface color and surface swelling of the F2 laser-irradiated sample. We discussed why the thickness of the Fe3O4 modified layer increased, the surface color changed, and the surface swelled in terms of the difference of thermal conductivity between silicon and silica glass. We also examined the dependence of the thickness of pure iron thin films on the thickness of the Fe3O4 modified layer and the surface color change. The F2 laser-irradiated pure iron on silica glass successfully showed higher corrosion resistance to a 3 wt% NaCl aqueous solution; no rust was observed at 96 h and over, compared with the case in silicon substrate for 48 h.View full abstractDownload PDF (2132K)
Regular Paper
Laser Original
-
Miho TSUYAMA, Naoya EHARA, Kazuma YAMASHITA, Manabu HEYA, Hitoshi ...2017 Volume 45 Issue 10 Pages 658-
Published: 2017
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSLaser peening, which is a surface treatment technique that improves the mechanical performance of metals, is produced by plastic deformation due to laser-induced shock waves. Current studies on laser peening focus on the magnitude of compressive residual stress and the hardness of the laser-peened material. Systematic studies are required that consider many parameters related to efficient laser peening. In this study, we investigated effect of controlling the plasma confinement layer on laser peening and used an aqueous sucrose solution as the plasma confinement layer. The results indicate that the aqueous sucrose solution has the potential to confine laser-induced plasma. We improved the laser peening effect with an aqueous sucrose solution as the plasma confinement layer more than using water.View full abstractDownload PDF (621K)
- |<
- <
- 1
- >
- >|