Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Yoshiyuki Takahashi"'
Publikováno v:
Japanese Journal of Applied Physics. 47:6540-6543
We report the high speed spectral domain optical coherence tomography (OCT) with the frame rate of 40 frames/s (fps) using the InGaAs line scan camera and the optical probe with forward and side-imaging. This optical probe with the diameter of 2.6 mm
Publikováno v:
Applied Physics Express. 4:031501
Polarization switching dynamics at extremely high electric fields were measured for a 50-nm-thick ferroelectric vinylidene fluoride/trifluoroethylene copolymer film. Using a fast-rise voltage pulse with minimal duration, we obtained a switching time
Publikováno v:
Japanese Journal of Applied Physics. 48:09KE04
Ferroelectric switching measurements in a broad electric field range were conducted for spin-coated ultrathin vinylidene fluoride (VDF)/trifluoroethylene (TrFE) copolymer films deposited with an Au electrode. Application of an extremely high electric
Autor:
Shinobu Mukasa, Hiromichi Toyota, Yoshiyuki Takahashi, Shinfuku Nomura, Okuda Shinya, Toru Inoue
Publikováno v:
Japanese Journal of Applied Physics. 48:031601
The synthesis of diamond using in-liquid plasma chemical vapor deposition (CVD) is investigated in this study. Plasma in methanol solution is generated by applying microwave radiation of 2.45 GHz. The composition of the solution and the pressure in t
Autor:
Ayato Kawashima, Shinfuku Nomura, Tsunehiro Maehara, Hiroshi Yamashita, Hiromichi Toyota, Shinobu Mukasa, Yoshiyuki Takahashi
Publikováno v:
Applied Physics Express. 1:046002
The plasma in water is generated by applying high-frequency (HF) irradiation of 27.12 MHz or microwave (MW) radiation of 2.45 GHz from an electrode. The electrode is heated by joule heating by the HF or MW irradiation, and vapor bubbles are generated
Publikováno v:
Japanese Journal of Applied Physics. 45:7975
We have investigated the basic characteristics (scan depth, linearity, and stability) of a piezoelectric axial scanner (PAS) composed of optical fibers wound around a cylindrical piezoelectric transducer. The scan depth due to the stretching of the f
Publikováno v:
Japanese Journal of Applied Physics. 44:L1385
Time-domain measurements of ferroelectric polarization reversal were conducted for spin-coated ultrathin vinylidene fluoride/trifluoroethylene copolymer films deposited with an Au electrode. It was found that full polarization reversal occurs in 50
Publikováno v:
Japanese Journal of Applied Physics. 40:3246
Broadband dielectric spectroscopy has been employed to investigate the ion dynamics in polypropylene oxide (PPO) complexed with 0.1% LiClO4 over a molecular weight range of M=425–3500. It is found that ions undergo two types of motions: local fluct
Autor:
Takeo Furukawa, Yoshiyuki Takahashi
Publikováno v:
Japanese Journal of Applied Physics. 39:3511
The time evolution of the dielectric permittivity was measured for copolymers of vinylidene fluoride (VDF) with trifluoroethylene (TrFE) during the ferroelectric-paraelectric transition induced by a temperature jump. The results were analyzed on the
Publikováno v:
Japanese Journal of Applied Physics. 38:3589
Phase transition behavior in trifluoroethylene (TrFE)-rich copolymers of vinylidene fluoride (VDF) has been investigated by means of nonlinear dielectric spectroscopy. Unlike VDF-rich copolymers showing a single ferroelectric-to-paraelectric transiti