Faculty Profiles - BENINO Yasuhiko

Papers - BENINO Yasuhiko

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Selective surface crystallization of nonstoichiometric 30BaO-15TiO(2)-55GeO(2) glass Reviewed

Hirokazu Masai, Takumi Fujiwara, Yasuhiko Benino, Takayuki Komatsu, Hiroshi Mori

JOURNAL OF APPLIED PHYSICS 101 ( 3 ) 33530 2007.2

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS

The correlation between heat-treatment temperature for crystallization and orientation of surface crystalline phase, which should correspond to the intensity of second-order optical nonlinear susceptibility, in 30BaO-15TiO(2)-55GeO(2) (BTG55) crystallized glass was examined by measurements of x-ray diffraction (XRD) and second harmonic generation. A highly oriented fresnoite (Ba2TiGe2O8) or benitoite (BaTiGe3O9) phase was found to nucleate from the same mother BTG55 glass depending on the heat-treatment temperature, and both the fresnoite and benitoite phases showed XRD patterns of surface crystallization. It was found that the crystallization behavior of the two phases was strongly affected by the heat-treatment temperature. Based on this finding, the nonlinear optical property has also been tailored using the heat-treatment procedures. (c) 2007 American Institute of Physics.

DOI： 10.1063/1.2433992

Web of Science

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Laser-induced crystallization of β'-RE_2(MoO_4)_3 ferroelectrics (RE:Sm,Gd,Dy) in glasses and their surface morphologies

NAKAJIMA R.

J. Non-Cryst. Solids 353 85 - 93 2007.1

Patterning and characterization of ferroelectric crystal lines at the glass surface by laser-induced crystallization Reviewed

T. Komatsu, M. Sato, R. Nakajima, H. Sugita, K. Koshiba, T. Honma, Y. Benino

2007 SIXTEENTH IEEE INTERNATIONAL SYMPOSIUM ON THE APPLICATIONS OF FERROELECTRICS, VOLS 1 AND 2 293 - 294 2007

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

A technique for the patterning of ferroelectric crystal lines such as Sr(0.5)Ba(0.5)Nb(2)O(6), LiNbO(3), beta'-Gd(2)(MoO(4))(3) at the glass surface has been developed, i.e., transition metal atom heat processing, in which continuous wave lasers such as Nd:YAG (wavelength: lambda=1064 nm) are irradiated to the glasses containing transition metal (TM: Cu(2+), Ni(2+)) ions. The absorbed laser results in local heating of glass, consequently inducting crystallization. By scanning laser (power: < 1W) at constant speeds such as 10 mu m/s, ferroelectric crystal lines are written successfully at the glass surface. The surface morphology and orientation of crystals in the lines are clarified from confocal laser microscope observations and polarized micro-Raman scattering spectra measurements. In some glasses, the patterning of crystal lines consisting of oriented ferroelectrics is possible.

DOI： 10.1109/ISAF.2007.4393245

Web of Science

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Electronic polarizability and crystallization of K2O-TiO2-GeO2 glasses with high TiO2 contents

T. Fukushima, *Y. Benino, T. Fujiwara, V. Dimitrov and T. Komatsu

J. Solid Stat. Chem. 2006.12

Enhancement of second harmonic intensity in thermally poled ferroelectric nanocrystallized glasses in the BaO-TiO2-SiO2 system

N. Toyohara, *Y. Benino, T. Fujiwara and T. Komatsu

Solid Stat. Commun. 2006.9

Novel technique for fabrication of nanoparticle structures in KNbO3-TeO2 glass for photonic integral circuits

S. Mizuno, *Y. Benino, T. Fujiwara and T. Komatsu

Jap. J. Appl. Phys. 2006.8

Large second-order optical nonlinearity in 30BaO-15TiO2-55GeO2 surface crystallized glass with strong orientation

Masai Hirokazu, Fujiwara Takumi, Benino Yasuhiko, Komatsu Takayuki

Journal of Applied Physics 100 ( 2 ) 23526 - 23526 2006.7

Crystallization of langasite-type phases in gallium germanate glasses and optical properties of crystallized glasses

S. Kosaka, Y. Takahashi, *Y. Benino, T. Fujiwara and T. Komatsu

Opt. Mater. 2006.7

Transition metal atom heat processing for writing of crystal lines in glass

Honma Tsuyoshi, Benino Yasuhiko, Fujiwara Takumi, Komatsu Takayuki

Applied Physics Letters 88 ( 23 ) 231105 - 231105 2006.6

Synthesis of nanocrystals in KNb(Ge,Si)O5 glasses and chemical etching of nanocrystallized glass fibers

I. Enomoto, *Y. Benino, T. Fujiwara and T. Komatsu

J. Solid Stat. Chem. 2006.6

Nano-crystallized glass fibers with second-order optical nonlinearity

N. Iwafuchi, S. Mizuno, *Y. Benino, T. Fujiwara and T. Komatsu

Adv. Mater. Res. 2006.4

Order/disorder hybrid structures in photonic glass materials

T. Fujiwara, T. Honma, S. Mizuno, N. Iwafuchi, *Y. Benino and T. Komatsu

Adv. Mater. Res. 2006.4

Development of new crystallized glasses with nanocrystals and nonlinear optical properties

*Y. Benino, T. Fujiwara and T. Komatsu

Adv. Mater. Res. 2006.4

Improvement of second-order optical nonlinearity in transparent Ba2TiGe2O8 crystallized glasses prepared in a high magnetic field

N. Toyohara, *Y. Benino, T. Fujiwara, S. Tanaka, K. Uematsu, Y. Takahashi and T. Komatsu

Adv. Mater. Res. 2006.4

Fabrication of optical waveguide in glass by laser-induced crystallization

R. Ihara, *Y. Benino, T. Fujiwara and T. Komatsu

Adv. Mater. Res. 2006.4

Formation of nano-particle structures induced by ultraviolet laser irradiations in tellurite-based glass

S. Mizuno, *Y. Benino, T. Fujiwara and T. Komatsu

J. Ceram. Soc. Jpn. 2006.3

Formation of nano-particle structures induced by ultraviolet laser irradiations in KNbO3-TeO2 glass Reviewed

S Mizuno, Y Benino, T Fujiwara, T Komatsu

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 114 ( 1327 ) 293 - 295 2006.3

Language：English Publishing type：Research paper (scientific journal) Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

We report on a novel technique for formation of nano-particle structures in KNbO3-TeO2, glasses induced by ultraviolet (UV) XeCl excimer laser irradiations operating at 308 nm wavelength. The glasses with a composition of 0.5Er(2)O(3)-15K(2)O-15Nb(2)O(5)-70TeO(2) (mol%), which are known to exhibit a nano-crystallization behavior by heat treatments, have been used in this experiment. It has been found that the morphological properties of nanoparticles, such as diameter, height, and distribution density of nano-particles, can be tailored by the pulsed UV laser conditions. The nature of these nano-structures on glass surface induced by laser processing has been clarified that laser-induced nano-particles are consisting of the same composition as that in glass substrate.

DOI： 10.2109/jcersj.114.293

Web of Science

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Enhancement and depression in second-order optical nonlinearity of Ba2TiGe2O8 in crystallized glass prepared in a high magnetic field

N. Toyohara, *Y. Benino, T. Fujiwara, S. Tanaka, K. Uematsu, Y. Takahashi and T. Komatsu

J. Appl. Phys. 2006.2

Improvement of second-order optical nonlinearity in transparent Ba 2TiGe2O8 crystallized glasses prepared in high magnetic field

Nozomu Toyohara, Yasuhiko Benino, Takumi Fujiwara, Satoshi Tanaka, Keizo Uematsu, Yoshihiro Takahashi, Takayuki Komatsu

Advanced Materials Research 11-12 193 - 196 2006

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Trans Tech Publications

A high magnetic field of H = 10 T was applied to 30BaO-15TiO 2-55GeO2 glass through its crystallization process. It was found that the c-axis of Ba2TiGe2O8 optical nonlinear/ferroelectric crystals oriented along the magnetic field. The second harmonic intensity of crystallized glass which the high magnetic field was applied perpendicular to the surface of glass was enhanced compared with a conventional crystallization in no magnetic field. Transparencies, photorefractive indices and thicknesses were also measured. As a result, crystal orientation of Ba2TiGe2O8 in glass matrix induced by a high magnetic field causes improvement of transparency and low value of photorefractive index.

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Writing of two-dimensional crystal curved lines in Sm2O3-Bi2O3-B2O3 glass by samarium atom heat processing

R. Ihara, T. Honma, *Y. Benino, T. Fujiwara, R. Sato and T. Komatsu

Solid Stat. Commun. 2005.11

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