研究者詳細 - 三澤　弘明

MISC - 三澤　弘明

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三澤弘明

SUT Bulletin 16 ( 8 ) 8 - 13 1999年

Spectral Shift in Lasing Wavelengths due to Optical Kerr Effect in a Dye-doped Microsphere of Organic Polymer(共著)

Toshimasa Takahashi, Shigeki Matsuo, Hiroaki Misawa, Takashi Karatsu, Akihide Kitamura, Kenji Kamada, Koji Ohta

Nonlinear Optics, 22 ( 22 ) 397 - 400 1999年

Laser oscillation phenomena in dye-doped microspheres of some organic polymers were investigated. In case of poly(cyclohexylmethylsilane) (PCHMSi) microspheres, a spectral shift in lasing wavelengths was observed with increasing pumping power. The shift was explained in terms of optical Kerr effect (OKE) which come from the lasing light. The effective electric field which induced the OKE was estimated; the value was larger than that of pumping laser light. This result indicates that the effective electric field of light was efficiently amplified inside the microspheres.

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顕微鏡を用いた光造形法による微小立体構造物の作製

川上剛史, 松尾繁樹, 三澤弘明, 三輪昌史, 金子礼三

レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 259 41 - 45 1998年12月

Three-dimensional optical data storage in vitreous silica

M Watanabe, HB Sun, S Juodkazis, T Takahashi, S Matsuo, Y Suzuki, J Nishii, H Misawa

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 37 ( 12B ) L1527 - L1530 1998年12月

記述言語：英語出版者・発行元：JAPAN J APPLIED PHYSICS

To achieve high bit densities (>10 GB/cm(3)) in optical memory, we accomplished a three-dimensional optical data storage system using vitreous silica as the recording material. We succeeded in high-density optical recording by focusing pulsed laser beams of 532 nm (full width at half maximum [FWHM] 30 ps) and 400 nm (150 fs). A recording density of 72.9 GB/cm(3) was achieved, which corresponded to that of 100 compact disks, on a glass plate of (2 x 2) cm(2) and 2.2 mm thickness. We found that the optical damage of silica occurs within 400 ps after irradiation by a single pulse for 30 ps at 532 nm. Three photoluminescence bands were found in the photomodified silica at 283 nm, 468 nm and 558 nm. All the three bands showed similar photoluminescence excitation spectra, i.e. a peak related to oxygen vacancy absorption at 250 nm.

DOI： 10.1143/JJAP.37.L1527

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Morphology dependent resonant lasing of a dye-doped microsphere prepared by non-linear optical material

T Takahashi, S Matsuo, H Misawa, T Karatsu, A Kitamura, K Kamada, K Ohta

THIN SOLID FILMS 331 ( 1-2 ) 298 - 302 1998年10月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE SA

Laser oscillation from dye-doped microparticles of organic polymers was investigated. Spectral shift in peak wavelengths of laser oscillation depending on pumping intensity was observed in the microparticles of poly(cyclohexylmethylsilane) (PCHMSi). The shift observed for PCHMSi microparticles was discussed in terms of the third-order non-linear optical (NLO) effect. It was concluded that the effective power density of light just inside the microparticle's surface was about 30 times larger than that of the pump pulse. (C) 1998 Elsevier Science S,A, All rights reserved.

DOI： 10.1016/S0040-6090(98)00934-1

朴鐘震, 入江正浩, 増原宏, 橋本和仁, 三澤弘明

光化学 = Photochemistry 28 ( 1 ) 2 - 16 1998年8月

Photoelectrochemical fabrication of submicrometer platinum pattern on titanium dioxide single crystal surface

H Ishii, S Juodkazis, S Matsuo, H Misawa

CHEMISTRY LETTERS ( 7 ) 655 - 656 1998年7月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

Submicrometer patterning of TiO2-rutile single crystal surface by Pt was accomplished by means of photocatalytic reduction of PtCl42- to Pt in an aqueous solution of H2PtCl6. The patterns of Pt were fabricated along focal point traces of 380 nm wavelength excitation laser beam on the surface of rutile substrates.

DOI： 10.1246/cl.1998.655

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Self-organizing three-dimensional colloidal photonic crystal structure with augmented dielectric contrast

K Fukuda, H Sun, S Matsuo, H Misawa

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 37 ( 5A ) L508 - L511 1998年5月

記述言語：英語出版者・発行元：JAPAN J APPLIED PHYSICS

We demonstrated that low-velocity quasi-equilibrium evaporation of water from an aqueous colloidal solution of polystyrene microparticles with 220 nm diameter enabled the preparation of a three-dimensional colloidal-air photonic crystal structure without significantly distorting the lattice, and the absorption peak of the structure was observed at around 500 nm. A much stronger photonic band gap effect is expected due to an approximately 30% increase of the dielectric contrast.

DOI： 10.1143/JJAP.37.L508

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多光子吸収によるガラス光メモリー

三澤弘明

O plus E 20 ( 9 ) 1028 - 1032 1998年

多光子吸収励起過程を利用した三次元光記録

三澤弘明

光技術コンタクト 36 ( 3 ) 124 - 129 1998年

マイクロマシン技術とその応用

三澤弘明

STEP テクノ情報 3 ( 4 ) 2 - 6 1997年

レーザー光を利用した微粒子のマニピュレ—ション技術

三澤弘明, 三輪昌史

精密工学会誌 63 ( 7 ) 959 - 962 1997年

マルチフォトンプロセスを用いた三次元記録

三澤弘明

光化学 24 26 - 31 1997年

放射圧による高分子ゲルの相転移制御

三澤弘明

レーザー研究 24 ( 11 ) 1163 - 1168 1996年11月

石英ガラスを用いた三次元光記録

三澤弘明

化学と工業 = Chemistry and chemical industry 49 ( 2 ) 178 - 180 1996年2月

Infrared Laser-Induced Photo-Thermal Phase Transition of an Aqueous Poly (N-isopropylacryl-amide) Solution in the Micrometer Dimension (共著)

Bull. Chem. Soc. Jpn. 69 ( 59 ) 1996年

マイクロマシン材料のレーザー化学加工

三澤弘明

レーザー研究 24 ( 7 ) 750 - 756 1996年

記述言語：日本語出版者・発行元：The Laser Society of Japan

Laser manipulation-microfabrication system consisting of a CW laser, a picosecond pulsed laser and an optical microscope was developed to assemble micrometer-sized structure in solution. Photopolymerization of reactive monomers induced at the focal spot of picosecond laser pulses (λ = 355 nm or 532 nm, FWHM = 30 ps, repetation rate = 10 Hz) was employed for connection of glass particles regularly aligned by laser trapping. Since photopolymerization was induced in the vicinity of a focal spot, any desired numbers of glass particles with arbitrary geometrical structure can be connected by repeating the manipulation and the photopolymerization procedures.

DOI： 10.2184/lsj.24.750

CiNii Article

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00041014981?from=CiNii

Light emitting diode-based nanosecond ultraviolet light source for fluorescence lifetime measurements

T Araki, H Misawa

REVIEW OF SCIENTIFIC INSTRUMENTS 66 ( 12 ) 5469 - 5472 1995年12月

記述言語：英語出版者・発行元：AMER INST PHYSICS

A compact pulsed-light source is devised from an InGaN/AlGaN double heterostructure light-emitting diode (LED). The LED emits a 450-nm (blue) light under conventional de operation below 30 mA. When a current larger than 50 mA is applied, the intensity of the 450-nm Light saturates, but that of the 380-nm light due to the InGaN component continues to increase. This phenomenon is utilized to realize a nanosecond ultraviolet (UV) light source. Under repetitive, large current pulsing (frequency=10 kHz, pulse width=4 ns, peak current=2 A), the peak LED emission shifts from 450 to 380 nm. Intense light pulses (peak value=40 mW) of 4-ns duration were generated. To evaluate the potential of the pulsed LED as an excitation source, the fluorescence lifetime of a quinine-sulfate solution was measured. The observed Lifetime characteristics agreed well with the generally accepted behavior. (C) 1995 American Institute of Physics.

DOI： 10.1063/1.1146519

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Spectroscopic and kinetic studies on volume expansion processes of photoresponsive polyacrylamide microgels in water

M Ishikawa, H Misawa, N Kitamura, M Irie, H Masuhara

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 68 ( 12 ) 3397 - 3402 1995年12月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

Photostimulated volume expansion of polyacrylamide microgels (initial radius=11-235 mu m) bearing triphenylmethyl cyanide moieties (AAm-TPMCN) in water was studied on the basis of simultaneous measurements of the degree of ionic dissociation (alpha) of TPMCN to TPM(+) (triphenylmethyl cation) and the gel radius. The time profile of the radius change, r(t), was analyzed by a convolution relation between r(t) and the time course of alpha (alpha(t)). The characteristic time constants of the volume change, related to the cooperative diffusion coefficient of the gel network, were determined for AAm-TPMCN gels with various radii. The faster photoresponse time of the volume change for the smaller AAm-TPMCN gel was explained in terms of the diffusion theory of gel networks in water.

DOI： 10.1246/bcsj.68.3397

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PHOTOCHROMISM OF 1-(2-NAPHTHOXY)ANTHRAQUINONE

M TAJIMA, H MISAWA, H INOUE

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 89 ( 1 ) 53 - 59 1995年6月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE SA LAUSANNE

The photochromic behaviour of 1-(2-naphthoxy)anthraquinone (1) was investigated using electronic spectroscopy and kinetic analysis of the decay of coloured species. The decay of coloured species well obeyed first-order kinetics and consisted of two processes, reversion to the starting substance and the change toward final formation of 1-hydroxyanthraquinone (2). The reversion process was revealed to proceed through two different pathways having activation enthalpies of 30.5 and 104 kJ mol-1. The lower value suggests that the reversion proceeds from a rotational isomer of 1 while the higher value comes from a structural isomer of 1, 9-naphthoxy-1,10-anthraquinone. The activation enthalpy of the change toward final formation of 2 was 49.1 kJ mol(-1). The possible formation of the two different coloured species from the two conformers of 1 on light irradiation was discussed.

DOI： 10.1016/1010-6030(95)04037-G

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