研究者詳細 - 三澤　弘明

MISC - 三澤　弘明

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有機物フォトニック結晶(<小特集>フォトニック結晶)

松尾繁樹, 三澤弘明

日本結晶成長学会誌 28 ( 1 ) 25 - 30 2001年3月

記述言語：日本語出版者・発行元：日本結晶成長学会

The mainstream of fabrication of photonic crystals is inorganic semiconductor techniques. Organic photonic crystals are not major, but possess unique and attracting futures. In this review, we introduce fabrication techniques of organic photonic crystals such as microsphere segmentation, laser microfabrication and laser interference fabrication. The advantage of microsphere segmentation is simple process to make micro periodicity, while that of laser microfabrication is high freedom of designing the photonic crystals. Characteristic applications of organic photonic crystals are also mention...

DOI： 10.19009/jjacg.28.1_25

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Femtosecond laser-assisted three-dimensional microfabrication in silica

A Marcinkevicius, S Juodkazis, M Watanabe, M Miwa, S Matsuo, H Misawa, J Nishii

OPTICS LETTERS 26 ( 5 ) 277 - 279 2001年3月

記述言語：英語出版者・発行元：OPTICAL SOC AMER

We demonstrate direct three-dimensional (3-D) microfabrication inside a volume of silica glass. The whole fabrication process was carried out in two steps: (i) writing of the preprogrammed 3-D pattern inside silica glass by focused femtosecond (fs) laser pulses and (ii) etching of the written structure in a 5% aqueous solution of HF acid. This technique allows fabrication of 3-D channels as small as 10 mum in diameter inside the volume with any angle of interconnection and a high aspect ratio (10-mum-diameter channels in a 100-mum-thick silica slab). (C) 2001 Optical Society of America.

DOI： 10.1364/OL.26.000277

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Arbitrary-lattice photonic crystals created by multiphoton microfabrication

HB Sun, Y Xu, S Juodkazis, K Sun, M Watanabe, S Matsuo, H Misawa, J Nishii

OPTICS LETTERS 26 ( 6 ) 325 - 327 2001年3月

記述言語：英語出版者・発行元：OPTICAL SOC AMER

We used voxels of an intensely modified refractive index generated by multiphoton absorption at the focus of femtosecond laser pulses in Ge-doped silica as photonic atoms to build photonic lattices. The voxels were spatially organized in the same way as atoms arrayed in actual crystals, and a Bragg-like diffraction from the photonic atoms was evidenced by a photonic bandgap (PBG) effect Postfabrication annealing was found to be essential for reducing random scattering and therefore enhancing PEG. This technique has an intrinsic capability of individually addressing single atoms. Therefore the introduction of defect structures was much facilitated, making the technique quite appealing for photonic research and applications. (C) 2001 Optical Society of America.

DOI： 10.1364/OL.26.000325

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多光子吸収による3次元フォトニック結晶の作製

三澤弘明

表面科学 22 ( 11 ) 729 - 734 2001年

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

Photomodification of transparent dielectric materials, induced by tightly focused laser beams, can be utilized for the fabrication of 3 D photonic crystal (PhC) structures. The photomodification occurs in the focal region of the beam due to multiphoton absorption. Nonlinearity of this process allows to reduce the size of the photomodified region even below the diffractive limit of the focusing optics. We utilize two types of photomodification for the PhC fabrication: (i) damage in silica glass that leaves empty voxels, and (ii) polymerization in liquid resins that leaves solid voxels. By damaging/solidifying the initial materials at precisely controlled periodic locations, we have recorded 3 D PhC structures. Using the (i) process we have recorded PhCs in silica with 3 D fcc lattice types, which exhibit clear signatures of photonic bandgaps in the near IR spectral region. With (ii) process we have recorded log-pile PhC structures, which exhibit photonic bandgaps and microcavity effects in the same spectral region.

DOI： 10.1380/jsssj.22.729

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00123565219?from=CiNii

超高感度マイクロ集積化分析システムの開発

三澤弘明

STEPねっとわ〜く 2 10 - 12 2001年

フェムト秒加工

三澤弘明

オプトニューズ 1 33 - 34 2001年

刺激応答ゲルを用いた焦点可変マイクロレンズ・アレイの製作

三澤弘明

電気学会論文誌E センサマイクロマシン準部門誌 121 ( 4 ) 158 - 162 2001年

多光子吸収による三次元マイクロファブリケーション

三澤弘明

化学工業 52 ( 4 ) 14 - 18 2001年

多光子吸収による光化学反応の空間制御

三澤弘明

化学と工業 54 ( 12 ) 1377 - 1379 2001年

フェムト秒超加工による3次元フォトニック結晶の作製

三澤弘明

レーザー加工学会誌 8 ( 3 ) 7 - 10 2001年

Submicrometer lithography by near-field optical microscopy

Saulius Juodkazis, Y. Arisawa, S. Matsuo, H. Misawa, R. Tomasiunas, J. Vaitkus

Proceedings of SPIE-The International Society for Optical Engineering 4318 42 - 47 2001年

記述言語：英語

Optimization of (i) intensity of illumination and (ii) thickness of resist was made looking for the conditions when high spatial resolution could be achieved by optical near-field lithography. Standard set-up of near-field illumination through a tapered Al-coated fiber tip was employed for the exposure of positive resist OFPR-5000(EG), which is photo-sensitive for wavelength λ &lt
450 nm. Tip was scanned along the line at near-field conditions of constant sample-to-tip separation to produce adjustable exposure dose of the spin-coated resist film. Femtosecond, 120 fs, pulses of the power P &lt
1 mW (at 82 MHz repetition rate) at 400 nm were coupled into a fiber (&lt
1 m length) and delivered to the surface of the resist for illumination.The issues of NSOM fabrication using tapered Al-coated tips are addressed. To achieve a reproducible and high aspect ratio (approaching 1: 1) NSOM-based lithography there should be found resists allowing to produce thin films (&lt
100 nm) with low surface roughness (&lt
10 nm).

DOI： 10.1117/12.417618

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フェムト秒レーザー加工によるサファイアなど透明材料の機能化

三澤弘明

レーザー研究 30 ( 5 ) 239 - 243 2001年

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

Functionalization of dielectric materials such as crystals, glasses (silica-related or polymers), and liquid polymerizable resins by femtosecond (100-500 fs) irradiation is summarized. The modification was carried out by employing tight focusing optics with numerical aperture typically NA > 0.6. This allows to produce 3D optical memory and photonic crystals (PhC) by implementing a principle of the focal spot scanning inside silica glass or polymerizable resin. PhCs can be also fabricated by encoding the 3D hologram in negative polymer photoresist. Optically modified regions of dielectric were found to respond sensitively to wet etching. The contrast in the etching rate is over 50, which makes it possible to fabricate 3D channels for microfluidics inside dielectrics.

DOI： 10.2184/lsj.30.239

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00156862163?from=CiNii

集光フェムト秒レーザーによる透明材料のナノ加工

三澤弘明

NEW GLASS 16 ( 3 ) 38 - 41 2001年

Laser micro-fabrication/manipulation of dielectric materials

Hiroaki Misawa, Saulius Juodkazis, Andrius Marcinkevi?ius, Vygantas Mizeikis, Akira Yamaguchi, Hongbo Sun, Shigeki Matsuo

Proceedings of the International Symposium on Micro Machine and Human Science 23 - 33 2000年12月

We describe microfabrication of various materials by multi-photon absorption (MPA) of femtosecond (120-150 fs) light pulses. The photo-modification at the focal point of tightly focused laser beam occurs inherently within volume smaller than that defined by the diffraction limit. The achievable lateral resolution is compared with that obtainable by lithography which uses near-field optical microscopy (NSOM). This technique can in principle lead to the realization of 3D optical memory and photonic crystals (PhC) with arbitrary lattice in polymers and silica glass, 3D prototyping in polymerizable resins, and etching of 3D structures guided by the optically damaged pattern in silica. Another topic also discussed in this work deals with laser micromanipulation using continuos wave (cw) laser operating at 1.06 μm. Light-controlled revolution of liquid crystal droplet and volume-phase transition of gel will be described.

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Three-dimensional photonic crystal structures achieved with self-organization of colloidal particles

J. Song, H. Sun, Y. Xu, Y. Fu, S. Matsuo, H. Misawa, G. Du

Optical and Quantum Electronics 32 ( 12 ) 1295 - 1300 2000年12月

記述言語：英語出版者・発行元：Kluwer Academic Publishers

Three-dimensional polystyrene/air photonic crystal structure with different particle diameters: 200, 270 and 340 nm was achieved. Strong photonic band gap effect reflected with transmission minimum down to -16 dB was observed. The central wavelengths of the valleys of spectra were well fitted with theoretical calculation. The augmentation of band gap effect versus particle diameter was attributed to an improved self-assembling of particles. An analysis of transmission spectra is also presented. The agreement between the results of experiment and numerical analysis is good.

DOI： 10.1023/A:1026513628764

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Crosstalk in photoluminescence readout of three-dimensional memory in vitreous silica by one- and two-photon excitation

M Watanabe, S Juodkazis, S Matsuo, J Nishii, H Misawa

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 39 ( 12A ) 6763 - 6767 2000年12月

記述言語：英語出版者・発行元：INST PURE APPLIED PHYSICS

We report the readout of three-dimensional (3-D) memory of bits from their photoluminescence (PL). The bits were recorded inside vitreous silica by optical damage (micro-explosion), which was induced by 150 fs single pulse irradiation at the focal point. The bit can be written by 0.2-0.5 muJ energy pulses at 400 nm or 800 nm (the pulse energy was given at the irradiation point and had an intensity of about 10(15) W/cm(2) when a high numerical aperture of NA = 1.3 objective lens was used for recording). The readout was obtained by the PL of the 3-D pattern of damaged bits, which were excited by quasi-continuos (repetition rate of 82 MHz) fs-irradiation at much lower pulse intensity (by a factor of 10(6)) in order to exclude secondary damage. The readout was performed by the oil-immersion objective lens of NA = 1.3. The wavelength of PL excitation was 400 nm for one-photon and 800 nm for two-photon excitation of pi, with the single pulse energy of less than 1 pJ. We found that the crosstalk of pi, readout is the same as that for the transmission imaging and measures 4 mum in the inter-plane distance for the case of one-photon excitation and can be reduced to 3 mum when a reflection-type readout system is used together with two-phr,ton excitation (theoretical axial hit size for fabrication of a given optics was 1.4 mum). Two-photon readout of 3-D memory in silica is demonstrated for the first time.

DOI： 10.1143/JJAP.39.6763

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445 Ni-Ti 形状記憶合金薄膜の力学的特性評価

久保豊和, 高木均, 岡野耕次, 三澤弘明, 松尾繁樹, 浅井真人

計算力学講演会講演論文集 2000 ( 13 ) 453 - 454 2000年11月

光応用 : レーザトラップ

三澤弘明

日本機械学会誌 103 ( 984 ) 749 - 751 2000年11月

Reversible phase transitions in polymer gels induced by radiation forces

S Juodkazis, N Mukai, R Wakaki, A Yamaguchi, S Matsuo, H Misawa

NATURE 408 ( 6809 ) 178 - 181 2000年11月

記述言語：英語出版者・発行元：MACMILLAN PUBLISHERS LTD

Many polymer gels undergo reversible, discontinuous volume changes in response to changes in the balance between repulsive intermolecular forces that act to expand the polymer network and attractive forces that act to shrink it. Repulsive forces are usually electrostatic or hydrophobic in nature, whereas attraction is mediated by hydrogen bonding or van der Waals interactions. The competition between these counteracting forces, and hence the gel volume(1-3), can thus be controlled by subtle changes in parameters such as pH (ref. 4), temperature(5), solvent composition(6) or gel composition(7). Here we describe a more direct influence on this balance of forces, by showing that the radiation force generated by a focused laser beam induces reversible shrinkage in polymer gels. Control experiments confirm that the laser-induced volume phase transitions are due to radiation forces, rather than local heating, modifying the weak interactions in the gels, in agreement with previous observations of light-induced chain association in polymer solutions(8,9). We rnd that, owing to shear-relaxation processes(10), gel shrinkage occurs up to several tens of micrometres away from the irradiation spot, raising the prospect that the combination of stimuli-responsive polymer gels and laser light might lead to new gel-based systems for applications such as actuating or sensing.

DOI： 10.1038/35041522

三澤弘明

光化学 = Photochemistry 31 ( 2 ) 139 - 141 2000年8月

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