レーザーアブレーション機構解明のためのナノ秒形態観察・分光システムと解析法の確立

建立纳秒形貌观察/光谱系统及分析方法，阐明激光烧蚀机理

• 批准号: 07554063
• 负责人: MASUHARA Hiroshi
• 金额: $ 2.18万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554063/
• 关键词: Laser Ablation; Time-resolved Interferometic Imaging; Time-resolved Spectroscopy; Condensed Organic Matters; Cyclic Multiphotonic Absorption; Photochemical Ablation; Photothermal Ablation; ナノ秒干渉出像計測; ナノ秒写真観察; 高分子フィルム; 高密度励起; レーザー誘起膨張; 時間分解マッピン

Photophysical and photochemical phenomena due to interactions of materials with light have received much attention and the 21st century is considered to be "Century of Light". We have devoted our efforts to the studies on organic materials including films, microcrystalline powders, polymer microspheres, and so on by ultrafast spectroscopy, microspectroscopy, photoreaction, and optical manipulation, during which we found that materials often undergo morphological changes due to high intensity laser excitation. This morphological dynamics is very interesting and important not only from photophysical and photochemical viewpoints but also for elucidating the dynamic aspects of structures and properties of materials.In the present work, we have developed nanosecond interferometry by combining Michelson interferometry with nanosecond excitation and probe lasers. The spatial and temporal resolutions of our system are 20 nm and 10 ns, respectively. Morphological dynamics revealed by the interferometry is compared with time-resolved absorption and fluorescence spectroscopic data and considered in detail, which is opening a new stage of molecular photoscience.Development of a new methodologyEstablishment of photothermal ablation mechanism by "cyclic multiphotonic absorption"Establishment of photochemical ablation mechanismExpansion/contraction dynamics of polymer filmPhotodecomposition reaction and etching dynamics of polymers

材料与光的相互作用所引起的光物理和光化学现象受到了广泛的关注，21世纪被认为是“光的世纪”。我们通过超快光谱、微光谱、光反应、光学操作等方法对薄膜、微晶粉末、聚合物微球等有机材料进行了研究，发现材料在高强度激光激发下经常发生形态变化。这种形态动力学不仅从光物理和光化学的角度来看是非常有趣和重要的，而且对于阐明材料结构和性质的动态方面也是非常重要的。在本工作中，我们将迈克尔逊干涉术与纳秒激发和探测激光相结合，发展了纳秒干涉术。系统的空间和时间分辨率分别为20 nm和10 ns。将干涉法揭示的形态动力学与时间分辨吸收光谱和荧光光谱数据进行了比较，并对其进行了详细的研究，从而开辟了分子光科学的新阶段。新方法的发展“循环多光子吸收”光热烧蚀机理的建立光化学烧蚀机理的建立聚合物薄膜的膨胀/收缩动力学聚合物的光分解反应和蚀刻动力学

项目成果

K.Hatanaka, M.Kawas, Y.Tsuboi, H.Fukumura, H.Masuhara: "Switching from photochemical to photothermal mechanism in laser ablation of benezene solutions" J.Appl.Phys.vol.82. 5799-5806 (1997)

K.Hatanaka、M.Kawas、Y.Tsuboi、H.Fukumura、H.Masuhara：“苯溶液激光烧蚀中从光化学机制转变为光热机制”J.Appl.Phys.vol.82。

LS.Bennett,T.Lippert,H.Furutani,H.Fukumura,and H.Masuhara: "Laser-induced Microexplosions of a Photosensitive Polymer" Appl.Phys.A,. Vol.63. 327-332 (1996)

LS.Bennett、T.Lippert、H.Furutani、H.Fukumura 和 H.Masuhara：“光敏聚合物的激光诱导微爆炸”Appl.Phys.A，。

H.Fukumura,Y.Kohji,H.Masuhara: "Laser implantation of fluorescent molecules into polymer films" Applied Surface Science. Vol.96-98. 569-571 (1996)

H.Fukumura、Y.Kohji、H.Masuhara：“将荧光分子激光植入聚合物薄膜”应用表面科学。

Yasuyuki Tsuboi, Shin-ichi Sakashita, Koji Hatanaka, Hiroshi Fukumura, and Hiroshi Masuhara: "Photothermal ablation of polystirene film by 248 nm excimer laser irradiation : a mechanistic study by time-resolved measurements" Laser Chem.16. 167 (1996)

Yasuyuki Tsuboi、Shin-ichi Sakashita、Koji Hatanaka、Hiroshi Fukumura 和 Hiroshi Masuhara：“248 nm 准分子激光照射对聚苯乙烯薄膜的光热烧蚀：通过时间分辨测量进行的机理研究”Laser Chem.16。

H.Furutani,H.Fukumura,and H.Masuhara: "Photothermal Transient Expansion and Contracion Dynamics of Polymer Films by Nanosecond Interferometry" J.Phys.Chem.,. Vol.100 No.17. 6871-6875 (1996)

H.Furutani、H.Fukumura 和 H.Masuhara：“通过纳秒干涉测量法研究聚合物薄膜的光热瞬态膨胀和收缩动力学”J.Phys.Chem.,。