Near-field infrared nanospectroscopy using IR ultra-short pulses

使用红外超短脉冲的近场红外纳米光谱

• 批准号: 11650830
• 负责人: INOUYE Yasushi
• 金额: $ 0.64万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650830/
• 关键词: infrared microspectroscopy; near field optics; vibrational spectroscopy; differential frequency generation; ultra short IR pulse; 振動分光

We proposed and developed a novel microscopic system for measuring infrared absorption spectra. Higher spatial-resolving capability and signal-to-noise ratio were achieved than those of a conventional system by combining an infrared microscopic system with infrared ultra-short pulses generated by an optically parametric phenomenon. We observed an absorption image of small polystyrene spheres (diameter : 10μm) dispersed on a CaF_2 substrate with IR pulses of 3.4μm which corresponds to C-H stretching vibration mode in polystyrene. Two small spheres adjacent to each other could be discerned, which means that spatial resolution equal to the diffraction limit of the wavelength was achieved. A distinct image of periodic structure of photoresist was also obtained with the IR pulses of 5.8μm which corresponds to C=O stretching vibration mode in an ester bonding.We also studied a possibility of near field infrared microspectroscopy which attains submicron spatial resolution. To realize the super resolving capability in infrared region, we design and fabricated a cantilever having a small aperture at an apex using a silicon micromachine process besides developing an atomic force microscopic system for controlling the cantilever. Then, we built a near field infrared microscope consisting of the IR pulse source, the IR microscope, the cantilevers having a 300-500nm aperture and the AFM module. High optical throughput of 10^<-3> for the near field IR probe was achieved in the system. The throughput was greater than the conventional sharpened-fiber probe by a factor of 10^2. These novel microspectroscopic systems will contribute to observation of dynamics of a single molecule by combining with time-resolved spectroscopic technique.

提出并研制了一种新型的红外吸收光谱显微测量系统。通过将红外显微系统与由光学参量现象产生的红外超短脉冲相结合，实现了比传统系统更高的空间分辨能力和信噪比。在3.4μm红外脉冲作用下，观察到分散在CaF_2衬底上的聚苯乙烯小球（直径10μm）的吸收像，它对应于聚苯乙烯中的C-H伸缩振动模。可以分辨出两个相邻的小球，这意味着实现了等于波长衍射极限的空间分辨率。用5.8μm的红外脉冲（对应于酯键中C=O伸缩振动模）也获得了光刻胶周期结构的清晰图像，并研究了近场红外显微光谱达到亚微米空间分辨率的可能性。为了实现红外超分辨能力，我们设计并制作了一个具有小孔径的悬臂梁在顶点使用硅微加工工艺，除了开发一个原子力显微镜系统控制悬臂梁。然后，我们建立了一个近场红外显微镜组成的红外脉冲源，红外显微镜，具有300- 500 nm孔径的杠杆和原子力显微镜模块。该<-3>系统实现了近场红外探测器10 μ s的高光通量。其吞吐量比传统的锐尖光纤探头高出10^2倍。这些新的显微光谱系统与时间分辨光谱技术相结合，将有助于单分子动力学的观察。

项目成果

N.Hayazawa: "Metallized tip amplification of near-field Raman scattering"Opt.Commun.. 183・1. 333-336 (2000)

N.Hayazawa：“近场拉曼散射的金属化尖端放大”Opt.Commun. 183・1（2000）。

K.Okamoto, Y.Inouye, and S.Kawata: "Atomic-beam propagation in a two-dimensional standing wave of light : a numerical analysis based on a particle-optics"Jpn.J.Appl.Phys.. 40. 609-613 (2001)

K.Okamoto、Y.Inouye 和 S.Kawata：“光的二维驻波中的原子束传播：基于粒子光学的数值分析”Jpn.J.Appl.Phys.. 40. 609

Y.Inouye, N.Hayazawa, K.Hayashi, Z.Sekkat and S.Kawata: "Near-field scanning optical microscope using a metallized cantilever tip for nanospectroscopy"Proc.Soc.Photo-Opt.Instrum.Eng.. 3791. 40-48 (1999)

Y.Inouye、N.Hayazawa、K.Hayashi、Z.Sekkat 和 S.Kawata：“使用金属化悬臂尖端进行纳米光谱学的近场扫描光学显微镜”Proc.Soc.Photo-Opt.Instrum.Eng.. 3791。

K.Okamoto: "Atomic-beam propagation in a two-dimensional standing wave of light : a numerical analysis based on a particle-optics"Jpn.J.Appl.Phys.. 40・2. 609-613 (2001)

K.Okamoto：“光的二维驻波中的原子束传播：基于粒子光学的数值分析”Jpn.J.Appl.Phys.. 40・2（2001）。

井上康志: "顕微分光の新展開:多光子過程と近接場光学-III.多光子近接場顕微分光"分光研究. 48. 119-132 (1999)

Yasushi Inoue：“显微光谱学的新发展：多光子过程和近场光学 - III.多光子近场显微光谱学”光谱研究 48. 119-132 (1999)。