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1997 Fiscal Year Final Research Report Summary

Near-field optical and atomic-force microscopy by use of the laser trapping technique of a probe

Research Project

Project/Area Number 07405005
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied optics/Quantum optical engineering
Research InstitutionOsaka University

Principal Investigator

KAWATA Satoshi  School of Engineering, Osaka University, Professor, 工学部, 教授 (30144439)

Co-Investigator(Kenkyū-buntansha) TAKAMATSU Tetsuro  Kyoto Prefectual University of Medicine, Professor, 教授 (40154900)
NAKAMURA Osamu  School of Engineering, Osaka University, Associate Professor, 工学部, 助教授 (90192674)
Project Period (FY) 1995 – 1997
Keywordslaser trapping / near-field optics / friction force / FDTD method / 3D micro-fabrication / UV-photopolymerizable resin / two photon absorption
Research Abstract

We developed a scanning friction-force microscope which uses a small sphere trapped and scanned by laser beam. The force can be detected as position shift of the sphere, during the sample scanning. The system consists of an inverted microscope, a scanning stage, a near-infrared laser (Nd : YAG,2W), illumination optics, a position detector, and a computer for control. The detection limit of the friction-force with the system was 1.0(]SY.+-。[)0.2pN when we observed the surface of glass or PMMA.
We added detection optics for near-field optical signal to the system in order to realize a near-field optical microscope. Since the microscope uses a laser trapped probe, which is trapped by pico-Newton-order force in water, the system has advantages as follows : 1) it gives little damage to the sample, 2) the distance between the sample surface and the probe is constant, and 3) the spatial resolution can be controlled by choosing an appropriate size of the probe. By using this system we trapped n … More ot only dielectric spheres but also metallic spheres. The metallic sphere has high scattering efficiency and provides high signal-to-noise ratio. Moreover small sphere (phi40nm) attains high spatial resolution.
We developed three-dimensional microfabrication technique using two-photon absorption. Two-photon absorption process makes it possible to stiffen only small spot near the focal point. We estimated that lateral and axial resolutions are 0.6mum and 1.0mum respectively, by optimizing pulse-width and real power of mode-locked Ti : Sapphire laser (790nm). This system provides one-order higher resolution than conventional systems. Therefore this technique is available to make a probe, that can be stably and precisely trapped by a laser beam.
We also showed that finite-difference time-domain (FDTD) method is effective to amalyze the photon force in near-field. We succeeded in calculation of the irradiation forces (=trapping forces) of evanescent or propagation light field to any shapes or materials probes. We investigated the size, the material, and the shape of the probe which is suitable for the microscope we developed. Less

  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] H.Furukawa and S.Kawata: "Analysis of image formation in a near-field scanning optical microscope : Effects of multiple scattering" Opt.Commun.132. 170-178 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Kawata and T.Tani: "Optically driven Mie particles in an evanescent field along a channeled waveguide" Opt.Lett.21. 1768-1770 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Inouye and S.Kawata: "Reflection-mode near-field optical microscope with a metallic probe tip for observing fine structures in semiconductor materials" Opt.Commun.134. 31-35 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Hatano, Y.Inouye and S.Kawata: "Near-field optical microscope with a multiheight scanning-imaging mode" Opt.Lett.22. 1532-1534 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sugiura, K.Okada, Y.Inouye, O.Nakamura and S.Kawata: "Gold-bead scanning near-field optical microscope with laser-force position control" Opt.Lett.22. 1663-1665 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Maruo, O.Nakamura and S.kawata: "Three-dimensional microfabrication with two-photon absorbed photopolymerization" Opt.Lett.22. 132-134 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大津 元一, 河田 聡: "近接場ナノフォトニクスハンドブック" オプトロニクス社, 270 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河田 聡: "超解像の光学" 学会出版センター, 230 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kano and S.Kawata: "Grating-coupled surface plasmon for measuring the refractive index of a liquid sample" Jpn.J.Appl.Phys.34. 331-335 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Kawata and Y.Inouye: "Scanning probe optical microscopy using a metallic probe tip" Ultramicroscopy. 57. 313-317 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Inouye and S.Kawata: "A scanning near-field optical microscope having scanning electron tunneling microscope capability using a single metallic probe tip" Journal of Microscopy. 178. 14-19 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Nakamura and T.Okada: "A two-photon scanning fluorescence microscope with deep UV excitation and near UV detection" Optik. 100. 167-170 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Furukawa and S.Kawata: "Analysis of image formation in a near-field scanning optical microscope : Effects of multiple scattering" Opt..Commun.132. 170-178 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Kawata and T.Tani: "Optically driven Mie particles in an evanescent field along a channeled waveguide" Opt.Lett.21. 1768-1770 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kano and S.Kawata: "Two-photon-excited fluorescence enhanced by a surface plasmon" Opt.Lett.21. 1848-1850 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] B.Hecht, H.Bielefeldt, L.Novotny, Y.Inouye, and D.W.Pohl: "Local excitation, scattering, and interference of surface plasmon" Phy.Rev.Lett.77. 1889-1892 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Inouye and S.Kawata: "Reflection-mode near-field optical microscope with a metallic probe tip for observing fine structures in semiconductor materials" Opt.Commun.134. 31-35 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Maruo, O.Nakamura, and S.Kawata: "Three-dimensional microfabrication with two-photon absorbed photopolymerization" Opt.Lett.22. 132-134 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] B.Hecht, H.Bielefeldt, Y.Inouye, D.W.Pohl and L.Novotny: "Facts and artifacts in near-field optical microscopy" J.Appl.Phys.81. 2492-2498 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Hatano, Y.Inouye, and S.Kawata: "Near-field optical microscope with a multiheight scanning-imaging mode" Opt.Lett.22. 1532-1534 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sugiura, T.Okada, Y.Inouye, O.Nakamura, and S.Kawata: "Gold-bead scanning near-field optical microscope with laser-force position control" Opt.Lett.22. 1663-11665 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Inouye, N.Fujita, W.Bacsa, and S.Kawata: "Localized-field-enhancement for near-field scanning fluorescence imaging" Cell Vision. 4. 162-163 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Nakamura, V.Daria, K.Fujita, Y.Kawata, S.Kawata, C.Palmes-Saloma, and H.Kondoh: "Two-photon Fluorescence Scanning Microscopt of a Turbid Medium" Cell Vision. 4. 163-164 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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