Dr. Hidekazu Ishitobi Profile

Dr. Hidekazu Ishitobi

at Osaka University

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 20 August 2020 Presentation

Polymer movement induced by two-color light

Hidekazu Ishitobi, Yasushi Inouye

Proceedings Volume 11477, 114770F (2020) https://doi.org/10.1117/12.2568373

KEYWORDS: Polymers, Polymer thin films, Collimation, Atomic force microscope

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Proceedings Article | 10 September 2019 Presentation

Observation for conformation change of DNA via local surface plasmon resonance (Conference Presentation)

Yasushi Inouye, Kyoko Masui, Hidekazu Ishitobi

Proceedings Volume 11098, 110980H (2019) https://doi.org/10.1117/12.2528971

KEYWORDS: Surface plasmons, Plasmons, Gold, Nanoparticles, Calibration

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Proceedings Article | 19 September 2018 Presentation + Paper

Plasmonic coupled modes in metal-insulator-metal structures for sensing applications

N. Andam, S. Refki, S. Hayasi, A. Rahmouni, H. Ishitobi, D. Nesterenko, Y. Inouye, Z. Sekkat

Proceedings Volume 10722, 107220O (2018) https://doi.org/10.1117/12.2319936

KEYWORDS: Sensors, Gold, Glucose, Plasmonics, Photonics, Interfaces, Surface plasmons, Reflectivity, Structural sensing, Metals

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Proceedings Article | 18 September 2018 Presentation

Photochemical imaging of plasmonically enhanced near-fields using light-induced mass transport in azo-polymer films (Conference Presentation)

Hidekazu Ishitobi

Proceedings Volume 10740, 107400B (2018) https://doi.org/10.1117/12.2317375

KEYWORDS: Near field, Near field optics, Polymers, Polarization, Spatial resolution, Resonance enhancement, Polymer thin films, Optical storage, Optical imaging, Diffraction

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Proceedings Article | 17 September 2018 Presentation

Fluorescent Pt nanoclusters and their application to bio-imaging (Conference Presentation)

Hidekazu Ishitobi, Kyoko Masui, Yasushi Inouye

Proceedings Volume 10722, 107220Y (2018) https://doi.org/10.1117/12.2320156

KEYWORDS: Platinum, Nanoparticles, Luminescence, Receptors, Nanostructures, Chemical species, Plasmonics, Polymers, Cancer, Proteins

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Proceedings Article | 10 November 2016 Presentation

Optical tweezing by photochemistry (Conference Presentation)

Zouheir Sekkat, Satoshi Kawata, Yasushi Inouye, Hidekazu Ishitobi

Proceedings Volume 9922, 99221M (2016) https://doi.org/10.1117/12.2236628

KEYWORDS: Optical trapping, Photochemistry, Optical manipulation, Optical tweezers, Diffusion, Optical micromanipulation, Current controlled current source

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Proceedings Article | 9 November 2016 Presentation

Fano resonances arising from coupled surface plasmon polariton and waveguide modes (Conference Presentation)

Zouheir Sekkat, Shinji Hayashi, Dmitry Nesterenko, Anouar Rahmouni, Hidekazu Ishitobi, Yasushi Inouye, Satoshi Kawata

Proceedings Volume 9921, 99210K (2016) https://doi.org/10.1117/12.2236682

KEYWORDS: Surface plasmon polaritons, Waveguide modes, Planar waveguides, Electromagnetism, Plasmonics, Scientific research, Current controlled current source

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Proceedings Article | 3 November 2016 Presentation

On the theory of photomigration (Conference Presentation)

Zouheir Sekkat, Satoshi Kawata, Hidekazu Ishitobi, Yasushi Inouye

Proceedings Volume 9939, 993908 (2016) https://doi.org/10.1117/12.2236623

KEYWORDS: Polymers, Optical manipulation, Optical trapping, Polarization, Scientific research, Organic materials, Current controlled current source

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Proceedings Article | 8 September 2011 Open Access

Single-, two-, and multi-photon driven molecular motion and nanopatterning in azo-polymer films

Zouheir Sekkat, Hidekazu Ishitobi, Mamoru Tanabe, Tsunemi Hiramatsu, Satoshi Kawata

Proceedings Volume 8113, 81130N (2011) https://doi.org/10.1117/12.890511

KEYWORDS: Polymers, Polarization, Polymer thin films, Atomic force microscopy, Near field, Near field optics, Diffraction, Absorption, Optical lithography, Glasses

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We review our work on nanopatterning in azo-polymer films by single, two- and multi-phopton driven molecular motion in solid bulk polymer. It is now known that light induced molecular movement occurs below the polymer glass transition temperature by chromophores photoisomerization via either linear or nonlinear absorption, and in this paper we will show that nanoscale polymer movement is induced by a tightly focused laser beam in an azo-polymer film just at the diffraction limit of light. The deformation pattern which is produced by photoisomerization of the azo dye is strongly dependent on the incident laser polarization and the longitudinal focus position of the laser beam along the optical axis. The anisotropic nanofluidity of the polymer film and the optical gradient force played important roles in the light induced polymer movement. We explored the limits of the size of the photo-induced deformation, and we found that the deformation depends on the laser intensity and the exposure time. The smallest deformation size achieved was 200 nm in full width of half maximum; a value which is nearly equal to the size of the diffraction limited laser spot. Furthermore, a nano protrusion was optically induced on the surface of the films, beyond the limit of light diffraction, by metal tip enhanced near-filed illumination. A silver coated tip was located inside the diffraction limited spot of a focused laser beam (460 nm), and an enhanced near-field, with 30 nm light spot, was generated in the vicinity of the tip due to localized surface plasmons. The incident light intensity was carefully regulated to induce surface nanodeformation by such a near-field spot. A nano protrusion with 47 nm full width of half maximum and 7 nm height was induced. The protrusion occurs because the film is attracted towards the tip end during irradiation. At the top of the protrusion, an anisotropic nanomovement of the polymer occurs in a direction nearly parallel to the polarization of the incident light, and suggests the existence at the tip end of not only a longitudinal, i.e., along the tip long axis, but also a lateral component of the electric field of light. The azo-polymer film helps map the electric field in the close vicinity of the tip. We also report on two-photon patterning of the films. Exposure of azo polymer films, which absorb in the visible range (λ_max = 480 nm), to intense 920 nm irradiation leads to polarization dependent patterning which are associated with polymer nanomovement caused by photoselective two-photon cis ↔ trans isomerization, while irradiation at 780 nm induces multi-photon bleaching of the azo chromophore. These wavelengths hit bleaching and isomerization pathways in the chromophore, respectively.

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Proceedings Article | 18 August 2005 Paper

Molecular orientation by two-photon absorption

H. Ishitobi, M. Maeda, Z. Sekkat, S. Kawata

Proceedings Volume 5935, 59350F (2005) https://doi.org/10.1117/12.611185

KEYWORDS: Absorbance, Absorption, Polarization, Chromophores, Polymethylmethacrylate, Anisotropy, Microscopes, Ultraviolet radiation, Visible radiation, Laser beam diagnostics

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Proceedings Article | 29 November 2000 Paper

Photo-orientation movement of photoisomerizable chromophores: quantifying analytical theory and application to spectrally overlapping and distinguishable isomers

Zouheir Sekkat, Hidekazu Ishitobi, Daisuke Yasumatsu, Satoshi Kawata

Proceedings Volume 4106, (2000) https://doi.org/10.1117/12.408499

KEYWORDS: Chromophores, Polymers, Ultraviolet radiation, Surface plasmons, Absorbance, Anisotropy, Polymethylmethacrylate, Visible radiation, Absorption, Nonlinear optics

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Proceedings Article | 7 May 1999 Paper

Optically oriented isomers of diarylethene and spiropyran in polymeric thin films

Hidekazu Ishitobi, Zouheir Sekkat, Satoshi Kawata

Proceedings Volume 3740, (1999) https://doi.org/10.1117/12.347740

KEYWORDS: Chromophores, Ultraviolet radiation, Surface plasmons, Visible radiation, Polymer thin films, Near field optics, Polymers, Absorption, Anisotropy, Polarization

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Proceedings Article | 7 May 1999 Paper

Three-dimensional optical recording with the ferroelectric domain reversal in a Ce-doped SBN:75 crystal: experiment and calculation

Masaki Hisaka, Hidekazu Ishitobi, Satoshi Kawata

Proceedings Volume 3740, (1999) https://doi.org/10.1117/12.347737

KEYWORDS: Crystals, Polarization, Refractive index, Laser crystals, Holography, Optical recording, Computer simulations, Optical storage, Microscopes, Photorefraction

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Showing 5 of 13 publications

Conference Committee Involvement (7)

Molecular and Nanophotonic Machines, Devices, and Applications VII

18 August 2024 | San Diego, California, United States

Molecular and Nanophotonic Machines VI

22 August 2023 | San Diego, California, United States

Molecular and Nano Machines V

21 August 2022 | San Diego, California, United States

Molecular and Nano Machines IV

3 August 2021 | San Diego, California, United States

Molecular and Nano Machines III

24 August 2020 | Online Only, California, United States

Showing 5 of 7 Conference Committees

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