| Project/Area Number |
06555067
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Dynamics/Control
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| Research Institution | University of Tokushima |
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Principal Investigator |
YOSHIMURA Toshio Faculty of Engineering, University of Tokushima, Professor, 工学部, 教授 (90035618)
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| Co-Investigator(Kenkyū-buntansha) |
MISAWA Hiroaki Faculty of Engineering, University of Tokushima, Professor, 工学部, 教授 (30253230)
ARAKI Tsutomu Faculty of Engineering, University of Tokushima, Professor, 工学部, 教授 (50136214)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥8,800,000 (Direct Cost: ¥8,800,000)
Fiscal Year 1995: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1994: ¥6,900,000 (Direct Cost: ¥6,900,000)
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| Keywords | microsensor / lasing particle / laser manipulation / laser trapping / photon tunneling / ellipsoidal particle / biocell sensor |
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| Research Abstract |
Microparticles such as liquid droplets, polymer particles and so forth are known to be able to act as an optical cavity for lasing of a luminescent dye where the luminescence propagates circumferentially just inside of the surface of the particle. We recently observed lasing light in the particle leak to the closely-positioned particle through the evanescent field ; photon tunneling from the lasing to nonlasing particles. This fact suggests that lasing microparticles can be utilized for a microsensor by monitoring the emission spectrum and intensity. To apply the lasing particles as microsensors for monitoring of local environment, precise positioning control and manipulation of the particles are necessary. Among various manipulation techniques, laser manipulation is one of the potential candidates for noncontact and nondestructive positioning control of microparticles. In this research project, we attempted that simultaneous three-dimensional optical manipulation and lasing of ellipsoidal-shaped, rhodamine B (RhB)-doped poly (methyl methacrylate) (PMMA) latex particles in water.
Emission spectra from an optically-trapped ellipsoidal RhB-PMMA particle in water were observed. The wavelength of laser emission peaks from the particle strongly depended on th position of focused pumping laser on the particle, and it was contrary to the behavior of spherical lasing particle. This means that the resonant wavelength of the particle varies with the position of the particle. Furthermore, we demonstrated photon tunneling between the lasing and nonlasing particles on the basis of the laser scanning manipulation technique. These facts indicate that simultaneous laser trapping and lasing of individual ellipsoidal microparticles provide versatile microsensors for monitoring local environment.
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