Pico-Newton Friction Force Measurements Using a Laser-trapped Microsphere
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概要
- 論文の詳細を見る
We have developed a system for measuring the force of friction by using the technique of laser-trapping. A polystyrene microsphere of a 3μm diameter is trapped in a water layer using a focused near infrared laser. While the sample is scanned, all of the viscous, friction, and radiation forces are induced in the microsphere. The friction force acting on the microsphere is estimated by the viscous force obtained from the scanning speed of the stage using Stokes law, and the radiation force is obtained by the displacement of the microsphere. We demonstrate experimentally the existence of a linear relationship between the force of radiation and the displacement. We found that the value of the spring constant of the radiation force is 7.2μN/m.Furthermore, we measured both the friction force acting on the probe on a flat quartz substrate surface and that at the edge of small steps. The magnitude of these forces are 0.88 pN and 1.23 pN, respectively.
- 社団法人応用物理学会の論文
- 1998-06-01
著者
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KAWATA Satoshi
Department of Chemistry, Graduate School of Science, Osaka University
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NAKAMURA Osamu
Department of Radiological Technology, Faculty of Health Sciences, Nihon Institute of Medical Scienc
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Kawata Satoshi
Department Of Applied Physics Graduate School Of Engineering Osaka University
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INOUYE Yasushi
Department of Applied Physics, Osaka University
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Inouye Yasushi
Department Of Applied Physics Osaka University
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SHOJI Satoru
Department of Internal Medicine, Sendai Kosei Hospital
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Shoji Satoru
Department Of Applied Physics Osaka University
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FURUKAWA Hiromitsu
Department of Applied Physics, Osaka University
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Furukawa Hiromitsu
Department Of Applied Physics Osaka University
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Kawata Satoshi
Department Of Appkied Physicy Osaka University
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Nakamura Osamu
Department Of Applied Physics Osaka University
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Kawata Satoshi
Department of Applied Physics, Osaka University
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