Laser Science of a Single Microparticle. Novel Laser-Induced Ejection Phenomenon of Single Polymeric Microspheres.
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概要
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Polymeric microspheres ranging from 2 to 60μm were doped with anthracene or coated with a Cuphthalocyanine derivative, being adhered on quartz plates, were irradiated with a nanosecond pulsed laser in air. Ejection behavior of the spheres was studied by nanosecond photography. Even when one single sphere was irradiated, its ejection was confirmed to take place. Irradiation of cohesive films of microspheres also induced explosive ejection of spheres. It was found that the ejection starts with a certain retention period after laser pulse irradiation. The retention period falls in the range from sub to tens of is, depending on the excitation wavelength, laser fluence, the size of spheres and the concentration of photo-absorbing molecules at the sphere surface. This suggests that photothermal expansion of spheres induce a movement of the center of mass in a short time range, which yields a force overcoming their adhesion to the surface of quartz plates. It was also demonstrated that one single sphere can be selectively ejected from a cohesive film of microspheres by laser irradiation under a microscope.
- 社団法人 レーザー学会の論文
社団法人 レーザー学会 | 論文
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