Rotation of Optically Trapped Particles in Air

We have demonstrated optically induced rotation of microscopic dielectric particles in air. The particles were anisotropically shaped, and were simultaneously trapped three-dimensionally and rotated about the beam axis, which depended solely on the radiation pressure of an extremely focused laser li...

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Veröffentlicht in:Japanese Journal of Applied Physics 1999-07, Vol.38 (7A), p.L743
Hauptverfasser: Omori, Ryota, Shima, Kotaro, Suzuki, Atsuyuki
Format: Artikel
Sprache:eng
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Zusammenfassung:We have demonstrated optically induced rotation of microscopic dielectric particles in air. The particles were anisotropically shaped, and were simultaneously trapped three-dimensionally and rotated about the beam axis, which depended solely on the radiation pressure of an extremely focused laser light. It was observed that the rotational speed was linearly dependent on the irradiated beam power and the slope of the fitting lines revealed up to 860 rpm/mW for 3.0 µm-diameter-particles and 540 rpm/mW for 4.0 µm-diameter-particles, which was much higher than the previously reported values measured in water. This technique will be useful for micromotors and microfans assembled in microelectromechanical systems.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.38.L743