Details

Autor(en) / Beteiligte

• Zhan, Qiwen

Titel

Trapping metallic Rayleigh particles with radial polarization

Ist Teil von

• Optics express, 2004-07, Vol.12 (15), p.3377-3382

Ort / Verlag

United States

Erscheinungsjahr

2004

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Metallic particles are generally considered difficult to trap due to strong scattering and absorption forces. In this paper, numerical studies show that optical tweezers using radial polarization can stably trap metallic particles in 3-dimension. The extremely strong axial component of a highly focused radially polarized beam provides a large gradient force. Meanwhile, this strong axial field component does not contribute to the Poynting vector along the optical axis. Consequently, it does not create axial scattering/absorption forces. Owing to the spatial separation of the gradient force and scattering/absorption forces, a stable 3-D optical trap for metallic particles can be formed.