期刊
OPTICS EXPRESS
卷 18, 期 6, 页码 5802-5808出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.005802
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资金
- FAPESP - Fundacao de Amparo a Pesquisa e ao Ensino do Estado de Sao Paulo (CePOF, Optics and Photonics Research Center) [2005/51689-2]
- CNPq - Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [151090/2009-2]
The unexpected fact that a spherical dielectric particle with refractive index higher than the surrounding medium will not always be attracted towards high intensity regions of the trapping beam is fully demonstrated here using a simple ray optics approach. This unusual situation may happen due to the inversion of gradient forces, as shown here. Therefore, conventional schemes, such the one based on the use of two counter-propagating beams to cancel the scattering forces, will fail to trap the particle. However, effective trapping still can be obtained by adopting suitable incident laser beams. (C) 2010 Optical Society of America
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