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Analysis and Calculation of the Optical Force on a Double-Layer Dielectric Sphere

Yao Xincheng Li Zhaolin Cheng Bingying Zhang Daozhong ( Optical Physics L aboratory,Institute of Physics and Center for Condensed Matter Physics, The Chinese Academy of Sciences,Beijing1 0 0 0 80 )  
Optical force was calculated for a double- layer dielectric sphere. Results indicate that the optical force was determined by the relative refractive index and thickness of the two layers.Especially,when the refractive index of the innerlayeris higherthan thatof the outerlayer,a smallerregion,where the trapping stiffness is improved effectively,can be achieved with the reducing of the radius of the inner layer,and the double- layer dielectric sphere can be confined stably in this region.In comparison,if the index of refraction of the inner layeris lowerthan thatof the outerlayer,two stable equilibrium positions may be found when the inner radius decreases.
【Fund】: 国家自然科学基金!(1989380 )资助项目
【CateGory Index】: O435
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