首页|A vectorial model for the nonlinear gradient force exerted on metallic Rayleigh nanoparticles
A vectorial model for the nonlinear gradient force exerted on metallic Rayleigh nanoparticles
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Optical tweezers have proved to be a powerful tool with a wide range of applications.The gradient force plays a vital role in the stable optical trapping of nano-objects.The scalar method is convenient and effective for analyzing the gradient force in traditional optical trapping.However,when the third-order nonlinear effect of the nano-object is stimulated,the scalar method cannot adequately present the optical response of the metal nanoparticle to the external optical field.Here,we propose a theoretical model to interpret the nonlinear gradient force using the vector method.By combining the optical Kerr effect,the polarizability vector of the metallic nanoparticle is derived.A quantitative analysis is obtained for the gra-dient force as well as for the optical potential well.The vector method yields better agreement with reported experimental observations.We suggest that this method could lead to a deeper understanding of the physics relevant to nonlinear optical trapping and binding phenomena.
Research Center for Humanoid Sensing,Research Institute of Intelligent Sensing,Zhejiang Lab,Hangzhou 311100,China
Nanophotonics Research Center,Institute of Microscale Optoelectronics & State Key Laboratory of Radio Frequency Heterogeneous Integration,Shenzhen University,Shenzhen 518060,China
Optics Research Group,ImPhys Department,Faculty of Applied Sciences,Delft University of Technology,Delft 2628 CJ,The Netherlands
Key Research Project of Zhejiang LabGuangdong Major Project of Basic and Applied Basic Research国家自然科学基金国家自然科学基金国家自然科学基金深圳市科技计划深圳市科技计划广东省自然科学基金Shenzhen Peacock Plan
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