Department of Physics
Optimized optical “tractor beam” for core–shell nanoparticles
It is known that core–shell subwavelength nanoparticles consisting of a dielectric shell and a metallic core can simultaneously support electric and magnetic dipolar resonances, which enhance forward scattering and suppress backward scattering. This creates favorable conditions for optical tractor beam applications. Using the generalized Lorenz–Mie theory and Maxwell stress tensor formulation, we demonstrate how optical pulling forces can be induced and optimized by first-order Bessel beams with appropriate polarization. The transverse stability of the core–shell nanoparticle under ambient damping is also verified by linear stability analysis and dynamical simulation.
Optical Society of America
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This work was supported by the China 973 Project (Nos. 2011CB922004 and 2013CB632701) and the China National Natural Science Foundation (No. 11174059). JN was also supported by HKBU 604011 and HKUST2/CRF/ 11G.
Link to Publisher’s Edition
Wang, Neng, Wanli Lu, Tsz Fai Jack Ng, and Zhifang Lin. "Optimized optical “tractor beam” for core–shell nanoparticles." Optics Letters 39.8 (2014): 2399-2402.