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Improvement of trapping efficiency of Rayleigh particles using elliptical coaxial apertures

机译:使用椭圆形同轴孔径提高瑞利粒子的捕获效率

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Plasmonic optical tweezers are the most promising candidates to overcome the diffraction limits imposed by conventional optical traps and high power levels to trap dielectric nanoparticles. In this paper we report the improved efficiency of the trap for sub-10 nm dielectric objects (Rayleigh particles) using elliptical coaxial apertures with and eccentricity of 0.85 when excited with linearly polarized light. The high intensification of the electric field at the ends of the semi-major axis of the elliptical structure allows a better localization of the hot spot that generates the unstable and almost isotropic optical force. Our simulations results show that the elliptical structure needs only 2mW of excitation power light to trap a Rayleigh particle in benzene solvent.
机译:等离子光镊是克服常规光阱和高能级以捕获介电纳米颗粒的衍射极限的最有前途的候选者。在本文中,我们报道了当使用线性偏振光激发时,使用偏心率为0.85的椭圆形同轴孔径,对于10 nm以下的电介质(瑞利粒子)捕获器的效率提高。椭圆结构的半长轴末端的电场高度增强,可以更好地定位热点,从而产生不稳定且几乎各向同性的光学力。我们的模拟结果表明,椭圆形结构仅需要2mW的激发功率光即可将瑞利粒子捕获在苯溶剂中。

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