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Waveguide trapping of hollow glass spheres

机译:空心玻璃球的波导捕获

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摘要

Microparticles can be trapped and propelled by the evanescent field of optical waveguides. As the evanescent field only stretches 100-200 nm from the surface of the waveguide, only the lower caps of the microparticles interact directly with the field. This is taken advantage of by trapping hollow glass spheres on waveguides in the same way as solid glass spheres. For the chosen waveguide, numerical simulations show that hollow microspheres with a shell thickness above 60 nm can be stably trapped, while spheres with thinner shells are repelled. The average refractive index of the sphere-field intersection volume is used to explain the result in a qualitative way.
机译:微粒可以被光波导的渐逝场捕获并推动。由于the逝场仅从波导表面延伸100-200 nm,因此只有微粒的下盖直接与该场相互作用。通过以与实心玻璃球相同的方式将空心玻璃球捕获在波导上来利用这一点。对于所选的波导,数值模拟表明,壳厚度大于60 nm的空心微球可以被稳定捕获,而壳更薄的球则被排斥。球场相交体积的平均折射率用于定性解释结果。

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