We show that if a dielectric nanoparticle (with a diameter of ∼70 nm) is placed on the optical axis near the surface (at a distance of less than 100 nm) of a high-aperture silicon gradient microlens with a refractive index in the form of a hyperbolic secant, and the lens is illuminated by laser radiation with a wavelength of 1.55 μ m, then the particle is attracted to the lens surface with a force of a fraction of a piconewton. If there is a nanohole in the lens output surface, then the nanoparticle is pulled into it. This represents a kind of an ‘optical magnet.’ If a reverse energy flow is formed on the optical axis near the output surface of a gradient lens, then its presence leads to the fact that a dielectric nanoparticle with absorption will be ‘attracted’ to the surface with a greater force than a similar particle without absorption. In the absence of a reverse flow, both particles (with and without absorption) are attracted equally. We show also that in the nanohol...

中文翻译：

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在梯度透镜焦点附近的反向能量流中，作用在粒子上的光学力

我们表明，如果将电介质纳米粒子（直径约为70 nm）放置在光轴上靠近折射率（其形式为）的高孔径硅梯度微透镜的表面（距离小于100 nm）上用双曲正割曲线切割透镜，然后用波长为1.55μm的激光辐射照亮透镜，然后以微微微微分之一的力将颗粒吸引到透镜表面。如果透镜出射表面上有纳米孔，则将纳米颗粒拉入其中。这代表了一种“光学磁铁”。如果在梯度透镜的输出表面附近的光轴上形成反向能量流，则其存在会导致以下事实：具有吸收作用的电介质纳米粒子将以比没有接触粒子的相似粒子更大的力“吸引”到表面吸收。在没有逆流的情况下，两个颗粒（有吸收和无吸收）都被同等吸引。我们还表明，在纳米醇中...