We study the behavior of silicon microparticles in a 1064 nm Gaussian-beam optical tweezers, showing that this semiconductor can be used to perform different types of optical manipulation experiments. Depending on the focal position and the laser power used, the particles can present an oscillatory dynamics in the tweezers or can be stably 3D-trapped with a trap stiffness that allows the application of femtoNewton forces with accuracy. A new, to the best of our knowledge, interpretation based on the photoexcitation of electrons in the valence band is proposed to explain the oscillations, and the quantities associated with such dynamics (e.g., amplitude, period, etc.) were characterized as a function of relevant parameters to optical tweezers setups.

中文翻译：

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硅微粒作为光镊实验的手柄。

我们研究了1064 nm高斯光束光镊中硅微粒的行为，表明该半导体可用于执行不同类型的光操纵实验。取决于焦点位置和所使用的激光功率，粒子可能会在镊子中呈现出振荡动力学，或者可以稳定地进行3D陷波，并具有陷波刚度，从而可以精确地施加毫微微牛顿力。据我们所知，提出了一种基于价带电子的光激发的解释来解释振荡，并且将与这种动力学相关的量（例如，振幅，周期等）表征为一个函数镊子设置相关参数的设置。