光阱中单轴方解石单晶的平衡位置
Equilibrium positions of optically-trapped single-crystal uniaxial calcite
AI总结：
本研究展示了光镊对无双折射对称轴的方解石单晶在三维平移和旋转自由度上的控制，基于感应极化与入射电场相互作用的扭矩模型，确定了晶体在平衡状态下的位置，计算结果与实验观察一致。
摘要：
光学微操纵的精度对于利用光对物体进行无创、非接触控制以及利用光测量力和扭矩至关重要。我们展示了对双折射物体在三个平移方向和三个旋转自由度上的控制。我们对方解石（一种没有对称轴的独特晶体）的捕获和旋转工作，扩展了光镊的定位能力。我们在线偏振光中捕获并悬浮单晶，并将其定位在相对于偏振的三个旋转方向上。我们关于晶体上扭矩的模型基于确定感应极化及其与入射电场的相互作用。结果表明，晶体在平衡状态下静止时，其光轴沿光束轴方向，且一个非常光轴沿偏振方向。计算得出的平衡位置与我们对稳定捕获方解石的观察结果一致。
英文摘要：
Precision in optical micromanipulation is critical for non-invasive, non-contact control of objects with light and for using light to measure forces and torques. We demonstrate the control of birefringent objects over three translational directions and three rotational degrees of freedom. Our work trapping and rotating calcite, a unique crystal with no axis of symmetry, extends the positioning abilities of optical tweezers. We trap and levitate a single crystal in linearly polarized light and position it in three rotational directions relative to the polarization. Our model of the torque on the crystals is based on determining the induced polarization and its interaction with the incident electric field. Crystals are shown to rest in equilibrium with their optic axis along the beam axis and one extraordinary axis along the direction of polarization. The calculated equilibrium positions align with our observations of stable trapped calcite.
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