表征锥形折射光镊
Characterising Conical Refraction Optical Tweezers
摘要：
当光束通过适当切割的双轴晶体时，就会发生锥形折射。通过聚焦的锥形折射光束通过一个高数值孔径显微镜物镜，锥形折射光镊可以创建，允许在两个拉曼点和劳埃德/波根多夫环的粒子操纵。我们提出了一个彻底的量化这样的光束的捕获性能，专注于陷阱的刚度，这是如何变化的陷阱功率和被困粒子的位置。我们表明，较低的拉曼斑点可以被认为是一个单光束的光学梯度力陷阱，而辐射压力占主导地位的上拉曼斑点，导致光学悬浮，而不是捕获。粒子在劳埃德/Poggendorff环经历较低的陷阱刚度比粒子在较低的拉曼斑点，但受益于旋转控制。
英文摘要：
Conical refraction occurs when a beam of light travels through an appropriately cut biaxial crystal. By focussing the conically refracted beam through a high numerical aperture microscope objective, conical refraction optical tweezers can be created, allowing for particle manipulation in both Raman spots and in the Lloyd/Poggendorff rings. We present a thorough quantification of the trapping properties of such a beam, focussing on the trap stiffness and how this varies with trap power and trapped particle location. We show that the lower Raman spot can be thought of as a single-beam optical gradient force trap, while radiation pressure dominates in the upper Raman spot, leading to optical levitation rather than trapping. Particles in the Lloyd/Poggendorff rings experience a lower trap stiffness than particles in the lower Raman spot but benefit from rotational control.
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