Abstract
A three-dimensional (3D) ring-shaped laser trap has been built using axicons. The diameter of this laser trap ranges from 70 to 140 mum and is adjusted by simply changing the position of one axicon in the optical path. Parallel 3D trapping of 5 mum silica microspheres and 3D confinement of cells along the ring are demonstrated. In this system the special optical properties of axicons are used to create a continuous annular trap with high power efficiency and a constant numerical aperture. This new approach, without any mechanical scanning, offers significant potential for applications in cell motility analysis and biotropism studies.
Highlights
Title Size tunable three-dimensional annular laser trap based on axicons
Single-spot laser trapping analyzes one sperm at a time, lacks the ability of in situ sorting based on motility, and has difficulty in assessing the role of chemotaxis—a critical feature of sperm that is important in infertility and contraceptive approaches.[8]
In this Letter we introduce a new type of optical trapping based on axicons that can be used to manipulate tens to hundreds of microparticles in parallel
Summary
Title Size tunable three-dimensional annular laser trap based on axicons. Size tunable three-dimensional annular laser trap based on axicons
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