Abstract
Manipulation of micro- and nano-sized objects with optical tweezers is a well-established, albeit still evolving technique. While many objects can be trapped directly with focused laser beam(s), for some applications indirect manipulation with tweezers-operated tools is preferred. We introduce a simple, versatile micro-tool operated with holographic optical tweezers. The 40 µm long dumbbell-shaped tool, fabricated with two-photon laser 3D photolithography has two beads for efficient optical trapping and a probing spike on one end. We demonstrate fluids viscosity measurements and vibration detection as examples of possible applications.
Highlights
Optical tweezers use the phenomenon of optical trapping to manipulate small objects in microscale
Various micro-tools have been demonstrated [4,5,6,7,8,9] that expand the concept of optical trapping and manipulation beyond the simplest micro-beads
The micro-dumbbells are controlled using the two beads trapped in laser beams
Summary
Optical tweezers use the phenomenon of optical trapping to manipulate small objects in microscale. Instead of trapping the object itself, micro-tools can be held and operated by optical tweezers. Since spherical shapes provide the most stable trapping, the so-called micro-beads of various sizes and materials are employed to this end. Various micro-tools have been demonstrated [4,5,6,7,8,9] that expand the concept of optical trapping and manipulation beyond the simplest micro-beads.
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