Abstract
We present tailoring of three dimensional light fields which act as light moulds for elaborate particle micro structures of variable shapes. Stereo microscopy is used for visualization of the 3D particle assemblies. The powerful method is demonstrated for the class of propagation invariant beams, where we introduce the use of Mathieu beams as light moulds with non-rotationally-symmetric structure. They offer multifarious field distributions and facilitate the creation of versatile particle structures. This general technique may find its application in micro fluidics, chemistry, biology, and medicine, to create highly efficient mixing tools, for hierarchical supramolecular organization or in 3D tissue engineering.
Highlights
Any application of laser radiation has its specific demand on the beam shape revealed in certain intensity or phase distributions, polarization, momentum and propagation properties
We demonstrate the use of Mathieu beams as tailored light moulds for the 3D arrangement of spherical and non-spherical micro particles
We show the implementation of even Mathieu beams in optical tweezers and create 3D particle arrangements in the developed light moulds
Summary
Any application of laser radiation has its specific demand on the beam shape revealed in certain intensity or phase distributions, polarization, momentum and propagation properties. Light moulds have to meet two criteria: transversal diversity combined with self-healing properties for longitudinal invariance to enable extensive structures. Both criteria have been separately demonstrated [9, 10]. In the approach presented here, we realize a combination of both criteria using propagation invariant beams with self-healing properties having complex transverse field distributions. The class of Mathieu beams are especially well-suited due to their variety of transverse, non-diffracting structure that allows a variety of 3D applications for moulding light fields to organize particles or matter. We demonstrate the use of Mathieu beams as tailored light moulds for the 3D arrangement of spherical and non-spherical micro particles
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