Abstract
Three dimension multiparticle optical trapping and dynamic manipulation in a pre-defined fashion is a routine affair often realized by spatio-temporal modulation of fundamental Gaussian beam either using lens or diffractive optical elements (DOE). We present multi-particle trapping which is achieved due to cumulative effects of both the beam arbitrariness and constructive interference arising from scrambling of beam outwardly from trapped polystyrene spheres. The arbitrary mode is generated from diode pumped solid state source due to cavity imperfections per-se. The prime motivation of this article is to establish the usability of arbitrary mode in arranging as external optics in OTs for achieving colloidal clusters of microspheres from which forwardly scattered light can be utilized as feedback in shaping the wavefronts to be focused in highly turbid media. In general, it offers overall cost-cutting of experimental set-up and particularly suitable for fundamental demonstration of trapping to undergraduates only.
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