Abstract
A scalar polymorphic beam is designed with independent control of its intensity and phase along a strongly focused laser curve of arbitrary shape. This kind of beam has been found crucial in the creation of freestyle laser traps able to confine and drive the motion of micro/nano-particles along reconfigurable 3D trajectories in real time. Here, we present and experimentally prove the concept of vector polymorphic beam adding the benefit of independent design of the light polarization along arbitrary curves. In particular, we consider polarization shaped tangential and orthogonal to the curve that are of high interest in optical manipulation and laser micromachining. The vector polymorphic beam is described by a surprisingly simple closed-form expression and can be easily generated by using a computer generated hologram.
Highlights
Shaping a coherent laser beam with independent control of its intensity, phase and polarization is a long posted problem of high interest in science and technology
Numerous vector beams have been created by using this approach[12,13,14,15,16], the challenging problem of the design and generation vector beams strongly focused in form of a diffraction-limited light curve of arbitrary shape with independent control of its intensity, phase and polarization distributions along it has not been completely solved
In this work we present a kind of vector beam, referred to as vector polymorphic beam, that solves this challenging problem of beam shaping
Summary
A scalar polymorphic beam is designed with independent control of its intensity and phase along a strongly focused laser curve of arbitrary shape. Numerous vector beams have been created by using this approach[12,13,14,15,16], the challenging problem of the design and generation vector beams strongly focused in form of a diffraction-limited light curve of arbitrary shape with independent control of its intensity, phase and polarization distributions along it has not been completely solved. In this work we present a kind of vector beam, referred to as vector polymorphic beam, that solves this challenging problem of beam shaping It is based on its scalar analogous beam[21], which can be strongly focused in form of diffraction-limited light curve of arbitrary shape with the following key properties: high 3D intensity gradients, independent design of the intensity and phase distributions (both of them can be arbitrary) along the curve according to the considered application.
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