Abstract
Recently, there has been increased interest in the shaping of light fields with an inverse energy flux to guide optically trapped nano- and microparticles towards a radiation source. To generate inverse energy flux, non-uniformly polarized laser beams, especially higher-order cylindrical vector beams, are widely used. Here, we demonstrate the use of conventional and so-called generalized spiral phase plates for the formation of light fields with an inverse energy flux when they are illuminated with linearly polarized radiation. We present an analytical and numerical study of the longitudinal and transverse components of the Poynting vector. The conditions for maximizing the negative value of the real part of the longitudinal component of the Poynting vector are obtained.
Highlights
The ability to shape light fields with the desired complex structure, so-called structured laser beams, plays an important role in the field of laser manipulation for implementing optical tweezers with advanced functionality
Structured laser beams with the predetermined amplitude, phase, and polarization distributions play an important role in the field of laser manipulation
We demonstrated the possibility to form light fields with an inverse energy flux and control the distributions of the real and imaginary parts of the Poynting vector, using conventional and generalized spiral phase plate (GSPP) illuminated with linearly polarized laser radiation
Summary
The ability to shape light fields with the desired complex structure, so-called structured laser beams, plays an important role in the field of laser manipulation for implementing optical tweezers with advanced functionality. Conventional optical tweezers are unique tools that use a strongly focused Gaussian laser beam for the trapping and three-dimensional confinement of nano- and microparticles. Structured optical tweezers, called holographic optical tweezers (HOT), provide more possibilities for laser manipulation due to the possibility of controlling the local distribution of the optical forces acting on the particles located in such a light field. Laser beams with an inverse energy flux have attracted researchers’ attention. Such light fields allow the optically trapped particle to be pulled towards the radiation source, i.e., in the direction opposite to field propagation
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