Abstract
The paper summarizes the latest obtained results illustrating the rectilinear and rotational motion of micro-objects in a biological environment. Such a motion is stipulated by the action of the optical force, on the one hand, and the special influence of the toque of the evanescent wave, on the other one. The reason of this unusual action is the presence of a transverse spin component of the evanescent wave. This feature appears due to the method of excitation: a linearly polarized wave with the azimuth of polarization of 45° at total internal reflection (TIR) at the interface of a prism and a biological medium is used. The objects of the study were gold micro-particles located in a biological environment and red blood cells (RBC) in blood plasma. We demonstrate the possibility for controlling these objects using an evanescent wave under specially selected experimental conditions. The obtained results are highly relevant in modern pharmacology and biomedicine.
Highlights
At the turn of the 20th and 21st centuries, structured optical beams became especially attractive because they possess the unique properties that allow them to be used in modern technologies for manipulating micro and nano-objects by controlling the parameters of the beam itself.Recent studies [1,2,3], devoted to the investigation of evanescent waves, have revealed a set of properties that demonstrate the extraordinary action of these waves
Let us consider the influence of the transverse spin of an evanescent wave on the objects of investigation, revealed by the action of the optical force component in the transverse direction on gold particles, that are usually localized over a section of biological tissue and used as a transfer element of the micro-dose of medicine for potential medical applications
A distinctive feature of the results presented at this paper is the demonstration of the controlled motion of erythrocytes by an evanescent wave in a transverse direction that differs from the Poynting vector orientation that coincides with the direction of wave propagation
Summary
Reviewed by: Abdollah Hassanzadeh, University of Kurdistan, Iran Pradeep Kumar Gupta, Raja Ramanna Centre for Advanced. Specialty section: This article was submitted to Optics and Photonics, a section of the journal
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