Influence of evanescent wave on birefringent microplates

Abstract

Mechanical action caused by the optical forces connected with the canonical momentum density associated with the local wavevector or Belinfante's spin angular momentum is experimentally verified. The helicity-dependent and the helicity-independent forces determined by spin momenta of different nature open attractive prospects for the use of optical structures for manipulating minute quantities of matter of importance in nanophysics, nanooptics and nanotechnologies, precision chemistry and pharmacology and in numerous other areas. Investigations in this area reveal new, extraordinary manifestations of optical forces, including the helicity-independent force caused by the transverse helicity-independent spin or vertical spin of a diagonally polarized wave, which was not observed and exploited up to recently. The main finding of our study consists in a direct experimental demonstration of the physical existence and mechanical action of this recently discovered extraordinary transverse component of the spin here arising in an evanescent light wave due to the total internal reflection of a linearly polarized probing beam with azimuthal angle 45° at the interface between the birefringent plate and air, which is oriented perpendicularly to the wavevector of an evanescent wave and localized over the boundary of the transparent media with polarization-dependent refraction indices. Dennis, A. Y. Bekshaev, K. Y. Bliokh, and F. Nori, "Direct measurements of the extraordinary optical momentum and transverse spin-dependent force using a nano-cantilever," Nat. Phys. 12(8), 731-735 (2016). 12. A. Aiello, P. Banzer, M. Neugebauer, and G. Leuchs, "From transverse angular momentum to photonic wheels," Nat.

Peculiarities of control of erythrocytes moving in an evanescent field

“…Complex geometry of a surface and surface inhomogeneities may considerably reinforce the optical forces and cause appearance of new components connected, in part, with manifestation of the extraordinary vertical spin angular momentum of an evanescent wave. 16 Miniaturization of the optical traps leads to creation of controlled microspheres, which act as micropumps and switches. From this standpoint, the paper 17 is of special interest devoted to the study of the behavior of microparticles located at the distances of a few micrometers from a surface, viz.…”

Influence of components of optical momentum and spin of evanescent waves on micro- and nanoobjects (Review)

“…Вектор напруженості електричного поля еванесцентної хвилі, що виникає над межею поділу, може бути представлений у вигляді [9,49]: , -показники заломлення першого та другого середовища відповідно; , , , , -орти координатних осей та значення координат в декартовій системі координат; -уявна одиниця; -циклічна частота; -час.…”

“…Динамічні характеристики еванесцентного поля, такі, як густина імпульсу чи спіну, мають складну структуру розподілу, що залежить від поляризації падаючого пучка [9,12]. Густина орбітального імпульсу еванесцентного поля може бути задана, як [9,49]:…”

Controlling and manipulation of red blood cells by evanescent waves

“…Here k z is the propagation constant, κ is the exponential decay rate, m is the state of polarization of an evanescent wave [22,23], and:…”

“…The magnitudes of the components of the refracted evanescent wave at each facet are used for obtaining the estimation of the spin orbital momentum density and the orbital angular momentum density in the longitudinal and transversal directions. The spin angular momentum density in this case is expressed as [22][23][24] Here is the transmitted evanescent wave interacting with the i-th facet of the erythrocyte. This expression contains both the longitudinal and transversal components [17].…”