Photonic Hall effect in ferrofluids: Theory and experiments

Abstract

An experimental and theoretical study on the photonic Hall effect (PHE) in liquid and gelled samples of ferrofluids is presented. The ferrofluids are aqueous colloidal suspensions of Fe2CoO4 particles, which can be considered as anisotropic and absorbing Rayleigh scatterers. The PHE is found to be produced by the orientation of the magnetic moments of the particles, as is also the case for the Faraday effect. The dependence of the PHE with respect to the concentration of the scatterers, the magnetic field, and the polarization of the incident light is measured in liquid and in gelled samples, and is compared to a simple model based on the use of a scattering matrix and the single scattering approximation.

Optical Properties of Fe3O4Magnetic Fluid from Iron Sand

“…This experiment result is in line with the experiment result conducted by Nair et al [14]. Some reports in the literature show the occurrence of magneto-optic effect in the magnetic fluid [22,23]. The most important magneto-optic effect shown by the magnetic fluid is Faraday rotation, Faraday Ellipticity, Kerr Effect, linear dichroism, birefringence, and so forth [24].…”

Experimental investigation on the magneto-optic effects of ferrofluids via dynamic measurements

“…This anisotropy is circular in Faraday's longitudinal configuration (magnetic field direction parallel to light beam) and linear in Voigt configuration (magnetic field direction perpendicular to light beam). The magneto-optical properties of magnetic fluids [4][5][6][7][8][9][10][11][12] are widely studied since a long time, the ferrofluid particles being dispersed either in liquid matrix or in a frozen one [26][27][28][29]. They are interesting from both a static point of view and from a dynamical one [6,12,20,23].…”

“…The magneto-optical properties of magnetic fluids [4][5][6][7][8][9][10][11][12] are widely studied since a long time, the ferrofluid particles being dispersed either in liquid matrix or in a frozen one [26][27][28][29]. They are interesting from both a static point of view and from a dynamical one [6,12,20,23]. For their part, the dynamical properties bring up important technological issues, such as viscometers, nanosizers or optical modulators [4,[30][31][32][33][34][35].…”

Tunable photonic band gap in self-assembled clusters of floating magnetic particles

“…Tunability can be also achieved by liquid crystal infiltration in inverse opal structure, 4 -6 application of elastic stress, 7 or by using magnetic field. [8][9][10][11][12] In the last case the tunability is achieved via Faraday effect in one of the constituents or via field dependence of the magnetic permeability. Most of these ways result in few percent variation of the lattice constant, yet the extreme sensitivity of the photonic bandgap in dielectric mixtures to the symmetry and crystal parameters allows considerable variation in the bandgap.…”