Abstract
We studied the polarized light patterns obtained using a thin film of ferrofluid subjected to an applied magnetic field. We obtained patterns of polarized light with magnetic field configurations between parallel plates, monopolar, tetrapolar, and hexapolar, and studied how polarized light varies for different intensities and orientations of the applied magnetic field. Using the Jones calculus, we explored the key optical properties of this system and how these properties relate to the applied magnetic field. We have observed general aspects of polarized light obtained by transmission in a Ferrocell using polariscopes and analyzing the resulting Jones vector, such as the formation and rotation of dark bands known as isogyres. We suggest that in a thin film of ferrofluid as in a Ferrocell, two effects occur. The primary effect is dichroism, which is more sensitive to the component of the magnetic field in the direction parallel to the film plane. The secondary effect is the birefringence that can be observed by analyzing the circular polarization of light. Birefringence is related to the thin film thickness of ferrofluid.
Highlights
IntroductionThere are certain things that lead us to think about nature. Humanity is in contact with luminous patterns in nature that have aroused our curiosity since antiquity
The present work is based on our previous works that studied the polarization of light in ferrofluid thin films with the Ferrocell [20], and we present an interpretation of the results we obtained using polariscopes with a formal representation of the Jones calculus, Stokes parameters, and Poincaré sphere
Using the polarized light imaging technique, we explored the connections between microscopic film properties and macroscopic properties of light patterns observed from a thin film of ferrofluid subjected to an applied magnetic field
Summary
There are certain things that lead us to think about nature. Humanity is in contact with luminous patterns in nature that have aroused our curiosity since antiquity. As far as we know, this work presents for the very first time a connection between polariscopic experiments and Ferrocell, with the observation of patterns involving structures known as isogyres and their relationship with the orientation of magnetic field lines, which in turn has a direct consequence in the study of ferrofluid magneto-optics. These results can be used to study the light patterns with the different effects that can occur in the scattering of light by nanoparticles under the effect of magnetic fields
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