Figure 7 - uploaded by Alberto Tufaile
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Example of light polarization in Polarifluid. The polarized light in a regular piece of plastic in (a), the polarized light obtained with the Polarifluid for a magnetic field of a composed magnet arrangement in (b), and in (c) the simulation of the light polarization pattern for this magnetic field.
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We are presenting the main results of our research using smart fluids to control the light scattering using some devices based on nanotechnology. We are presenting the Ferrolens or Ferrocell®, which consists of a Hele-Shaw cell with ferrofluid, and the "Polarifluid", which is a Ferrolens placed between two crossed polarizers illuminated with white...
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Context 1
... can see some examples of light polarization by light transmission in Fig. 7, with the typical structural colors of polarized light in a regular piece of plastic in Fig. 7(a), the polarized light obtained with the Polarifluid for a magnetic field of a composed magnet arrangement in Fig. 7(b), and in Fig. 7(c) the simulation of the light polarization pattern for this magnetic field. In Fig. 8, we are showing the ...
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... can see some examples of light polarization by light transmission in Fig. 7, with the typical structural colors of polarized light in a regular piece of plastic in Fig. 7(a), the polarized light obtained with the Polarifluid for a magnetic field of a composed magnet arrangement in Fig. 7(b), and in Fig. 7(c) the simulation of the light polarization pattern for this magnetic field. In Fig. 8, we are showing the polarized light pattern obtained for a cubic magnet in polar configuration at different positions ...
Context 3
... can see some examples of light polarization by light transmission in Fig. 7, with the typical structural colors of polarized light in a regular piece of plastic in Fig. 7(a), the polarized light obtained with the Polarifluid for a magnetic field of a composed magnet arrangement in Fig. 7(b), and in Fig. 7(c) the simulation of the light polarization pattern for this magnetic field. In Fig. 8, we are showing the polarized light pattern obtained for a cubic magnet in polar configuration at different positions in the Polarifluid viewing ...
Context 4
... can see some examples of light polarization by light transmission in Fig. 7, with the typical structural colors of polarized light in a regular piece of plastic in Fig. 7(a), the polarized light obtained with the Polarifluid for a magnetic field of a composed magnet arrangement in Fig. 7(b), and in Fig. 7(c) the simulation of the light polarization pattern for this magnetic field. In Fig. 8, we are showing the polarized light pattern obtained for a cubic magnet in polar configuration at different positions in the Polarifluid viewing ...
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Citations
... In each light pattern, the intensity decays exponentially, as in the example of Figure 8c. We have a comparison between the initial luminous pattern of Figure 6a and a simulation of this pattern inside Figure 8c using our previous work [20,30] to model polarized light in a Ferrocell. In Figure 9a, we see the graphs of the exponential decay of luminous intensity of each pattern shown in Figures 8a and 9a, the variation of the horizontal magnetic field of each monopolar configuration used. ...
... The birefringence effect occurs due to the phase shift between the two circularly polarized components of light passing through a medium with chiral properties, such as ferrofluids under an applied magnetic field. Thus, the effects of circular polarization are more linked to the component of the magnetic field applied perpendicularly to the film, as shown by the refractive index ellipsoid in Figure 10a of our previous work [3,22,30]. ...
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.
... For the last fourteen years numerous researches have studied and published research about the ferrolens and magnetic fields as well magneto-optics driven light polarization related research using the ferrolens [1][2][3][4][5][6][7][8] [10][11][12]. We herein concentrate exclusively on the research of magnetic fields using the ferrolens as a real time magnetic field viewer physical device. ...
... A ferrolens 1,2 [1][2][3][4][5][6] [7][8][9][10][11][12] consists of two optical quality glass disks separated by a thin-film of superparamagnetic fluid. This fluid is comprised of nano-sized magnetite Fe 3 O 4 particles less than 10nm in size average, coated with a polar surfactant oleic acid and suspended in a light hydrocarbon-based colloidal solution, commonly known as Ferrofluid (EFH1 3 product was used) which is however further heavily diluted and refined using a centrifuge machine in the case of the ferrolens's thinfilm which is about 10μm thick (latest generation) and by using additional hydrocarbon based solvent (e.g. ...
... For the last fourteen years numerous researches have studied and published research about the ferrolens and magnetic fields as well magneto-optics driven light polarization related research using the ferrolens [1][2][3][4][5][6][7][8] [10][11][12]. We herein concentrate exclusively on the research of magnetic fields using the ferrolens as a real time magnetic field viewer physical device. ...
... A ferrolens 1,2 [1][2][3][4][5][6] [7][8][9][10][11][12] consists of two optical quality glass disks separated by a thin-film of superparamagnetic fluid. This fluid is comprised of nano-sized magnetite Fe 3 O 4 particles less than 10nm in size average, coated with a polar surfactant oleic acid and suspended in a light hydrocarbon-based colloidal solution, commonly known as Ferrofluid (EFH1 3 product was used) which is however further heavily diluted and refined using a centrifuge machine in the case of the ferrolens's thinfilm which is about 10μm thick (latest generation) and by using additional hydrocarbon based solvent (e.g. ...
Summary: Real time display with the ferrolens of homogeneous magnetic fields like that of Helmholtz coils.
_________________________________________________________________________________________Highlights:
• For Helmholtz coils at 20mT field strength and above.
• Comparison of non-homogeneous and homogeneous magnetic fields display with the ferrolens.
• Discrete magnetic lines of force display of the field.
• Magneto optic alignment tool for particle accelerators beam magnetic focus--------------------------------------------------------------------------------------------------------------------------Abstract------------------------------------------------------------------------In our previous published research we have studied the applications of the ferrolens for the observation and qualitative analysis of non-homogeneous magnetic fields. Latest developments over the last few years of the ferrolens increased multifold the sensitivity of this device allowing it to display magnetic fields as low as 10mT in strength and therefore it is possible now to observe also the homogeneous (i.e. straight parallel magnetic flux lines of uniform density in space) magnetic field existing inside air solenoids and between N-S poles of two attracting separated permanent magnets. We present and analyze herein these novel observations of homogeneous magnetic fields with the ferrolens and as a potential new application of this device. The ferrolens can now display the projected magnetic field on air from a distance without needing to be in physical contact with the field source. Experiments were carried out to demonstrate these new capabilities of the ferrolens as a nanomagnetic flux viewer, real-time physical device and scientific qualitative tool. We compare the geometry of magnetic fields of condensed matter ferromagnets with that of magnetic fields inside electrical air solenoids. Specifically, the homogeneous field between two N-S attracting magnets at a distance as well as inside air solenoids and Helmholtz coils and also the non-homogeneous total field of single dipole permanent magnets were observed using a latest generation very sensitive ferrolens. The unique feature of this magneto optic fluid thin film physical device is that it can display discrete magnetic flux lines of the macroscopic field. Also we show how the ferrolens can be used to detect qualitatively the symmetry center of a non ideal homogeneous magnetic field. © 2021 Elsevier B.V. All rights reserved.
... We have used different types of setups to explore the properties of the light patterns in ferrofluids and compare them with atmospheric patterns. We can observe patterns in the plane of Figure 1d directly in the thin film of ferrofluid [1,[9][10][11], in which the source of lights consists of LEDs. The second case is laser transmission through the ferrofluid [1,10] subjected to a magnetic field in Figure 1b. ...
... The second case is laser transmission through the ferrofluid [1,10] subjected to a magnetic field in Figure 1b. The third case is the light polarization presented in Figure 2b [10,11]. We were inspired to compare the light patterns of gems and ferrofluids by a demonstration at the Geo Gallery, Smithsonian Natural Museum of Natural History in Washington, D.C., USA [12], which consisted of grids of lines with one white LED as the source of light. ...
We have explored some features of the complex fluids present in Earth’s atmosphere by the observation of some optical phenomena and compared them to the optical phenomena observed in gems and magnetic materials. The main feature of a complex fluid is that it contains polyatomic structures such as polymer molecules or colloidal grains. This paper includes some setups using tabletop experiments, which are intended to show concretely the principles discussed, giving a sense of how well the idealizations treated apply to the atmospheric systems. We have explored sundogs, light pillars, and the halo formation, which involve the existence of a certain structure in the atmospheric medium, resembling the structures observed in some types of gems and ferrofluids.
We are presenting experimental results and simulations of dynamical systems using magneto-optics. These light patterns are obtained by the observation of a thin film of ferrofluid in the presence of a magnetic in the presence of a magnetic field.
