Extinction of light by a Ferrocell and ferrofluid layers: A comparison

Dave, Vishakha; Mehta, R. V.; Bhatnagar, S. P.

doi:10.1016/j.ijleo.2020.164861

Cited by 4 publications

(5 citation statements)

References 27 publications

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“…Now, we will apply these ideas of Geometrical Theory of Diffraction in the Ferrocell. Light scattering in ferrofluids has been debated over the last two decades, which shows the complexity of an interesting topic [22,23]. For example, light scattering by self-assembled arrays of ferrofluid micro-needles was compared to light scattering in cylinders [24].…”

Section: Light Scattering In Ferrofluidsmentioning

confidence: 99%

“…We observed that the diameters of ferrofluid micro-needles reaching up to 4.3 μm. According to some authors in the field of ferrofluids [23], light scattering is essentially of an electric dipole nature, while scatterers (micro-needles) are organized by a magnetostatic phenomenon. The columns or micro-needles have a characteristic size that can be measured using light diffraction, when we place a uniform magnetic field with the same direction as the light, by forming these Airy diffraction patterns, as shown in Figure 7.…”

Section: Light Scattering In Ferrofluidsmentioning

confidence: 99%

“…We observed that the diameters of ferrofluid micro-needles reaching up to 4.3 µm. According to some authors in the field of ferrofluids [23], light scattering is essentially of an electric dipole nature, while scatterers (micro-needles) are organized by a magnetostatic phenomenon. How can this information help us?…”

Section: Light Scattering In Ferrofluidsmentioning

confidence: 99%

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Horocycles of Light in a Ferrocell

2021

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We studied the effects of image formation in a device known as Ferrocell, which consists of a thin film of a ferrofluid solution between two glass plates subjected to an external magnetic field in the presence of a light source. Following suggestions found in the literature, we compared the Ferrocell light scattering for some magnetic field configurations with the conical scattering of light by thin structures found in foams known as Plateau borders, and we discuss this type of scattering with the concept of diffracted rays from the Geometrical Theory of Diffraction. For certain magnetic field configurations, a Ferrocell with a point light source creates images of circles, parabolas, and hyperboles. We interpret the Ferrocell images as analogous to a Möbius transformation by inversion of the magnetic field. The formation of circles through this transformation is known as horocycles, which can be observed directly in the Ferrocell plane.

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Section: Light Scattering In Ferrofluidsmentioning

confidence: 99%

Section: Light Scattering In Ferrofluidsmentioning

confidence: 99%

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Horocycles of Light in a Ferrocell

2021

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“…In this way, the thin film of ferrofluid possesses the ability to rotate the plane of polarization of light passing through them. For more information about optical properties of light scattering in structured fluids, ferrofluids and Ferrocell (Ferrolens), we recommend some references [20][21][22].…”

Section: Polarizationmentioning

confidence: 99%

Jumping Sundogs, Cat’s Eye and Ferrofluids

et al. 2020

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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.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

Real time display with the ferrolens of homogeneous magnetic fields

Markoulakis

Vanderelli

Frantzeskakis

2022

Journal of Magnetism and Magnetic Materials

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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.

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Extinction of light by a Ferrocell and ferrofluid layers: A comparison

Cited by 4 publications

References 27 publications

Horocycles of Light in a Ferrocell

Horocycles of Light in a Ferrocell

Jumping Sundogs, Cat’s Eye and Ferrofluids

Real time display with the ferrolens of homogeneous magnetic fields

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