Linear Birefringence and Linear Dichroism Coupled Optical Anisotropy of Magnetic Fluids by External Magnetic Fields

Pu, Shengli; Dai, Min; Sun, Guoqing; Liu, Ming

doi:10.1109/sopo.2009.5230096

Cited by 10 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Now we are going to explore some properties of circularly polarized light in a thin film of ferrofluid. According to literature related to light polarization in magnetic fluids, if linearly polarized light passes through ferrofluids under external magnetic fields, the transmitted light can become elliptically polarized depending on the relative orientation between the polarization of the incident light and the applied magnetic field [32].…”

Section: Circular Polarization Characteristics Of Light In a Ferrocellmentioning

confidence: 99%

Study of Light Polarization by Ferrofluid Film Using Jones Calculus

2022

View full text Add to dashboard Cite

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.

show abstract

Section: Circular Polarization Characteristics Of Light In a Ferrocellmentioning

confidence: 99%

Study of Light Polarization by Ferrofluid Film Using Jones Calculus

2022

View full text Add to dashboard Cite

show abstract

“…The strength of magnetic field can be adjusted by tuning the magnitude of the supply current. For the birefringence measurement, the optimum angle of the polarization direction of the incident linearly polarized light with respect to the magnetic field should be around π/4 [ 30 ]. At a given magnetic field, the light transmittance after the analyzer is investigated.…”

Section: Methodsmentioning

confidence: 99%

Enhanced magnetic-field-induced optical properties of nanostructured magnetic fluids by doping nematic liquid crystals

Wang

et al. 2012

Nanoscale Res Lett

Self Cite

View full text Add to dashboard Cite

Ferronematic materials composed of 4-cyano-4′-pentylbiphenyl nematic liquid crystal and oil-based Fe3O4 magnetic fluid were prepared using ultrasonic agitation. The birefringence (Δn) and figure of merit of optical properties (Q = Δn/α, where α is the extinction coefficient) of pure magnetic fluids and the as-prepared ferronematic materials were examined and compared. The figure of merit of optical properties weighs the birefringence and extinction of the materials and is more appropriate to evaluate their optical properties. Similar magnetic-field- and magnetic-particle-concentration-dependent properties of birefringence and figure of merit of optical properties were obtained for the pure magnetic fluids and the ferronematic materials. For the ferronematic materials, the values of Q increase with the volume fractions of nematic liquid crystal under certain fixed field strength and are larger than those of their corresponding pure magnetic fluids at high field region. In addition, the enhancement of Q value increases monotonously with the magnetic field and becomes remarkable when the applied magnetic field is beyond 50 mT. The maximum relative enhanced value of QR exceeds 6.8% in our experiments. The results of this work may conduce to extend the pragmatic applications of nanostructured magnetic fluids in optical field.

show abstract

“…Ferro fluids have unique identity because of their remarkable magnetic, optical and electrical properties [5]. The magneto optical properties of ferrofluid has a major role for the development of optoelectronic devices such as optical modulator, optical switches, tunable grating, wavelengthdivision multiplexer,holographic optical tweezers, sensors etc [6,7]. In the absence of an external magnetic field, ferrofluid is optically isotropic; nevertheless, once the external field is added, they display anisotropic behaviour and indicate Linear dichroism, Faraday rotation, birefringence, magneto-optical transmission, and other magneto-optic phenomena.…”

mentioning

confidence: 99%

Magneto-optical studies of kerosene based ferrofluid

Nimisha

Kannan

Mary

2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Magnetic fluids are technologically important due to their tunable magnetic, electrical and optical properties. The magneto optical properties of ferrofluid have a major role for the development of optoelectronic devices. This paper represents the detailed analysis of kerosene based ferrofluid, their structure and magneto optical properties will be investigated. Iron oxide nanofluids are synthesised by a Co-precipitation method. The X-ray diffraction technique is used for structural characterization. The magneto optical property of the iron oxide nanofluid have been investigated by linear dichroism measurements. Individual magnetic particle’s intrinsic optical anisotropy or shape anisotropy create linear dichroism. The magnetic susceptibility of ferrofluid with different volume fractions is measured using Quincke’s method.

show abstract

Linear Birefringence and Linear Dichroism Coupled Optical Anisotropy of Magnetic Fluids by External Magnetic Fields

Cited by 10 publications

References 19 publications

Study of Light Polarization by Ferrofluid Film Using Jones Calculus

Study of Light Polarization by Ferrofluid Film Using Jones Calculus

Enhanced magnetic-field-induced optical properties of nanostructured magnetic fluids by doping nematic liquid crystals

Magneto-optical studies of kerosene based ferrofluid

Contact Info

Product

Resources

About