Magneto optical devices for optical integrated circuits, frontiers in guided wave optics and optoelectronics, bishnu pal, intechopen, doi. These two phenomena are conceptually very similar but differ mainly from their point of reference. When a strong uniform magnetic field is applied on a magnetic fluid, the magnetic nanoparticles will. A notable advantage of phase change recording over magnetooptical recording is that erasing previously written marks can be done on the fly, without additional means. An introduction to acoustooptics scott e pollack physics 7810 fundamentals of optics and lasers university of colorado, boulder december, 2002 abstract this paper is a brief introduction to acoustooptic phenomena. The most significant of these properties are that the linear magnetooptic effect can produce circular birefringence and that, unlike other optical effects in dielectric media, it is nonreciprocal. Magnetooptic devices using interaction between magnetostatic surface wave and optical guided wave. The history of magneto optical effects is first introduced. Nasa technical note electrooptic and magnetooptic modulators by e. The photomagnetic and magnetooptic effects springerlink. Current optical isolators and circulators comprise of bulk optics and employ the magnetooptical faraday effect, in which a polarization plane. Electromagnetic optics optics is a branch of electromagnetism electromagnetic optics include both wave optics scalar approximation ray optics limit when. The most significant of these properties are that the linear magneto optic effect can produce circular birefringence and that, unlike other optical effects in dielectric media, it is nonreciprocal. Magnetooptical devices for optical integrated circuits intechopen.
Magnetooptical article about magnetooptical by the free. The physical origin of the magnetooptical effects is phenomenologically discussed. As the acoustic wave travels through the medium, it causes periodic variations in the index. T he sensor head consist of only optical component. Magneto optic current transformer technology moct doi. Magnetooptical device for identification and detection of. The device is intended for nondestructive examination of metal surface for authenticity verification and detection of vin falsification, for restoration of original vin and verification of vehicle related documents. Acoustooptics is a branch of physics that studies the interactions between sound waves and light waves, especially the diffraction of laser light by ultrasound or sound in general through an ultrasonic grating. A magneto optical drive is a kind of optical disc drive capable of writing and rewriting data upon a magneto optical disc. The disk is coated with film that initially is uniformly magnetized. Magnetooptical device for identification and detection of vehicle units numbers falsification regula 7505m. We have recently developed a magneto optical mo method which allows highsensitivity detection of malaria pigment hemozoin crystals in blood via the magnetically induced rotational motion of the hemozoin crystals. Investigation of magnetooptical properties for optical.
All practical magneto optic devices exploit one or bothof. Implications for spin devices, abstract we present results on the magnetooptic properties of ferromagnetic films deposited on gaas and sio2 substrates. Acoustooptical effects principles and applications. The magnetooptical mo drive is a popular way to back up files on a personal computer. Pdf we have demonstrated that magnetooptical materials are important for optoelectronics, because of their unique nonreciprocal and memory.
The signal is brought down by fiber optical cables to the signal processing unit therefore the. Magneto optical device for identification and detection of vehicle units numbers falsification regula 7505m the device is intended for nondestructive examination of metal surface for authenticity verification and detection of vin falsification, for restoration of original vin and verification of vehicle related documents. A magnetooptic effect is any one of a number of phenomena in which an electromagnetic wave propagates through a medium that has been altered by the presence of a quasistatic magnetic field. Conclusions the discovery of magneto optic effect in 1945 by michael faraday marked the first observation of an interaction between light and magnetism, as well as the beginning of the field of magneto optics. Then the types of magnetooptical effects are described, which include the varieties of the interactions of electromagnetic waves with magnetization or spins in solids. A magnetooptic effect is any one of a number of phenomena in which an electromagnetic. Measurement of magnetooptic kerr effect using piezobirefringent modulator j. Magnetooptical device for identification and detection of vehicle units numbers falsification regula 7505m the device is intended for nondestructive examination of metal surface for authenticity verification and detection of vin falsification, for restoration of original vin and verification of vehicle related documents. An mo disk drive is designed so that an inserted disk will be exposed to a magnet on the label side and to the laser beam on the opposite side. This chapter will discuss the theory and applications of the photomagnetic and magnet optic effects. We have recently developed a magnetooptical mo method which allows highsensitivity detection of malaria pigment hemozoin crystals in blood via the magnetically induced rotational motion of the hemozoin crystals. Hereby, the technique benefits from its high sensitivity and its compatibility with almost any. The discovery of magnetooptical effects evoked a new thought that the nature of light was an electromagnetic entity, and played a central role. Therefore, properties of magnetooptical materials are different for two opposite directions of light propagation and optical nonreciprocal devices like the optical.
Magneto optic definition is of, relating to, or utilizing the influence of a magnetic field upon light. Magnetooptics a branch of physics that studies changes in the optical properties of media upon exposure to a magnetic field and the peculiarities of the interaction of optical radiation light with matter placed in the field that are responsible for the changes. The research activities on the phenomenon of magnetooptic effects has recently promulgated due to its versatile use in magnetooptic recordings for high density magnetic data storage, magnetic field sensors and its applications in magnetoelectronics. The branch of physics that deals with phenomena associated with magnetic effects on matter as it emits light, having applications in computer. As the term implies, an mo device employs both magnetic and optical technologies to obtain ultrahigh data density. A typical mo cartridge is slightly larger than a conventional 3. The optic and magnetooptic effects of the magnetic liquids can be theoretically studied using a selfconsistent effective medium formalism, providing the nanoparticles are much smaller than the light wavelength.
A magnetooptical drive is a kind of optical disc drive capable of writing and rewriting data upon a magnetooptical disc. Magnetooptic effect definition of magnetooptic effect. Single crystal garnets and sputtered films remain the basic material for nonreciprocal isolators, modulators and field sensors. The last two are only used in spintronics devices, while mo effects are also suitable to laboratorial studies on dmss. Optical nonreciprocal devices based on magnetooptical phase. Phase change recording canons cfview and cf index pc software coupled with canons diskfile drive 5001s, a magneto optical disk drive, make a desktop pc into a canofile. The chapters discuss negative refraction, negative refractive index and subwavelength imaging, magneto optics and the kerr effect with ferromagnetic materials, symmetry properties of nonlinear magneto optical effects, optical magnetism in plasmonic metamaterials, chiral photonic media, optical vortices, photonic crystals, wave interference and modes in random media, chaotic behaviors of random. Acoustooptics is a phenomenon which deals with the interaction of light optics and sound acoustics. A notable advantage of phase change recording over magneto optical recording is that erasing previously written marks can be done on the fly, without additional means. An electrooptic effect is a change in the optical properties of a material in response to an electric field that varies slowly compared with the frequency of light. Magnetooptical phase modulation in integrated mach.
Complete magnetooptical waveguide mode conversion in cd1ax. Magnetooptical devices the optics encyclopedia castera. The term encompasses a number of distinct phenomena, which can be subdivided into a change of the absorption. Evaluation of a novel magnetooptical method for the.
A laser beam is used to demagnetize a small spot on the film by heating it above. Optic imaging moi eddy current system provides a proven, fast, and reliable method to inspect flush mount fasteners that is specified by commercial and military aircraft manufacturers, as well as repair and maintenance centers. Improving the efficiency of malaria diagnosis is one of the main goals of current malaria research. Based on the sensitivity of mfbg spectral lines to the magnetooptic mo coupling. The optic axis of this induced optical activity is aligned with the axis of the applied magnetic field. Magnetooptical article about magnetooptical by the. Magneto optical kerr effect longitudinal, polar, timeresolved transient moke background the magneto optical kerr effect moke and the faraday effect describe the change in polarization of incident light as it is reflected or transmitted by a magnetic material. The history of magnetooptical effects is first introduced. In this formalism, the optical properties of the composite medium are described by an effective dielectric tensor that depends on. Nasa technical note electro optic and magneto optic modulators by e. In a planar waveguide including magnetooptical mo material with inplane magnetization, a mo phase shift due to a firstorder mo effect is induced. Typical combinations of power p and velocity v in various metal am processes.
The emphasis of this thesis is the investigation of faraday rotation for small beam sizes that are compatible with standard. The existence of an interaction between light and sound was discovered by brillouin in the. Then the types of magneto optical effects are described, which include the varieties of the interactions of electromagnetic waves with magnetization or spins in solids. Magnetooptics article about magnetooptics by the free. An accurate electric current transducer is a key component of any power system instrumentation. The magnetooptic principle is based on the faraday effect. Usb flash drive a small, portable flash memory card that plugs into a computers usb port and functions as a portable hard drive.
Pdf magnetooptical devices for optical integrated circuits. Chapter 31 principles of optical disk data storage masud mansuripur optical sciences center uni y ersity of arizona tucson, arizona 3 1. The technological wonders of these rugged devices routinely escape users notice, because the internal functioning of disk drives is hidden from view. Osa waveguide magnetooptical devices for photonics. The source of this optical anisotropy is the magnetisation m within surface domains which can be influenced by external forces such as magnetic fields. To measure currents power stations and substations conventionally employ inductive type current transformers with core and windings. An electro optic effect is a change in the optical properties of a material in response to an electric field that varies slowly compared with the frequency of light. Then the types of magnetooptical effects are described. Pdf infiber magnetooptic devices based on ultrahigh. Request pdf magnetooptical devices the history of magnetooptical effects is first introduced. By use of magnetooptical systems it is possible to perform these checkups in realtime. The source of this optical anisotropy is the magnetisation m within surface domains which can be influenced. May, 2014 improving the efficiency of malaria diagnosis is one of the main goals of current malaria research.
This chapter will discuss the theory and applications of the photomagnetic and magnetoptic effects. Pdf on feb 2, 2009, nasser peyghambarian and others published infiber magnetooptic devices based on ultrahigh verdet constant organic materials and holey fibers find, read and cite all the. A magnetic field, like any vector field, singles out a specific direction in space. Flash drives are available in sizes such as 256mb, 512mb, 1gb, 5gb, and 16gb and are an easy way to transfer and store information. In general, magneto optic effects break time reversal symmetry locally i. Furthermore, the low rotation attenuation is crucial in a number of magneto. Magnetooptical devices for optical integrated circuits. This technique, proposed by faraday, provides asimple way to. A machzehnder interferometer mzibased optical isolator and circulator are fabricated by the direct bonding technique between silicon and mo garnets. The physical origin of the magneto optical effects is phenomenologically discussed.
Electrooptic and magnetooptic photonic devices based on. Magnetooptic definition of magnetooptic by merriamwebster. Magnetooptic definition is of, relating to, or utilizing the influence of a magnetic field upon light. Magnetooptic effect synonyms, magnetooptic effect pronunciation, magnetooptic effect translation, english dictionary definition of magnetooptic effect. Magnetooptic materials have unique physical properties that offer the opportunity of constructing devices with many special functions not possible from other photonic devices.
Magnetooptical and optical properties of nanostructured systems. Magnetooptical effect and applications mint center. Hirschmann godddrd space greenbelt, md flight center national aeronautics and space administration washington, d. A type of disk drive that combines magnetic disk technologies with optical technologies, such as those used in cdroms. Several methods for integrating magnetooptical waveguide devices with. Magnetooptic devices using interaction between magnetostatic. All practical magnetooptic devices exploit one or bothof. Magneto optic current transducer consist of a sensor head located near the current carrying conductor, an electronic signal processing unit and fiber optical cables linking to these two parts. In this physics video tutorial series i attempt to make the link and go from classical electromagnetism to optics. Nov 28, 2012 by use of magneto optical systems it is possible to perform these checkups in realtime. While other checking devices can not magnetooptical systems are capable of checking not just for the presence of magnetic information, but also to investigate the magnetizations quality, which might be an indicator of frauded banknotes. In 1983, just a year after the introduction of the compact disc, kees schouhamer immink and joseph braat presented the first experiments with erasable magnetooptical compact discs during the 73rd aes convention.
It describes the rotation of the polarization plane of linearly polarized light when passing through a transparent medium. While other checking devices can not magneto optical systems are capable of checking not just for the presence of magnetic information, but also to investigate the magnetizations quality, which might be an indicator of frauded banknotes. Magneto optical effects in magnetic materials arise due to the optical anisotropy of the materials. Magnetooptics is a crucial characterization and detection technique for materials and devices. Characteristics of magnetooptic fiber bragg gratings for use in. Optical nonreciprocal devices based on magnetooptical. Device drivers windows replaced mscdex with the protectedmode cd file system cdfs driver part of the windows installable file system ifs family of cooperative drivers for storage devices windows also contains builtin drivers for all cdroms. Nov 02, 2015 magneto optics is a crucial characterization and detection technique for materials and devices. Electromagnetism to optics university physics tutorials. With a closer look, linearly polarized light consists of superposition of a left and a rightcircularly polarized wave with same frequency and phase. Finally, we describe a microcavity with a defect mode that is tuned in the near infrared by the magnetic field, envisaging a contactless magnetooptic switch. In such a medium, which is also called gyrotropic or gyromagnetic, left and rightrotating elliptical polarizations can propagate at different speeds, leading to a number of important phenomena. Computer users tend to take for granted the existence of magnetic and optical memory devices that offer breathtaking datastorage capacity with extremely high reliability at very low cost. We present to the reader the mathematical formalism used to describe this phenomena as well as the common.