This research required knowledge of circuit theory, a fundamental understanding of optical devices, components, and networks, and an understanding of magnetism and magnetic materials. Chapter iv other devices electro optic effect electro optic. Magnetooptic definition of magnetooptic by merriamwebster. Analyzing electrical test data obtained from these prototypes and providing feedback and design learning to the team.
Investigation of magneto optical properties for optical fiber based devices by rashmi bahuguna a dissertation submitted to the graduate faculty in partial fulfillment of the requirements for the degree of doctor of philosophy major. Magnetooptical devices for optical integrated circuits intechopen. Enhanced magnetic modulation of light polarization. The corresponding faraday rotation could be measured in the external magnetic field with different magnetic intensity by this magneto optic system. The faraday effect is a rotation of the lightpolarization induced by a magnetic field. Finally, we will describe some applicative uses of magnetooptic effects in measurement devices, in wave modulators, and in memory devices. Magnetooptical devices for optical integrated circuits. In particular, the transfer rate performance of two erase strategies are explored as a function of parameters accessible to the image application developer. Waveguide optical isolators use magneto optic mo material, such as iron, cobalt, or yttrium iron garnet yig, to generate a nonreciprocal effect with the existence of an external magnetic field. In 1983, just a year after the introduction of the compact disc, kees schouhamer immink and joseph braat presented the first experiments with erasable magneto. The magnetooptic effect has a wide range of applications for the fabrication of microstructure devices, such as modulator, circulator, isolator, sensor and magnetooptical recording etc. Magnetooptical disc a magnetooptical disc is an information carrier that combines the characteristics of optical and magnetic data storage.
Such magnetophotonic devices offer high bandwidth modulation and switching capabilities comparable to those based on. Pdf faraday effect and other magnetooptic effects in. The second important property of the magnetooptical materials is a memory function. Magnetooptic definition is of, relating to, or utilizing the influence of a magnetic field upon light. 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. These devices utilize the faraday effect, in which the magnetic field associated with an electrical signal modulates an optical beam. Isotropic contributions to the dielectric functioni.
A magnetooptic effect is any one of a number of phenomena in which an electromagnetic. The second important property of the magneto optical materials is a memory function. The magnetooptical mo drive is a popular way to back up files on a personal computer. Proceedings volume 0038, electrooptics principles and applications. Magnetooptical imaging has developed rapidly over the last decade to emerge as a leading technique to directly visualise the static and dynamic magnetic behaviour of materials, capable of following magnetic processes on the scale of centimeters to submicrons and at timescales from hours to. Mar 14, 2016 existing approaches using the magneto optic kerr effect, xray and electron microscopy have limitations that constrain further development and there is increasing demand for imaging and. The magnetooptical effect can be enhanced by means of optical resonances. Pdf the interaction of light with matter involves the electronic structure of the matter. Magnetooptical imaging of thin magnetic films using spins in. Highresolution magneto optic measurements with a sagnac interferometer invited a. Broadband te optical isolators and circulators in silicon. Mar 17, 2014 among these materials, zinc oxide zno, which is an ntype iivi semiconductor with wide band gap energy e g 3. Index terms allfiber switch, faraday effect, magnetooptic switching.
Therefore, properties of magnetooptical materials are different for two opposite directions of light propagation and optical nonreciprocal devices like the optical isolator and the optical circulator can be fabricated only by utilizing magnetooptical materials. Magneto optic characterization magneto optic characteristics of materials are determined based on the interaction of light and matter in the presence of a magnetic field. The origin of this effect can be understood on the basis of magnetic field. 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. Therefore, properties of magnetooptical materials are different for two opposite directions of light propagation and optical nonreciprocal devices like the optical. Fejer department of applied physics, stanford university, stanford, california 94305 a technique for measuring the faraday effect and the magneto optic kerr effect has been developed.
The disk is coated with film that initially is uniformly magnetized. Castechs trf drive power can be used with acoustooptic devices. The present invention is in the field of a magneto optical device comprising a magnetic. Mar 30, 2020 enhancing magneto optical effects is crucial for reducing the size of key photonic devices based on the nonreciprocal propagation of light and to enable active nanophotonics. The mo properties arise from different effects of these interactions. An accurate electric current transducer is a key component of any power system instrumentation. The other, less useful, way to break time reversal. Single crystal garnets and sputtered films remain the basic material for nonreciprocal isolators, modulators and field sensors. Silicon ring isolators with bonded nonreciprocal magneto. Apr 23, 2020 welcome to the muri center for dynamic magneto optics dynamo at the university of michigan, which supports investigations of intense magneto optic phenomena with relevance to electromagnetic energy conversion, terahertz generation, and high frequency optical magnetism. Chapter iv other devices electro optic effect electro optic effect can be observed when light propagates through a crystal in the presence of an electric field. Many applications in data centers, telecommunications and sensors would benefit from. Investigation of magnetooptical properties for optical fiber. A surfaceactivated direct bonding technique plays a key role in the fabrication of magnetooptical nonreciprocal devices.
The magnetooptical chips principle is based on the faraday e. Then, some representatives of magnetooptical materials of transmission faraday effect and reflection kerr types are described. A typical mo cartridge is slightly larger than a conventional 3. This enhances the magnetooptical phase shift and, hence, contributes greatly to reducing the device footprint. Highresolution magnetooptic measurements with a sagnac. Mccord perature, mechanical stress or, most importantly, arbitrary magnetic fields may be applied, al lowing to study magnetization processes easily. Finally, we will describe some applicative uses of magneto optic effects in measurement devices, in wave modulators, and in memory devices. The device was implemented experimentally with promising results. Electrooptics files, tape drives, and optical storage devices r w devices based on the magnetooptic effect. Proceedings volume 1274, electrooptic and magneto optic materials ii. The basic principles of magnetooptic effects, as well as the functions of various magnetooptic devices based on these effects, are considered in this chapter.
In general, magnetooptic effects break time reversal symmetry locally i. Magneto optic definition is of, relating to, or utilizing the influence of a magnetic field upon light. This work was supported in part by the air force sbir under contract fa865016c1758 with morton photonics, in part by the center for. Pdf we have demonstrated that magnetooptical materials are important for optoelectronics, because of their unique nonreciprocal and memory. Magneto optic current transformer technology moct attish jain btech, eee, srm university kancheepuram kattankulathur 603203 abstract.
The optical isolation can be achieved by nonreciprocal mode conversion 1. Introduction the circulator is a multipleport device that routs light such that light entering any port exits from the next, much like a roundabout for photons. Early mass storage devices stone tablets hieroglyphics gutenberg bible index cards photographs wire recording selectron tube punch cards punch tape magnetic drum memory hard disk laser disc floppy disc magnetic tape the selectron tube had a capacity of 256 to 4096 bits 32 to 512 bytes. A magnetooptical drive is a kind of optical disc drive capable of writing and rewriting data upon a magnetooptical disc. All practical magneto optic devices exploit one or bothof these two properties. Cadmium manganese telluride cdmnte cadmium manganese mercury telluride cdmnhgte and tdgdg. Finally the concept of magneto optic kerr effect is discussed and a setup utilizing the effect for magnetic probing is presented. Magnetooptic response of the metallic antiferromagnet fe.
The, files are studied as a function of various system parameters and file sizes for a magnetooptic mo drivemicrocomputer system. The discovery of magneto optical effects evoked a new thought that the nature of light was an. A magnetooptical fiber device based on magnetic fluidfilled. The source of this optical anisotropy is the magnetisation m within surface domains which can be influenced by external forces such as magnetic fields. The device was invented in the beginning of the 80s.
A magnetooptical disc and the numerous rectangles on its surface. Aug 10, 2015 a magneto optic system based on the stokes polarization parameters method is designed which could analyze the faraday effect. The drive power supply has a variety of operating modes, such as fps, ppk, r05 and a05. Optical nonreciprocal devices based on magnetooptical phase. It is desired to adapt the surface magneto optic kerr effect setup to an existing vacuum system already containing a vaporizer, mass spectrometers, leed, and a stm. Analysis of superresolution in magnetooptic data storage devices. Enhancing magneto optical effects is crucial for reducing the size of key photonic devices based on the nonreciprocal propagation of light and to enable active nanophotonics.
A mathematical framework is derived for transferfunction analysis of magneto optic data storage devices. The basic principles of magneto optic effects, as well as the functions of various magneto optic devices based on these effects, are considered in this chapter. Tuning of structural, optical, and magnetic properties of. Magnetooptic characterization magnetooptic characteristics of materials are determined based on the interaction of light and matter in the presence of a magnetic field. New experimental approaches to magnetism constanta, 2005 magnetooptical microscopy incl. Several ways to improve the transfer function are analyzed, and several optical systems are compared in respect to relative contrast level versus frequency.
Manage the execution of new headmedia designs into drive. This includes widely used rigid disk drives, floppy disk files, tape drives, and optical storage devices r w devices based on the magnetooptic effect. To measure currents power stations and substations conventionally employ inductive type current transformers. Recent advances of wide band magnetooptical modulators. Application and development of optical and or electrical test strategies and methods. What links here related changes upload file special pages permanent link page. The electric field applied to the crystal can alter or induce birefringence by changing the refractive index of the medium. The research activities on the phenomenon of magneto optic effects has recently promulgated due to its versatile use in magneto optic recordings for high density magnetic data storage, magnetic field sensors and its applications in magneto electronics.
Magneto optical effects in magnetic materials arise due to the optical anisotropy of the materials. Faraday rotation in femtosecond laser micromachined waveguides. The discovery of magnetooptical effects evoked a new thought that the nature of light was an electromagnetic entity, and played a central role. 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. Enhanced magnetic modulation of light polarization exploiting. Pdf magnetooptical devices for optical integrated circuits. Chapter iv other devices electro optic effect electro. 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. In general, magneto optic effects break time reversal symmetry locally i. As the term implies, an mo device employs both magnetic and optical technologies to obtain ultrahigh data density. Apr 10, 2011 magneto optical disc a magneto optical disc is an information carrier that combines the characteristics of optical and magnetic data storage. The characteristics of the magneto optic medium define what portions of the optical system transfer function are important. A laser beam is used to demagnetize a small spot on the film by heating it above. Magnetooptic principles, materials and applications.
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