Magnetooptical kerr effect moke univerzita karlova. The modulation may be imposed on the phase, frequency, amplitude, or polarization of the beam. Pixelated crystal of aluminum garnet switched by array of magnetic coils using magnetooptic effect. Pdf magnetooptical modulator for superconducting digital output. Magnetooptic modulators have also been used in the farinfrared. Optical modulators using semiconductor nanostructures. Pockels cell is such device which can produce controllable birefringence by applying voltage to the cell. 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. Our mo modulator is based on the faraday effect and. Electro optic modulators operation of electro optic modulators is based on the principle of induced birefringence.
An optical modulator is an optical device which is used to modulate a beam of light with a perturbation device. A magnetic field, like any vector field, singles out a specific direction in space. Electromagnetic optics optics is a branch of electromagnetism electromagnetic optics include both wave optics scalar approximation ray optics limit when. It is a kind of transmitter to convert information to optical binary signal through optical fiber optical waveguide or transmission medium of optical frequency in fiber optic communication. A novel highspeed magnetooptic mo modulator which consists of an integrated wire grid polarizer wgp, biyig waveguide with cladding layer and conducting microstrip line is proposed. Depending on the parameter of a light beam which is manipulated, modulators may be categorized into amplitude modulators, phase modulators, polarization modulators etc. Pdf we propose an ultrafast magnetooptic mo modulator for the sfqto optical digital interface. The cell contains uniaxial crystal, which becomes biaxial when electric field is applied. Measurement of magneto optic kerr effect using piezobirefringent modulator j. A strength of optical recording is that, unlike its magnetic counterpart it can support readonly, writeonce and erasable rewritable modes of data storage. Depending on the parameter of a light beam which is manip ulated, modu lators may be categorized into amplitude mod ulat ors, phase m odulators, polarization modulators etc. Usage area of electrooptic modulators modulating a laser beam. T he sensor head consist of only optical component.
Electrooptic devices have been developed for application in communications, 1 4 analog and digital signal processing, 5 information processing 6 optical computing, 6, 7 and sensing. The microcavity states in mpmeo are split and yield. A bragg configuration gives a single first order output beam, whose intensity is directly linked to the power of rf control signal. 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. Pixelated crystal of aluminum garnet switched by array of magnetic coils. If you have updated information about any of the organizations listed, please contact us. A magneto optic modulator with a magnetic fluid film inserted into an optical fiber sagnac interferometer is proposed. In this paper, the processes of magnetooptical modulation. Jul 01, 2009 overview of reference studies study polarizationinsensitive striploaded waveguide for electrooptic modulators and switches by jie sun,changming chen, lei gao, xiaoqiang sun,weinan gao,chunsheng ma and daming zhang pressed on optics communication 2822009 22552258. Acoustooptics is a phenomenon which deals with the interaction of light optics and sound acoustics. The mpmeo are composed of paramagnetic garnet and electro optic films sandwiched between two bragg mirrors.
Magnetooptic effect definition of magnetooptic effect by. Magnetooptic effect definition of magnetooptic effect. Study on magnetophotonic crystals for use in reflectiontype. 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. The electrooptic modulation requires the use of materials with high electrooptic coefficients, like linbo 3 or kd 2 po 4, widely employed for the fabrication of modulators in the telecommunications field. Magnetooptic modulators suppliers photonics buyers guide. Theoretical simulation and preparation of magnetooptical. Application of magnetooptic effects in magnetic materials. Printer inkjet cartridges, printer ink cartridge refill kits, laser toner cartridges and many more printer supplies. View pdf 322 kb pure magnetooptic diffraction by an array of periodic domains. Pdf we have successfully fabricated a basic magneto optical spatial light modulator moslm device driven by spintransferswitching sts, which we. Vast range of technologies for both photodetector and modulator. Magnetooptic definition is of, relating to, or utilizing the influence of a magnetic field upon light. This paper has presented yttrium iron garnet yigand lithium niobate linbo3 which are examined for use as awideband magnetooptic modulator.
Magnetooptical imaging of thin magnetic films using spins. To measure currents power stations and substations conventionally employ inductive type current transformers. We report on microcavities comprising paramagnetic garnet and electrooptic films mpmeo for modulation of the polarization rotation angle of light at nearuv wavelengths with a slight intensity change, with applying a low voltage. The discovery of magnetooptical effects evoked a new thought that the nature of light was an electromagnetic entity, and played a central role. Pdf a magnetooptical spatial light modulator driven by spin. We propose a novel magnetooptical approach for the repetition frequency stabilization of optical frequency combs. We report on microcavities comprising paramagnetic garnet and electro optic films mpmeo for modulation of the polarization rotation angle of light at nearuv wavelengths with a slight intensity change, with applying a low voltage. Pdf magnetooptic fiber sagnac modulator based on magnetic. The photonics buyers guide is a comprehensive resource for verified providers of magnetooptic modulators. Because the iron garnets are cubic, exhibit small values of linear magnetic birefringence, and offer great flexibility in ion substitutions and some flexibility in optical absorption values, these materials provide clear advantages over any. 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. Magneto optic effect synonyms, magneto optic effect pronunciation, magneto optic effect translation, english dictionary definition of magneto optic effect. The magnetic fluid exhibits variable birefringence and faraday effect under external magnetic field that will lead to a phase difference and polarization state rotation in the sagnac interferometer.
There are several methods to manipulate this device depending on the parameter of a light. The mpmeo are composed of paramagnetic garnet and electrooptic films sandwiched between two bragg mirrors. An accurate electric current transducer is a key component of any power system instrumentation. Electromagnetism and optics an introductory course richard fitzpatrick professor of physics the university of texas at austin. The magnetooptic modulator rotates a polarization of a light incident to a magnetooptic device which. Acousto optic modulators are used to vary and control laser beam intensity. The electro optic modulation requires the use of materials with high electro optic coefficients, like linbo 3 or kd 2 po 4, widely employed for the fabrication of modulators in the telecommunications field. Wide band magneto optical modulators in advanced high speed optical communication systems. Magneto optical effects in magnetic materials arise due to the optical anisotropy of the materials. The source of this optical anisotropy is the magnetisation m within surface domains which can be influenced.
Pdf we propose an ultrafast magnetooptic mo modulator for the sfqtooptical digital interface. Study on magnetophotonic crystals for use in reflectiontype magnetooptical spatial light modulators article in journal of applied physics 1037. Study on magnetophotonic crystals for use in reflection. An electrooptic modulator eom is an optical device in which a signalcontrolled element exhibiting an electrooptic effect is used to modulate a beam of light. Keywordsmagnetooptic modulation, faraday rotation effect, linbo3, yig, and ultra fast magnetic field. 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. An optical modulat or is a device which is used t o modula te a beam of light. Electromagnetism and optics university of texas at austin. The cell contains uniaxial crystal, which becomes biaxial when electric field. The signal is brought down by fiber optical cables to the signal processing unit therefore the.
Conventionally, optical modulators are realized by taking advantages of inherent material properties, including 1 electro optic effects in nonlinear optical materials linbo3 crystals or polymers that are found in fiber optic processors. Magnetooptical devices for optical integrated circuits, frontiers in guided wave optics and optoelectronics, bishnu pal, intechopen, doi. Magnetooptical modulation technology has become key component in many optical information systems. Osa magnetooptic modulator for high bandwidth cavity. Electrooptic modulators operation of electrooptic modulators is based on the principle of induced birefringence. The magnetooptic spatial light modulator moslm, commercially available through semetex corporation, has successfully been integrated into a variety of optical signal processing, optical pattern recognition, and optical computing applications. An arrangement for modulating a beam of light by passing it through a single crystal of yttrium iron garnet, which provides intensity modulation by using a magnetic field to produce optical rotation. The beam may be carried over free space, or propagated through an opti cal waveg uide op tical fibre. Modulation bandwidths extending into the gigahertz range are possible with the use of lasercontrolled modulators. Imaging the fields of magnetic materials provides crucial insight into the physical and chemical processes surrounding magnetism and has been a key ingredient in the spectacular development of. As a result, the intensity of the output light is modulated under the external. In such a medium, which is also called gyrotropic or gyromagnetic, left and rightrotating elliptical polarizations can propagate at different speeds.
Measurement of magnetooptic kerr effect using piezobirefringent modulator j. The photonics buyers guide is a comprehensive resource for verified providers of magneto optic modulators. Gallium arsenide, which has the potential to modulate at wave lengths as great as 16 microns, was found the most useful for laser modulation. Fully integrated magneto optic in fiber micro modulator longdom. Photoelastic modulator nonidealities in magnetooptical. Magnetooptic modulator and optical communication system using. Magnetooptic definition of magnetooptic by merriamwebster. Optical modulators with twodimensional layered materials.
Wide band magnetooptical modulators in advanced high speed optical communication systems. Materials for magnetooptic modulators springerlink. An optical modulator is a device which is used to modulate a beam of light. Osa paramagneto and electrooptic microcavities for blue. Magnetooptical devices for optical integrated circuits. The existence of an interaction between light and sound was discovered by brillouin in the. The magneto optic spatial light modulator moslm, commercially available through semetex corporation, has successfully been integrated into a variety of optical signal processing, optical pattern recognition, and optical computing applications. An electro optic modulator eom is an optical device in which a signalcontrolled element exhibiting an electro optic effect is used to modulate a beam of light. We present to the reader the mathematical formalism used to describe this phenomena as well as the common. The optic axis of this induced optical activity is aligned with the axis of the applied magnetic field. Construction of infiber modulator has high importance in optics. Magnetooptic modulators for nearinfrared radiation wavelength 11 to 55 nm are described.
Recent advances of wide band magnetooptical modulators. Osa paramagneto and electrooptic microcavities for. However, the growth of these materials is not compatible with standard microelectronic processes. The branch of physics that deals with phenomena associated with magnetic effects on matter as it emits light, having applications in computer. However, due to the abstract theoretical knowledge, many textbooks do not introduce the properties of circular anisotropy, so it is difficult for most students to understand the polarization properties of light accurately and in depth. Mo modulator based on the optical excitation of surface mag netoplasmon smp waves in. Detector modulator the incoherent light is detected as intensity, by a photodetector as an electrical change distribution. Consider, for example, the technology of optical audio video disks. Magnetooptic and electrooptic modulators international nuclear.
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. 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. Magnetooptical phase modulation in integrated machzehnder. Magnetooptics article about magnetooptics by the free. This charge distribution affects the modulator, and so changes the amplitudeor phaseof the re. Magnetooptic materials have unique physical properties that offer the opportunity of constructing devices with many special functions not possible from other photonic devices. Profiles and contact information for manufacturers and suppliers are provided by the companies and verified by our editors.
Providing supplies for printer brands like dell, epson, canon, hp, brother, xerox, samsung and many more. Electrooptic and magnetooptic modulators ntrs nasa. Recent advances of wide band magnetooptical modulators in. Magnetooptic fiber sagnac modulator based on magnetic fluids. B52 bombardier dash8 c5 c c140 crj700 dc10 e2 gulfstream iii kc10 kc5 md11 md80 p3 rq4 chosen by manufacturers, carriers and military fleets aerospatiale boeing canadair. Current status of the magnetooptic spatial light modulator. A gigahertz surface magnetoplasmon optical modulator. A magneto optic 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. The principal magnetooptic effects observed in ferromagnetio and ferri. Acoustooptical effects principles and applications.
Modifying and detecting the polarization of light is increasingly important in many contexts such as faraday isolators and electrooptical modulators. Magneto optic definition is of, relating to, or utilizing the influence of a magnetic field upon light. Single crystal garnets and sputtered films remain the basic material for nonreciprocal isolators, modulators and field sensors. Magnetooptical kerr e ect moke photonphoton spectroscopies absorption ii. The beam may be carried over free space, or propagated through an optical waveguide optical fibre. Di erent energy ranges probes di erent part of the electronic structure of the matter. Yttrium iron garnet yig is also examinedfor use as awideband magneto optic modulator. Magnetooptic fiber sagnac modulator based on magnetic fluids article pdf available in optics letters 368. Magnetooptic effect synonyms, magnetooptic effect pronunciation, magnetooptic effect translation, english dictionary definition of magnetooptic effect. Magnetooptical modulator article about magnetooptical. Modulator technology rei solid state dc switch modulator the radtec solid state dc switch modulator is the only modulator in the industry which is capable of taking full advantage of a klystrons ability to produce wide pulses with a high duty cycle. Maldonado department of electrical engineering the uni y ersity of texas at arlington arlington, texas 1 3. Magnetooptical phase modulation in integrated mach. Gallium arsenide, which has the potential to modulate at wave lengths as great as 16.
A wideband yig modulator has recently been developed which represents a great improvement over other magneto optic modulators. Magneto optical kerr e ect moke magneto optical kerr e ect moke jaroslav hamrle jaroslav. For waveguide devices the accurate coupling theory for hybrid modes in anisotropic waveguides and the technology. These modulators use the faraday effect in single crystals of. Magneto optic current transformer technology moct attish jain btech, eee, srm university kancheepuram kattankulathur 603203 abstract.
967 693 328 759 1271 1300 113 523 413 561 165 1108 733 1467 828 401 1323 386 1366 1003 767 221 310 763 694 898 132 1021 1373 737 468 384 1385 1217