The mo modulator can not only work as an intensity modulator when combined with two linear polarizer, but can. Optical and magnetooptical properties of gd x fe 100x. Thus, it is well matched to digital optical coherent storage and processing technology. We propose a novel magnetooptical approach for the repetition frequency stabilization of optical frequency combs. Low power field generation for magnetooptic fiberbased interferometric switches john pritchard,a mani mina, robert j. A gigahertz surface magnetoplasmon optical modulator.
Pdf magnetooptical modulator for superconducting digital output. A microwave microstrip line is formed on the magneto optic material and carries a signal from the. Optical modulators with 2d layered materials nature. Waveguidebased electroabsorption modulator performance. The discovery of magnetooptical effects evoked a new thought that the nature of light was an electromagnetic entity, and played a central role. We havedeeply investigated the recent advances of wide band magneto optical modulators in advanced high speed optical communication systems over wide range of the affecting operating parameters as shown in table 1. We have successfully fabricated a basic magneto optical spatial light modulator moslm device driven by spintransferswitching sts, which we call spinslm technology. Keywordsmems, faraday effect, inductor, coil, faraday rotator, polarization controller, magnetooptic spatial light modulator, bismuthsubstituted yttrium iron garnet. Twodimensional magnetooptic spatial light modulator for. Faraday rotators that employ the magnetooptic effect are ubiquitous across several optical device categories. We confirmed successful switching of the individual free layers, which was controlled by sts. However, faraday rotators are notoriously difficult to fabricate at small scales due to the high magnetic field strengths required to generate significant light polarization vector rotations.
Pdf a gigahertz surface magnetoplasmon optical modulator. Refractive modulators most often make use of electrooptic effect, other modulators are made with acoustooptic effect, magnetooptic effect such as faraday and cottonmouton effects. There are very different kinds of optical modulators. A gigahertz surface magneto plasmon optical modulator.
The sample was coated by a thin au film in order to excite plasmons at the free au surface. The original magneto optic modulator employed in our experiments consists of a. Magnetooptic fiber sagnac modulator based on magnetic fluids. This modulator does not induce mechanical resonances and as such has the. By exploiting the electroabsorption effect of graphene, we present a graphenebased polarizationinsensitive optical modulator. Magnetooptic modulators for nearinfrared radiation wavelength 1.
Magnetooptic modulator and optical communication system using. Magnetooptic modulator for high bandwidth cavity length. This work offers comprehensive coverage of all aspects of spatial light modulators, from the various optical materials used for modulation, through the availability and characteristics of specific devices, to the main applications of slms and related systems. A magnetooptic trap confines and cools atoms by means of nearresonant. Electrooptic modulators exploit the electrooptic effect in a pockels cell.
They are used for switching or continuously adjusting the amplitude of a laser beam, for shifting its optical frequency, or its spatial direction. 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. Techniques are described for a device that includes an optical channel configured to transport an optical signal. Wideband magnetooptic modulation in a bismuthsubstituted. Electrooptic and magnetooptic modulators ntrs nasa. A magnetooptic effect is any one of a number of phenomena in which an electromagnetic. Mo modulators in integrated optics 8, the possibility of a free space mo modulator has not been widely investigated.
Lightactivated ultrafast magnetooptic modulator lightactivated ultrafast magnetooptic modulator yang, chiaen 20080828 00. Acoustooptic modulators are based on the acoustooptic effect. More than 210fr atoms have now been contained in a magnetooptic trap. Operating parameters for magneto optical modulators.
This modulator is capable of 1 ns modulation speed and has a. Introduction the spatial light modulator slm is a category of optical device that spatially transforms an input. Index terms magnetooptic modulation, faraday rotation effect, linbo3, yig, and ultra fast magnetic field. Pdf measurement of magnetooptical kerr effect using.
Our mo modulator is based on the faraday effect and consists of a microwave microstrip line msl. Recent advances of wide band magnetooptical modulators. The same magnetooptical polarization rotation principle can be applied to. They are strain free as grown, and easily cut and polished flat to 110 wavelength of, say, the yellow line of. It typically contains one or two pockels cells, and possibly additional optical elements such as polarizers. The magnetooptic modulator rotates a polarization of a light incident to a magnetooptic. The slm device is comprised of a one dimensional tenpixel light modulation array 1. Fejer department of applied physics, stanford university, stanford, california 94305 a technique for measuring the faraday effect and the magnetooptic kerr effect has been developed. Acoustooptic modulator wikimili, the best wikipedia reader. The acoustooptic intermodal scattering is enabled over the linear part of the racetrack resonator. An optical modulator is a device which is used to modulate a beam of light. The finite difference beam propagation method is employed for numerical calculations, which is the most widely used propagation technique for modeling integrated and photonic devices. Magneto optical modulator for superconducting digital output interface. Simulation of magnetooptical properties of magnetic.
Thermally induced inhomogeneous refractiveindex distribution of the cladding polymer controllably attenuates the graphene based longrange surface plasmon waveguide for light modulation. Materials for magnetooptic modulators springerlink. Recent advances of wide band magnetooptical modulators in. Conceptual schematic of the direction reconfigurable nonreciprocal acoustooptic modulator. Incident light penetrating the transparent top electrode can be modulated due to its magnetooptic kerr effect with the gdfe free layer. A thin magnetic garnet film is epitaxially deposited on a transparent nonmagnetic garnet substrate, in the manner of magnetic bubble memory films. The modulator is formed by depositing a magnetooptic material such as euse onto a superconducting ground plane such as that of the circuit. These modulators use the faraday effect in single crystals of yttrium iron garnet. A magnetooptic trap for rubidium oregon state university. We propose a novel magneto optical approach for the repetition frequency stabilization of optical frequency combs. Magneto optic modulators for nearinfrared radiation wavelength 1.
Resonant laser light can exert a force on free atoms by means of the momentum exchange during an absorptionemission cycle. Magnetooptic modulator for high bandwidth cavity length stabilization. Highresolution magnetooptic measurements with a sagnac interferometer invited a. An allinclusive tunable optical transmitter integrated on a single chip is proposed. The recent realization that 2d layered materials could modulate light with superior performance has prompted intense research and significant advances. An electrooptic modulator eom or electrooptic modulator is a device which can be used for controlling the power intensity modulators, phase phase modulators or polarization of light with an electrical control signal. Electro optic modulator an electrooptic modulator is a device which can be used for controlling the power, phase or polarization of a laser beam with an electrical control signal. This electrically alterable magnetooptic device can be used as a twodimensional spatial light modulator in an optical image processor or a display system. They are strainfree as grown, and easily cut and polished flat to 110 wavelength of, say, the. Magnetooptical modulator for superconducting digital output interface. Pdf a magnetooptical spatial light modulator driven by spin. The beam may be carried over free space, or propagated through an optical waveguide optical fibre.
A magnetooptical spatial light modulator driven by spin. Magnetooptic modulator and optical communication system. The rubidium vapor cell was provided, but i had to wind. We propose a kind of magnetic photonic crystal mpc slab waveguide made from magnetooptical material, namely bismuth iron garnet.
Compared to the mature alloptical and electricaloptic modulation schemes, the magnetooptic modulator has not received so much attention due to fabrication and operation complexity. Rp photonics encyclopedia optical modulators, acousto. The magnetic material is configured to receive an electrical signal that sets a magnetization state of the magnetic material. Nasa technical note electrooptic and magnetooptic modulators by e. 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. Direction reconfigurable nonreciprocal acoustooptic. Modulation the amount of laser light diffracted to the first order beam depends on the amplitude of the acoustic waves that diffract the incident laser beam, and t. Measurement of magneto optical kerr effect using piezobirefringent modulator article pdf available in japanese journal of applied physics 2012. Combining 5 and 17 and assuming a collisionfree plasma. The modulator performance is comprehensively studied in terms of attenuation, insertion. The modulator is formed by depositing a magneto optic material such as euse onto a superconducting ground plane such as that of the circuit. Pdf we propose an ultrafast magnetooptic mo modulator for the. We also find that performance scales with modal waveguide confinement. Highspeed current transients are used to switch the inplane magnetization of the film, which modulates an 800 nm optical beam.
Crystals using photoelastic modulation polarization. Magnetooptical modulator for superconducting digital. The application of yttrium iron garnet as a laser qswitch is also discussed. 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. Magnetooptical modulator for superconducting digital interface. A scanning, allfiber sagnac interferometer for high. Tne photoelastic modulator pem has become a standard tool for polarimetric measurements. Thus, we find highest energybandwidthratio modulator designs. A microwave microstrip line is formed on the magnetooptic material and carries a signal from the. Highresolution magnetooptic measurements with a sagnac. The device further includes a magnetic material with low optical absorption through which a portion of the optical signal is configured to flow. Weber, and sasha kemmet electrical and computer engineering department, iowa state university, ames, iowa 50011, usa.
We havedeeply investigated the recent advances of wide band magneto optical modulators in advanced high. We propose an ultrafast magnetooptic mo modulator for the sfqtooptical digital interface. Rp photonics encyclopedia electrooptic modulators, eom. Optical modulators based on 2d materials sciencedirect. A magneto optic modulator modulates signals from a superconducting circuit such as a singlefluxquantum sfq logic system onto a carrier wave light beam. A magnetooptic modulator modulates signals from a superconducting circuit such as a singlefluxquantum sfq logic system onto a carrier wave light beam. Previous designs have incorporated free space components which are bulky and di. Design of graphenebased polarizationinsensitive optical. Optical modulators with twodimensional layered materials. Osa magnetooptic modulator for high bandwidth cavity. A magnetooptical spatial light modulator driven by spin transfer switching for.
Magnetooptic modulators refer to those employing magnetooptic effects such as the faraday effect64, 65 or magnetooptic kerr effect 64 for light modulation. The acoustooptic modulator can therefore be used to deflect beams of polychromatic light into co mponent colors or wavelengths, in a manner reminiscent of the dispersive prism. The original magnetooptic modulator employed in our experiments consists of a. We present a tunable wideband bismuthsubstituted yttrium iron garnet biyig waveguide magnetooptic mo modulator. Low power field generation for magnetooptic fiberbased. However, existing pem techniques for characterizing magnetooptic materials are strictly valid only when the degree of polarization is unchanged by the material being characterized 1,2. Depending on the parameter of a light beam which is manipulated, modulators may be categorized into amplitude modulators, phase modulators, polarization modulators etc. Pdf a magnetooptic modulator with a magnetic fluid film inserted into an optical fiber sagnac interferometer is proposed. The performance improvement on the material side is fundamentally limited by the oscillator sum rule and thermal broadening of the fermidirac distribution.
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