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Applied Sciences
Special Issues
Applications of Magneto-Optical Materials
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Applications of Magneto-Optical Materials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (30 June 2019) | Viewed by 24504

Special Issue Editor

Dr. Durdu Guney

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, Michigan Technological University, Houghton, MI 49931, USA
Interests: metamaterials; plasmonics; photonic crystals; quantum information
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The use of magneto-optical materials in numerous devices and applications in diverse areas has been proposed, including isolators, circulators, modulators, optical switching, imaging, sensing, signal processing, data storage, quantum information, wave plates, phase shifting, nanoantennas, gyroscopes, and electromagnetic cloaks. In 1992, Betzig et al. demonstrated high density data storage in thin-film magneto-optical materials using near-field scanning optical microscopy. In 2005, Leuenberger, et al. proposed the quantum teleportation of many-qubit electron spin states based on a conditional single-photon Faraday rotation. In 2013, Davoyan and Engheta theoretically demonstrated a nanoscale miniaturized three-port circulator based on magnetoplasmonics. In the same year, Kort-Kamp et al. theoretically proposed the use of magneto-optical materials for tunable plasmonic cloaks that can be switched on and off or tuned to different operating frequencies. In 2014, Chou et al. used a ferromagnetic surface plasmon grating with an enhanced transverse magneto-optical Kerr effect to demonstrate highly sensitive molecular detection in a fluid medium. In 2015, Meda, et al. used a ghost imaging technique for the high quality magneto-optical imaging of samples under extreme conditions. In 2016, Baryshev and Merzlikin demonstrated a tunable plasmonic wave plate based on the magneto-optical effect. In 2017, Nakamura, et al. developed a magneto-optical modulator for the repetition frequency stabilization of optical frequency combs. Also in 2017, Karki et al. demonstrated thin-film magnetless Faraday rotators with 0.09 dB insertion loss and a 20 dB isolation ratio on silicon photonic substrates for possible application to on-chip optical isolators. In 2018, Higo et al. reported the first observation of the magneto-optical Kerr effect in an antiferromagnetic metal and used the effect to image magnetic octupole domains. These are only a glimpse of the large body of existing work in the field and do not represent by any means many other invaluable works. They are purely intended to provide a sense of what kind of devices and applications have been imagined so far using magneto-optical materials.

This Special Issue aims to explore novel theoretical and experimental proposals for the application of magneto-optical materials that are not only scientifically intriguing but also technologically relevant. The submission of papers is encouraged on miniaturized and/or magnetless on-chip optical isolators, circulators, and modulators. The miniaturization of these devices is key to next generation photonic integrated circuits. Other topics of interest include magneto-optical metamaterials, tunable magneto-optical devices, imaging, magnetoplasmonics, quantum information, and the inverse Faraday effect, among others.

Prof. Dr. Durdu Guney
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magneto-optical effect
  • Faraday effect
  • Kerr effect
  • nonreciprocity
  • isolator
  • modulator
  • circulator
  • metamaterials
  • magnetoplasmonics
  • imaging

Published Papers (5 papers)

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Research

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12 pages, 4055 KiB  
Article
Development of Heat Dissipation Multilayer Media for Volumetric Magnetic Hologram Memory
by Yuichi Nakamura, Pang Boey Lim, Taichi Goto, Hironaga Uchida and Mitsuteru Inoue
Appl. Sci. 2019, 9(9), 1738; https://doi.org/10.3390/app9091738 - 26 Apr 2019
Cited by 4 | Viewed by 2466
Abstract
Holographic memory is a strong candidate for next-generation optical storage, featuring high recording densities and data transfer rates, and magnetic hologram memory using a magnetic garnet, as the recording material is expected to be used as a rewritable and stable storage technology. However, [...] Read more.
Holographic memory is a strong candidate for next-generation optical storage, featuring high recording densities and data transfer rates, and magnetic hologram memory using a magnetic garnet, as the recording material is expected to be used as a rewritable and stable storage technology. However, the diffraction efficiency of magnetic holography depending on the Faraday rotation angle is insufficiently high for actual storage devices. To increase the diffraction efficiency, it is important to record deep magnetic fringes, whereas it is necessary to suppress the merging of fringes owing to heat diffusion near the medium surface. In this work, we investigated the recording process of magnetic holograms in detail with experiments and numerical simulations, and developed a multilayer media with transparent heat dissipation layers to record deep and clear magnetic holograms by controlling the heat diffusion generated during the thermomagnetic recording process. To suppress lateral heat diffusion near the medium surface, we designed and fabricated a multilayer magnetic medium in which the recording magnetic layers are discrete in a film, approximately 12-µm thick. This medium exhibited diffraction efficiency higher than that of the single-layer medium, and error-free recording and reconstruction were achieved using the magnetic assist technique. Full article
(This article belongs to the Special Issue Applications of Magneto-Optical Materials)
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15 pages, 361 KiB  
Article
Magnetooptics in Cylindrical Structures
by Štefan Višňovský
Appl. Sci. 2018, 8(12), 2547; https://doi.org/10.3390/app8122547 - 08 Dec 2018
Cited by 2 | Viewed by 2475
Abstract
Understanding magnetooptics in cylindrical structures presents interest in the development of magnetic sensor and nonreciprocal devices compatible with optical fibers. The present work studies wave propagation in dielectric circular cylindrical structures characterized by magnetic permeability and electric permittivity tensors at axial magnetization. The [...] Read more.
Understanding magnetooptics in cylindrical structures presents interest in the development of magnetic sensor and nonreciprocal devices compatible with optical fibers. The present work studies wave propagation in dielectric circular cylindrical structures characterized by magnetic permeability and electric permittivity tensors at axial magnetization. The Helmholtz equations deduced from the Maxwell equations in transverse circularly polarized representation provide electric and magnetic fields. With the restriction to terms linear in off-diagonal tensor elements, these can be expressed analytically. The results are applied to magnetooptic (MO) circular cylindrical waveguides with a step refractive index profile. The nonreciprocal propagation is illustrated on waveguides with an yttrium iron garnet (YIG) core and a lower refractive index cladding formed by gallium substituted yttrium iron garnet (GaYIG) at the optical communication wavelength. The propagation distance required for the isolator operation is about one hundred micrometers. The approach may be applied to other structures of cylindrical symmetry in the range from microwave to optical frequencies. Full article
(This article belongs to the Special Issue Applications of Magneto-Optical Materials)
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10 pages, 2905 KiB  
Article
Magnetic Field Effect of Near-Field Radiative Heat Transfer for SiC Nanowires/Plates
by Zhiyuan Shen, Hao Wu and Han Wang
Appl. Sci. 2018, 8(11), 2023; https://doi.org/10.3390/app8112023 - 23 Oct 2018
Cited by 2 | Viewed by 2483
Abstract
The SiC micro/nano-scale structure has advantages for enhancing nonreciprocal absorptance for photovoltaic use due to the magneto optical effect. In this work, we demonstrate the near-field radiative transfer between two aligned SiC nanowires/plates under different magnetic field intensities, in which Lorentz-Drude equations of [...] Read more.
The SiC micro/nano-scale structure has advantages for enhancing nonreciprocal absorptance for photovoltaic use due to the magneto optical effect. In this work, we demonstrate the near-field radiative transfer between two aligned SiC nanowires/plates under different magnetic field intensities, in which Lorentz-Drude equations of the dielectric constant tensor are proposed to describe the dielectric constant as a magnetic field applied on the SiC structure. The magnetic field strength is qualified in this study. Using local effective medium theory and the fluctuation-dissipation theorem, we evaluate the near-field radiation between SiC nanowires with different filling ratios and gap distances under an external magnetic field. Compared to the near-field heat flux between two SiC plates, the one between SiC nanowires can be enhanced with magnetic field intensity, a high filling ratio, and a small gap distance. The electric field intensity is also presented for understanding light coupling, propagation, and absorption nature of SiC grating under variable incidence angles and magnetic field strengths. This relative study is useful for thermal radiative design in optical instruments. Full article
(This article belongs to the Special Issue Applications of Magneto-Optical Materials)
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Review

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21 pages, 719 KiB  
Review
Verdet Constant of Magneto-Active Materials Developed for High-Power Faraday Devices
by David Vojna, Ondřej Slezák, Antonio Lucianetti and Tomáš Mocek
Appl. Sci. 2019, 9(15), 3160; https://doi.org/10.3390/app9153160 - 03 Aug 2019
Cited by 76 | Viewed by 10372
Abstract
We review the progress in the investigation of the Verdet constant of new magneto-active materials for the Faraday-effect-based devices used in high-power laser systems. A practical methodology for advanced characterization of the Verdet constant of these materials is presented, providing a useful tool [...] Read more.
We review the progress in the investigation of the Verdet constant of new magneto-active materials for the Faraday-effect-based devices used in high-power laser systems. A practical methodology for advanced characterization of the Verdet constant of these materials is presented, providing a useful tool for benchmarking the new materials. The experimental setup used for the characterization is a flexible and robust tool for evaluating the Faraday rotation angle induced in the magneto-active material, from which the Verdet constant is calculated based on the knowledge of the magnetic field and the material sample parameters. A general model for describing the measured Verdet constant data as a function of wavelength and temperature is given. In the final part of this review, we present a brief overview of several magneto-active materials, which have been to-date reported as promising candidates for utilization in the Faraday devices. This overview covers room-temperature investigations of the Verdet constant of several materials, which could be used for the ultraviolet, visible, near-infrared and mid-infrared wavelengths. Full article
(This article belongs to the Special Issue Applications of Magneto-Optical Materials)
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8 pages, 2693 KiB  
Review
Silicon Waveguide Optical Isolator with Directly Bonded Magneto-Optical Garnet
by Yuya Shoji and Tetsuya Mizumoto
Appl. Sci. 2019, 9(3), 609; https://doi.org/10.3390/app9030609 - 12 Feb 2019
Cited by 25 | Viewed by 4942
Abstract
Silicon waveguide optical isolators were fabricated by direct bonding of magneto-optical (MO) garnet. The technique allowed efficient MO phase shift owing to the use of single-crystalline garnet and negligibly thin interlayer on the silicon core layer. A Mach–Zehnder interferometer (MZI) provided optical isolation [...] Read more.
Silicon waveguide optical isolators were fabricated by direct bonding of magneto-optical (MO) garnet. The technique allowed efficient MO phase shift owing to the use of single-crystalline garnet and negligibly thin interlayer on the silicon core layer. A Mach–Zehnder interferometer (MZI) provided optical isolation utilizing the MO phase shift. High isolation, wide bandwidth, and temperature-insensitive operations had been demonstrated by tailoring the MZI design. Also, transverse electric (TE)–transverse magnetic (TM) mode converters were integrated to control operating polarization. In this paper, we reviewed these progresses on silicon waveguide optical isolators. Full article
(This article belongs to the Special Issue Applications of Magneto-Optical Materials)
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