ベッターとは

  Menu TOHOKU Univ. Campus Map Directions Japanese About Us ▼ Message from the DeanEducational GoalUndergraduateGraduateResearch Purposes and ObjectivesHistoryFiguresAcademic and Other StaffStudentsInternational StudentsRevenueCareer PathsUndergraduateGraduateBrochuresNewsLetter Departments ▼ Departments Academics ▼ Field of StudyGraduateUndergraduateUndergraduate ProgramsMaster&＃039;s ProgramsDoctoral ProgramsExchange ProgramsResearch Student Admissions ▼ Programs and ApplicationApplication ProceduresUndergraduate ProgramsMaster&＃039;s ProgramsDoctoral ProgramsResearch StudentExchange ProgramsTuition and Other Fees International Affairs ▼ Scholarships and FundsEventsHandbook for International Students International Support Office(TU Support)Entry into Japansummer-programOfficesWork under Student VisaExtension of Period of Stay or Change of StatusHousingTutor SystemWaiver of FeesRequired Insurance for All International Students of Engineering SchoolCounseling Services in School of EngineeringHealthcare RoomJapanese Language ClassesStatus of residence when taking a leave of absenceSeeking employment after graduationStatus of Residence after Leaving Tohoku University Research ▼ PressreleaseTUNE HOME News The breakthrough is a step towards the development of next-generation magnetic devices that control light News The breakthrough is a step towards the development of next-generation magnetic devices that control light 2023/12/15 In a significant advancement in optical technology, researchers from Tohoku University and Toyohashi University of Technology have developed a new method for creating transparent magnetic materials using laser heating. This breakthrough, recently published in the journal Optical Materials, presents a novel approach to integrating magneto-optical materials with optical devices, a long-standing challenge in the field. "The key to this achievement lies in creating &＃39;Cerium-substituted Yttrium Iron Garnet (Ce:YIG)&＃39;, a transparent magnetic material, employing a specialized laser heating technique," points out Taichi Goto, associate professor at Tohoku University&＃39;s Electrical Communication Research Institute (RIEC) and co-author of the study. "This method addresses the key challenge of integrating magneto-optical materials with optical circuits without damaging them - a problem that has hindered advancements in miniaturizing optical communication devices." Magneto-optical isolators are vital for ensuring stable optical communication. They act like traffic directors for light signals, allowing them to move in one direction but not the other. Integrating these isolators into silicon-based photonic circuits is challenging due to the high-temperature processes typically involved. As a result of this conundrum, Goto and his colleagues focused their attention on laser annealing - a technique that selectively heats specific areas of a material by laser. This allows for precise control, influencing only the targeted regions without affecting surrounding areas. Laser heating setup for preparing a transparent magnetic material. ©Taichi Goto et al. Previous studies had used this to selectively heat bismuth-substituted yttrium iron garnet (Bi: YIG) films deposited on a dielectric mirror. This allows the Bi:YIG to crystalize without affecting the dielectric mirror. However, when working with Ce:YIG, an ideal material for optical devices due to its magnetic and optical properties, problems arise because exposure to the air results in unwanted chemical reactions. To avoid this, the researchers engineered a new device that heats materials in a vacuum, i.e., without air, using a laser. This allowed for precise heating of small areas (about 60 micrometers) without altering the surrounding material. "The transparent magnetic material created through this method is expected to significantly enhance the development of compact magneto-optical isolators, crucial for stable optical communication," adds Goto. "Additionally, it opens avenues for creating powerful miniaturized lasers, high-resolution displays, and small optical devices." Publication Details: Title: Vacuum laser annealing of magnetooptical cerium-substituted yttrium iron garnet films Authors: Hibiki Miyashita, Yuki Yoshihara, Kanta Mori, Takumi Koguchi, Pang Boey Lim, Mitsuteru Inoue, Kazushi Ishiyama, Taichi Goto Journal:Optical Materials DOI: 10.1016/j.optmat.2023.114530 Contact Division of Public Relations School of Engineering, Tohoku University E-mail:[email protected] News NewsNews ListAnnouncementsPressreleaseResearchAwardsVacancies   Top of the page Contact Sitemap Emergency Information Undergraduate Departments Mechanical and Aerospace Engineering Electrical, Information and Physics Engineering Applied Chemistry, Chemical Engineering and Biomolecular Engineering Materials Science and Engineering Civil Engineering and Architecture Graduate Departments Mechanical Systems Engineering Finemechanics Robotics Aerospace Engineering Quantum Science and Energy Engineering Electrical Engineering Communications Engineering Electronic Engineering Applied Physics Applied Chemistry Chemical Engineering Biomolecular Engineering Metallurgy Materials Science Materials Processing Civil and Environmental Engineering Architecture and Building Science Management Science and Technology Affiliated Educational and Research Facilities Fracture and Reliability Research Institute(FRRI) Research Center of Supercritical Fluid Terchnolody Micro/Nano-Machining Research and Education Center Innovation Plaza International Office (EngIO) Technical Division Tohoku University Engineering Library School of Engineering, Tohoku University 6-6, Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan © School of Engineering, Tohoku University Japanese About Us Message from the DeanEducational GoalUndergraduateGraduateResearch Purposes and ObjectivesHistoryFiguresAcademic and Other StaffStudentsInternational StudentsRevenueCareer PathsUndergraduateGraduateBrochuresNewsLetter Departments Departments Academics Field of StudyGraduateUndergraduateUndergraduate ProgramsMaster&＃039;s ProgramsDoctoral ProgramsExchange ProgramsResearch Student Admissions Programs and ApplicationApplication ProceduresUndergraduate ProgramsMaster&＃039;s ProgramsDoctoral ProgramsResearch StudentExchange ProgramsTuition and Other Fees International Affairs Scholarships and FundsEventsHandbook for International Students International Support Office(TU Support)Entry into Japansummer-programOfficesWork under Student VisaExtension of Period of Stay or Change of StatusHousingTutor SystemWaiver of FeesRequired Insurance for All International Students of Engineering SchoolCounseling Services in School of EngineeringHealthcare RoomJapanese Language ClassesStatus of residence when taking a leave of absenceSeeking employment after graduationStatus of Residence after Leaving Tohoku University Research PressreleaseTUNE News News List Announcements Pressrelease Vacancies Awards Emergenccy Access パンフレット・出版物 --> Campus Map Direction Contact Sitemap 関連サイトへのリンク 情報公開 Site Policy --> Tohoku University no cache