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International Affairs Students Current Students Alumni Faculty/Staff Careers--> TOHOKU UNIVERSITYCREATING GLOBAL EXCELLENCE Search 日本語 Contact Tohoku University --> About Facts & Figures Facilities Organization Chart History President's Message Top Global University Project Designated National University Global Network Promotional Videos Academics Undergraduate Graduate Courses in English Exchange Programs Summer Programs Double Degree Programs Academic Calendar Syllabus Admissions Undergraduate Admissions Graduate Admissions Fees and Expenses Financial Aid Research Feature Highlights Research Releases University Research News Research Institutes Visitor Research Center Research Profiles Academic Research Staff Campus Life International Support Office IT Services Facilities Dining & Shops Campus Bus Clubs & Circles News University News Research--> Arts & Culture Health & Sports Campus & Community Press Release--> International Visit Alumni Careers Events Exhibits Music Special Event Lecture Alumni--> Map & Directions Campus Maps & Bus--> Facilities Map--> TOHOKUUNIVERSITY About Academics Admissions Research Campus Life News Events International Affairs Students Current Students Alumni Faculty/Staff Promotional Videos Subscribe to our Newsletter Map & Directions Contact Jobs & Vacancies Emergency Information Site Map 日本語 Close Home Research News New Transparent Magnetic Material Created by Adding Heat with a Laser Research News New Transparent Magnetic Material Created by Adding Heat with a Laser 2023-12-14 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 'Cerium-substituted Yttrium Iron Garnet (Ce:YIG)', a transparent magnetic material, employing a specialized laser heating technique," points out Taichi Goto, associate professor at Tohoku University'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 filmsAuthors: Hibiki Miyashita, Yuki Yoshihara, Kanta Mori, Takumi Koguchi, Pang Boey Lim, Mitsuteru Inoue, Kazushi Ishiyama, Taichi GotoJournal: Optical MaterialsDOI: 10.1016/j.optmat.2023.114530 Press release in Japanese Contact: Taichi GotoEmail: taichi.goto.a6tohoku.ac.jp --> Archives 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 Page Top About Tohoku University Academics Admissions Research Campus Life News Events International Affairs Students Alumni Promotional Videos Subscribe to our Newsletter Map & Directions Contact Tohoku University Jobs & Vacancies Emergency Information Site Map Privacy Policy Media Enquiries Parent & Family Support Public Facilities Contact Tohoku University