Materials World Network: Nonlinear Magnetophotonic Crystals

该材料世界网络项目专注于开发具有强非线性磁化率的新型磁性材料。 其目的是通过应力产生、成分梯度和在光子捕获存在下控制表面对谐波产生的贡献来增强铁氧体石榴石膜的非线性性能。 特别强调的是放置在光子晶体环境中的磁化诱导的二次和三次谐波产生。 该项目是莫斯科州立大学（Oleg Aktsipetrov）和密歇根理工大学（Miguel Levy）之间的合作成果，汇集了莫斯科集团在超快非线性光学方面的专业知识以及密歇根集团在集成（片上）磁光子晶体技术和磁性石榴石溅射薄膜生长方面的专业知识。 拟议的活动的智力价值是汇集不同的贡献，以提高其磁化诱导的非线性特性的材料系统的光学响应。 反转对称性破缺导致表面二次谐波产生，与光-物质相互作用增强慢光的性质相结合，产生强非线性效应。 特别注意的是，增加局部非均匀性在表面附近的单元格水平，以提高负责谐波产生的高阶磁化率。 这种材料和几何效应的结合通过RF磁控管溅射沉积和聚焦离子束铣削形成亚微米表面结构来利用应变对非线性响应的贡献。 对称性破坏机制和其他影响负责磁化引起的谐波产生的实验和理论解决。 现代光子学和光电子学要求器件的高度小型化，并提高其运行速度和降低成本。 该活动通过进一步开发具有强磁致非线性特性的新材料结构来实现这一目标。 磁化感应二次谐波已成为一个非常有前途的诊断工具，研究晶界和磁畴结构的新型计算机存储器件的基础上的巨磁电阻。 本计画旨在结合光子捕捉与新材料系统的发展，将此技术的解析度提升至亚微米级。该项目还与当地高中教师合作，向高中学生介绍纳米技术在光学中的作用。 密歇根理工大学利用与理工科学生比例偏低的学校的联系，扩大了在高中进行示威活动的推广计划的范围，包括卡斯技术高中的底特律学院和上半岛西部的基韦诺湾印第安社区。 这项活动还让高中女生参与光学和磁光学方面的科学发现项目。 这项工作是通过密歇根理工大学提供的妇女在工程夏季青年计划协调。 来自俄罗斯和美国的研究人员的国际交流预计将丰富参与该项目的研究生和本科生的教育内容。该奖项由国际科学与工程办公室共同资助。

This Materials World Network project focuses on the development of new magnetic materials with strong nonlinear magnetic susceptibility. Its aim is to enhance the nonlinear performance of ferrite garnet films by stress generation, compositional gradients and control of the surface contribution to harmonic generation in the presence of photon trapping. Special emphasis is placed on magnetization-induced second and third-harmonic generation in a photonic crystal environment. The project is a collaborative effort between Moscow State University (Oleg Aktsipetrov) and Michigan Technological University (Miguel Levy) that brings together the expertise in ultrafast nonlinear optics of the Moscow group and in integrated (on-chip) magneto-photonic crystal technology and magnetic garnet sputter film-growth of the Michigan group. The intellectual merit of the proposed activity is to bring together disparate contributions to the optical response of a materials system in order to enhance its magnetization-induced nonlinear properties. Inversion symmetry breaking responsible for surface second harmonic generation joins with the light-matter interaction enhancing properties of slow-light to produce strong nonlinear effects. Special attention is paid to increasing local non-uniformities at the unit cell level near the surface to enhance the high-order magnetic susceptibility responsible for harmonic generation. This combination of material and geometrical effects brings to bear through RF-magnetron sputter deposition and the formation of sub-micron surface structures by focused ion beam milling to leverage the strain contribution to the nonlinear response. Symmetry breaking mechanisms and other effects responsible for magnetization-induced harmonic generation are addressed experimentally and theoretically. Modern photonics and optoelectronics demand strong miniaturization of devices and increases in their operational speed and cost reduction. This activity contributes to this goal by furthering the development of new material structures with strong magnetically-induced nonlinear properties. Magnetization-induced second harmonic generation has become an extremely promising diagnostic tool for the study of grain boundaries and magnetic domain structure for novel computer memory devices based on giant magnetoresistance. This project aims to wed photon trapping and the development of novel materials systems to augment the resolution of this technology to the sub-micron regime. The project also works together with local area high-school teachers to bring information about the role of nanotechnology in optics to high school students. Michigan Tech uses its associations with schools that have high percentages of students from groups underrepresented in science and engineering to widen the scope of the outreach program of demonstrations taken to the high schools, including the Detroit Academy at Cass Technical High School and the Keweenaw Bay Indian Community in the western Upper Peninsula. The activity also involves high school women in science discovery projects in optics and magneto-optics. This effort is coordinated through the Women in Engineering Summer Youth Program offered by Michigan Tech. The international exchange of researchers from Russia and the U.S. is expected to enrich the education component for both graduate and undergraduate students participating in the project. This award is co-funded with the Office of International Science and Engineering.