arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2408.08710physics.opticscond-mat.mes-hall
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用于高K自旋动力学选择性超快光学激发的磁光子波导纳米结构

Magnetophotonic waveguide nanostructure for selective ultrafast optical excitation of high-K spin dynamics

Savelii V. Lutsenko, Anastasia E. Khramova, Daria O. Ignatyeva, Daniil V. Konkov, Natalia S. Kaurova, Anatoly A. Syrov, Alexander L. Kudryashov, Grigory N. Golt… 展开作者

Savelii V. Lutsenko, Anastasia E. Khramova, Daria O. Ignatyeva, Daniil V. Konkov, Natalia S. Kaurova, Anatoly A. Syrov, Alexander L. Kudryashov, Grigory N. Goltsman, Vladimir N. Berzhansky, Vladimir I. Belotelov

AI总结:

针对光磁学中衍射极限限制自旋波波长的瓶颈,提出利用磁光子光栅产生亚衍射尺度逆法拉第效应分布的方法,实验实现300nm短自旋波激发,为光磁应用开辟新方向。

摘要:

光磁学为可在超快时间尺度下开展的无焦耳损耗自旋控制提供了一种极具前景的方法。然而,光磁学的核心瓶颈在于光无法被聚焦到比衍射极限更小的尺寸,这限制了光磁器件中光控磁比特的最小尺寸以及光激发自旋波的最短波长,进而阻碍了该领域的进一步发展。本文提出并通过实验验证了一种利用特殊设计的磁光子光栅选择性激发短交换自旋波的新方法。该方法的核心原理是:飞秒激光脉冲激发磁性薄膜中的光学导波TE模,从而在薄膜内产生符号交替的逆法拉第效应(IFE)分布。实验证实,该IFE分布的空间周期处于亚衍射尺度,可激发波长约300nm的窄带短自旋波,且其波长有望进一步降低至约100nm。这一成果为从逻辑元件到数据处理器件等广泛的光磁应用开辟了新方向。

英文摘要:

Optomagnonics provides a promising method of a Joule-loss-free spin control that can be performed at ultrafast timescale. However, the cornerstone of optomagnonics is impossibility to focus the light tighter than a diffraction limit. This constrains minimal size of the optically switched magnetic bits and minimal wavelengths of the optically excited spin waves in optomagnonic devices thus preventing its further progress. Here we propose and experimentally demonstrate a novel method of the selective optical excitation of the short exchange spin waves by using a specially designed magnetophotonic grating. This method is based on the creation of the sign-changing profile of the inverse Faraday effect (IFE) induced in a magnetic film due to excitation of the optical guided TE-mode by a femtosecond laser pulse. The spatial period of the IFE profile is subdiffractive which allows to launch narrow band short spin waves whose wavelengths are around 300 nm as was experimentally demonstrated and potentially can be made down to ~ 100 nm. This opens new horizons for optomagnetic applications that are wide ranging, from logical elements to data processing devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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