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Large directional optical anisotropy in multiferroic ferroborate

机译：多铁铁硼酸盐中的大方向光学各向异性

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摘要

One of the most fascinating and counterintuitive recent effects in multiferroics is directional anisotropy, the asymmetry of light propagation with respect to the direction of propagation. In such case the absorption in a material can be different for opposite directions. Besides absorption, different velocities of light for different directions of propagation may be also expected, which is termed directional birefringence. In this work, we demonstrate large directional anisotropy in multiferroic samarium ferroborate. The effect is observed for linear polarization of light in the range of millimeter wavelengths, and it survives down to low frequencies. The dispersion and absorption close to the electromagnon resonance can be controlled by external magnetic field and are fully suppressed in one direction. By changing the geometry of the external field, samarium ferroborate shows giant optical activity, which makes this material a universal tool for optical control: with a magnetic field as an external parameter it allows switching between two functionalities: polarization rotation and directional anisotropy.
机译：多铁性学中最引人入胜且与直觉相反的最新效应之一是方向各向异性，即光传播相对于传播方向的不对称性。在这种情况下，材料在相反方向上的吸收可能会不同。除了吸收之外，还可以预期对于不同传播方向的不同光速，这被称为定向双折射。在这项工作中，我们证明了多铁性强硼酸mar中的大方向各向异性。对于毫米波长范围内的光的线性偏振，观察到了这种效应，并且该效应在低频下仍然存在。可以通过外部磁场控制接近于电磁子共振的色散和吸收，并在一个方向上完全抑制了色散和吸收。通过改变外场的几何形状，铁硼酸sa显示出巨大的光学活性，这使该材料成为光学控制的通用工具：以磁场作为外部参数，它可以在两种功能之间切换：极化旋转和方向各向异性。

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  • 来源
    《Physical review》 |2015年第18期|184409.1-184409.8|共8页
  • 作者

    A. M. Kuzmenko; V. Dziom; A. Shuvaev; Anna Pimenov; M. Schiebl; A. A. Mukhin; V. Yu. Ivanov; I. A. Gudim; L. N. Bezmaternykh; A. Pimenov;

  • 作者单位

    Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia;

    Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria;

    Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria;

    Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria;

    Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria;

    Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia;

    Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia;

    L. V. Kirensky Institute of Physics, Siberian Branch of RAS, 660036 Krasnoyarsk, Russia;

    L. V. Kirensky Institute of Physics, Siberian Branch of RAS, 660036 Krasnoyarsk, Russia;

    Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria;

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  • 正文语种 eng
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  • 关键词

    magnetooptical effects; spin waves; birefringence;

    机译：磁光效应;自旋波双折射;

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