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首页> 外文期刊>Journal of Applied Physics >Highly tunable bistability using an external magnetic field in photonic crystals containing graphene and magnetooptical layers
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Highly tunable bistability using an external magnetic field in photonic crystals containing graphene and magnetooptical layers

机译：使用外部磁场在包含石墨烯和磁光层的光子晶体中具有高度可调的双稳态

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摘要

In this paper, we propose an optical bistable structure based on a single graphene layer sandwiched between two magnetooptical layers which are located between two photonic crystals. It is indicated that such structure shows optical bistability behaviors, in the near infrared range, which can be efficiently controlled with small external magnetic fields lower than 1.5 mT. Such weak external magnetic fields cannot affect the graphene layer and the dependence of bistability phenomenon on the magnetic field results from the presence of magnetooptical layers and their influences on the resonance frequency of the structure. Both switch-up and switch-down thresholds can be significantly adjusted by variation of the external magnetic field. Furthermore, the width of hysteresis loop enhances with increasing the magnetic field. To obtain a high tunability of bistability with external magnetic fields, the thickness of magnetooptical layers should be larger than a special value. It is also found that the increase of the Fermi energy level of graphene leads to the enhancement of both switch-up and switch-down thresholds as well as the width of the hysteresis loop. Finally, it is confirmed that optical bistability can be manipulated by changing the incident illumination angle.
机译：在本文中，我们提出了一种基于双石墨烯层的光学双稳态结构，该石墨烯层夹在位于两个光子晶体之间的两个磁光层之间。结果表明，这种结构在近红外范围内显示出光学双稳态行为，可以用低于1.5 mT的小外部磁场有效地控制它。这种弱的外部磁场不会影响石墨烯层，并且双稳态现象对磁场的依赖性是由于磁光层的存在及其对结构共振频率的影响所致。接通和断开阈值均可通过外部磁场的变化进行显着调整。此外，磁滞回线的宽度随着磁场的增加而增加。为了获得与外部磁场的双稳态的高可调性，磁光层的厚度应大于特定值。还发现石墨烯的费米能级的增加导致开关阈值和开关阈值以及磁滞回线宽度的增加。最后，证实了可以通过改变入射照明角度来操纵光学双稳性。

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  • 来源
    《Journal of Applied Physics》 |2017年第2期|023105.1-023105.7|共7页
  • 作者

    Abbas Ghasempour Ardakani; Fatemeh Bahmani Firoozi;

  • 作者单位

    Department of Physics, College of Science, Shiraz University, Shiraz 71454, Iran;

    Department of Physics, College of Science, Shiraz University, Shiraz 71454, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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