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首页> 美国卫生研究院文献>Nanoscale Research Letters >Polarization Converter with Controllable Birefringence Based on Hybrid All-Dielectric-Graphene Metasurface
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Polarization Converter with Controllable Birefringence Based on Hybrid All-Dielectric-Graphene Metasurface

机译：基于混合全介电石墨烯超表面的可控双折射偏振转换器

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Previous studies on hybrid dielectric-graphene metasurfaces have been used to implement induced transparency devices, while exhibiting high Q-factors based on trapped magnetic resonances. Typically, the transparency windows are single wavelength and less appropriate for polarization conversion structures. In this work, a quarter-wave plate based on a hybrid silicon-graphene metasurface with controllable birefringence is numerically designed. The phenomena of trapped magnetic mode resonance and high Q-factors are modulated by inserting graphene between silicon and silica. This results in a broader transmission wavelength in comparison to the all-dielectric structure without graphene. The birefringence tunability is based on the dimensions of silicon and the Fermi energy of graphene. Consequently, a linear-to-circular polarization conversion is achieved at a high degree of 96%, in the near-infrared. Moreover, the polarization state of the scattered light is switchable between right and left hand circular polarizations, based on an external gate biasing voltage. Unlike in plasmonic metasurfaces, these achievements demonstrate an efficient structure that is free from radiative and ohmic losses. Furthermore, the ultrathin thickness and the compactness of the structure are demonstrated as key components in realizing integrable and CMOS compatible photonic sensors.
机译：先前对混合介电石墨烯超表面的研究已用于实现感应的透明器件，同时基于捕获的磁共振表现出高Q因子。通常，透明窗是单波长的，不太适合偏振转换结构。在这项工作中，对具有可控双折射的杂化硅-石墨烯超表面的四分之一波片进行了数值设计。通过在硅和二氧化硅之间插入石墨烯可以调节磁模式共振和高Q因子的现象。与没有石墨烯的全介电结构相比，这导致了更宽的透射波长。双折射可调性基于硅的尺寸和石墨烯的费米能。因此，在近红外中以96％的高度实现了线性到圆偏振转换。此外，基于外部栅极偏置电压，散射光的偏振状态可在右旋和左旋圆偏振之间切换。与等离子超表面不同，这些成就证明了一种有效的结构，没有辐射和欧姆损耗。此外，超薄厚度和结构紧凑被证明是实现可集成和CMOS兼容光子传感器的关键组件。

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