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Broadband quarter-wave plate based on dielectric-embedded plasmonic metasurface

机译：基于电介质嵌入等离子体超表面的宽带四分之一波片

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High transmission plasmonic and all-dielectric metasurface wave plates have been reported in recent studies. However, narrow bandwidth and low polarization conversion need to be addressed to attain even better operation requirements. In this work, we numerically demonstrate the concept of an ultrathin single layer plasmonic metasurface embedded with dielectric resonators. Our design is based on the transmission line theory and surface plasmon excitation to realize a quarter-wave plate with controllable birefringence. The controllability is achieved through manipulating relative permittivity of a non-dispersive dielectric material-embedded in a perforated silver film, and the surface dimensions of silver. We have also achieved higher degrees of linear-to-circular and circular-to-linear polarization conversions at broadband wavelengths in the near infrared compared with other conventional plasmonic metasurfaces. Moreover, the functioning of the wave plate is demonstrated on a compact and ultrathin metasurface showing great potential of integration into photonic sensors.
机译：在最近的研究中已经报道了高透射等离子体和全电介质超表面波板。然而，需要解决窄带宽和低极化转换以达到更好的操作要求。在这项工作中，我们以数值方式演示了嵌入电介质谐振器的超薄单层等离子体超颖表面的概念。我们的设计基于传输线理论和表面等离子体激元激发，以实现可控双折射的四分之一波片。可控性是通过控制嵌入在穿孔银膜中的非分散介电材料的相对介电常数以及银的表面尺寸来实现的。与其他常规等离子超颖表面相比，我们在近红外的宽带波长处还实现了更高程度的线性到圆形和圆形到线性的偏振转换。此外，在紧凑，超薄的超表面上展示了波片的功能，显示出集成到光子传感器中的巨大潜力。

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