Ultra-wideband chiroptical response by tri-layer anisotropic plasmonic metamaterial

Shahid Hussain, Xueyu Guan, Ruonan Ji, Shao-Wei Wang
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引用次数: 0

Abstract

Abstract The use of plasmonic chiral metamaterials for the control of circular polarization has the potential to replace conventional optical equipment for polarization-related applications. The ultra-broadband chiroptic response using plasmonic constituents is delivered by elaborate three-dimensional (3D) helical structures, nevertheless, their implementation is complicated, time-consuming, and poses a significant scaling difficulty at the nano level. Ultra-broadband response from planar constituents is particularly necessary as a means to circumvent the challenges of 3D metamaterials. Here we present a planar plasmonic structure composed of tri-layer anisotropic arrays constituting nanowires and cut-wires to generate dual overlapped chiral bands. Based on this tri-layer approach, we numerically realized ultra-broadband planar plasmonic metamaterials to function in the near- and mid-infrared regions with a bandwidth range of 1.38–3.07 µ m and 4.00–8.10 µ m, and maximum circular dichroism performance of 0.90 and 0.92 respectively. The structures are ultracompact, misalignments tolerant, and can be extended to additional spectral regions through structural engineering. The proposed metamaterial has the potential to be used in the creation of ultra-compact, high-performance devices for a wide variety of uses, such as those in the fields of optical communication, biological diagnosis, high-contrast polarization imaging, high-accuracy polarimetric measurements, and spectroscopy.
三层各向异性等离子体超材料的超宽带热力响应
利用等离子体手性超材料控制圆偏振有可能取代传统的光学设备用于与偏振相关的应用。利用等离子体成分的超宽带chirrotic响应是由精细的三维(3D)螺旋结构提供的,然而,它们的实现是复杂的,耗时的,并且在纳米水平上存在显着的缩放困难。平面成分的超宽带响应作为规避3D超材料挑战的一种手段尤为必要。本文提出了一种由纳米线和切割线组成的三层各向异性阵列组成的平面等离子体结构,以产生双重叠的手性带。基于这种三层方法,我们在数值上实现了超宽带平面等离子体超材料在近红外和中红外区域的工作,带宽范围为1.38 ~ 3.07µm和4.00 ~ 8.10µm,最大圆二色性分别为0.90和0.92。该结构是超紧凑的,误差容忍,并可以通过结构工程扩展到额外的光谱区域。所提出的超材料有潜力用于创建超紧凑、高性能的设备,用于各种用途,例如光通信、生物诊断、高对比度偏振成像、高精度偏振测量和光谱学领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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