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Near-infrared dual-wavelength plasmonic switching and digital metasurface unveiled by plasmonic Fano resonance
Nanophotonics ( IF 6.5 ) Pub Date : 2020-11-11 , DOI: 10.1515/nanoph-2020-0511
Jie Ou 1 , Xiao-Qing Luo 1, 2 , You-Lin Luo 1 , Wei-Hua Zhu 1 , Zhi-Yong Chen 1 , Wu-Ming Liu 2, 3, 4 , Xin-Lin Wang 1, 5
Affiliation  

Abstract Plasmonic Fano resonance (FR) that contributes to multitudinous potential applications in subwavelength nanostructures can facilitate the realization of tunable wavelength selectivity for controlling light–matter interactions in metasurfaces. However, the plasmonic FR can be generated in metasurfaces with simple or complex geometries, and few of them can support flexible amplitude modulation and multiwavelength information transfer and processing. Here, we study the near-infrared plasmonic FR in a hybrid metasurface composed of concentrically hybridized parabolic-hole and circular-ring-aperture unit cells, which can induce polarization-dependent dual-wavelength passive plasmonic switching (PPS) and digital metasurface (DM). It is shown that the designable plasmonic FR can be realized by changing the geometric configurations of the unit cells. In particular, owing to the polarization-dependent characteristic of FR, it is possible to fulfill a compact dual-wavelength PPS with high ON/OFF ratios in the related optical communication bands. Moreover, such PPS that manipulates the amplitude response of the transmitted spectrum is an efficient way to reveal a 1-bit DM, which can also be rationally extended to a 2-bit DM or more. Our results suggest a pathway for studying polarization-dependent PPS and programmable metasurface devices, yielding possibilities for subwavelength nanostructures in optical communication and information processing.

中文翻译:

等离子体法诺共振揭示的近红外双波长等离子体开关和数字超表面

摘要 等离子体法诺共振 (FR) 有助于亚波长纳米结构中的众多潜在应用,可以促进实现可调谐波长选择性,以控制超表面中的光-物质相互作用。然而,等离子体 FR 可以在具有简单或复杂几何形状的超表面中产生,并且很少能支持灵活的幅度调制和多波长信息传输和处理。在这里,我们研究了由同心混合的抛物线孔和圆环孔径单位单元组成的混合超表面中的近红外等离子体 FR,它可以诱导偏振相关的双波长无源等离子体切换(PPS)和数字超表面(DM) )。结果表明,可以通过改变晶胞的几何构型来实现可设计的等离子体 FR。特别是,由于 FR 的偏振相关特性,可以在相关光通信波段实现具有高 ON/OFF 比的紧凑双波长 PPS。此外,这种操纵传输频谱幅度响应的 PPS 是揭示 1 位 DM 的有效方式,也可以合理地扩展到 2 位 DM 或更多。我们的结果表明了研究偏振相关 PPS 和可编程超表面器件的途径,为光通信和信息处理中的亚波长纳米结构提供了可能性。可以在相关光通信频段实现具有高开/关比的紧凑型双波长 PPS。此外,这种操纵传输频谱幅度响应的 PPS 是揭示 1 位 DM 的有效方式,也可以合理地扩展到 2 位 DM 或更多。我们的结果表明了研究偏振相关 PPS 和可编程超表面器件的途径,为光通信和信息处理中的亚波长纳米结构提供了可能性。可以在相关的光通信频段中实现具有高开/关比的紧凑型双波长 PPS。此外,这种操纵传输频谱幅度响应的 PPS 是揭示 1 位 DM 的有效方式,也可以合理地扩展到 2 位 DM 或更多。我们的结果表明了研究偏振相关 PPS 和可编程超表面器件的途径,为光通信和信息处理中的亚波长纳米结构提供了可能性。
更新日期:2020-11-11
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