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Composite Multilayer Shared-Aperture Nanostructures: A Functional Multispectral Control
ACS Photonics ( IF 6.5 ) Pub Date : 2018-01-30 00:00:00 , DOI: 10.1021/acsphotonics.7b01441 Ali Forouzmand 1 , Hossein Mosallaei 1
ACS Photonics ( IF 6.5 ) Pub Date : 2018-01-30 00:00:00 , DOI: 10.1021/acsphotonics.7b01441 Ali Forouzmand 1 , Hossein Mosallaei 1
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There is a growing demand in the field of metasurfaces to design and implement functional multispectral devices capable of complex beam conversion and high-capacity optical information processing. Control over the size of the aperture footprint, fabrication complexity, and fundamental cross-talk poses great challenges toward the realization of these multifunctional multispectral optical devices. Here, we demonstrate a systematic design strategy and a full roadmap toward implementation of a novel class of nanoantenna arrays based on the multilayer shared-aperture concept, which can simultaneously multiplex multiwavelengths into a single optical device platform. The idea is supported by engineering two dual-layer metasurface-based designs with the capability of superdistinct operating channels (lying in the thermal infrared and visible spectra) and superclose operating channels (both lying in the visible spectrum) to simultaneously and independently perform anomalous or similar wavefront manipulation at two predesigned wavelengths. We leverage transparent conducting oxide (TCO)–dielectric and plasmonic–dielectric composite multilayer nanostructures to realize the aforementioned designs, respectively. The challenges such as coupling effects among the different wavelengths, compactness, fabrication feasibility, and material frequency dispersion are thoroughly addressed by careful selection of constituent materials and geometrical shape of resonators, array architecture, and optimization of structural parameters of inclusions. As a proof of concept, we have designed two dual-wavelength holographic metalenses generating images located in-plane and out-of-plane at two selected wavelengths. The proposed technique is in particular of interest in the fields of data storage, information processing, and displays.
中文翻译：
复合多层共享孔径纳米结构：功能多光谱控制。
在超颖表面领域中，对设计和实现能够进行复杂光束转换和大容量光学信息处理的功能性多光谱设备的需求日益增长。控制孔径足迹的大小，制造复杂性和基本串扰对实现这些多功能多光谱光学器件提出了巨大的挑战。在这里，我们展示了一种基于多层共享孔径概念的新颖设计纳米天线阵列的系统设计策略和完整路线图，该阵列可以同时将多波长复用到单个光学设备平台中。通过设计两个基于超表面的双层设计来支持该思想，该设计具有超清晰的工作通道（位于热红外和可见光谱中）和超近的工作通道（均位于可见光谱中）能够同时并独立地执行异常或在两个预先设计的波长处进行类似的波前操纵。我们利用透明导电氧化物（TCO）-电介质和等离子-电介质复合多层纳米结构分别实现上述设计。仔细选择组成材料和谐振器的几何形状，阵列架构，和优化夹杂物的结构参数。作为概念的证明，我们设计了两个双波长全息金属感测器，以生成在两个选定波长处的面内和面外图像。所提出的技术尤其在数据存储，信息处理和显示领域中令人感兴趣。
更新日期：2018-01-30
中文翻译：
复合多层共享孔径纳米结构：功能多光谱控制。
在超颖表面领域中，对设计和实现能够进行复杂光束转换和大容量光学信息处理的功能性多光谱设备的需求日益增长。控制孔径足迹的大小，制造复杂性和基本串扰对实现这些多功能多光谱光学器件提出了巨大的挑战。在这里，我们展示了一种基于多层共享孔径概念的新颖设计纳米天线阵列的系统设计策略和完整路线图，该阵列可以同时将多波长复用到单个光学设备平台中。通过设计两个基于超表面的双层设计来支持该思想，该设计具有超清晰的工作通道（位于热红外和可见光谱中）和超近的工作通道（均位于可见光谱中）能够同时并独立地执行异常或在两个预先设计的波长处进行类似的波前操纵。我们利用透明导电氧化物（TCO）-电介质和等离子-电介质复合多层纳米结构分别实现上述设计。仔细选择组成材料和谐振器的几何形状，阵列架构，和优化夹杂物的结构参数。作为概念的证明，我们设计了两个双波长全息金属感测器，以生成在两个选定波长处的面内和面外图像。所提出的技术尤其在数据存储，信息处理和显示领域中令人感兴趣。
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