We present an all-dielectric metadevice platform realized by combining an inverse electromagnetic design computational method with additive manufacturing. As opposed to conventional flat metasurface based devices that are composed of resonant building blocks resulting in narrow band operation, our design approach creates non-resonant, extremely broadband metadevices. We propose and demonstrate high-efficiency (transmission > 60%), using thin all-dielectric metadevices that are capable of polarization splitting, beam bending, and focusing. Experimental demonstrations are performed at millimeter-wave frequencies using 3D-printed metadevices, however our proposed platform can be readily applied to the design and fabrication of electromagnetic and photonic metadevices spanning microwave to optical frequencies.
Replacement of ensemble averaging by the use of a broadband source in scattering of light from a one-dimensional randomly rough interface between two dielectric media
Multiple glassy dynamics of a homologous series of triphenylene-based columnar liquid crystals -- A study by broadband dielectric spectroscopy and advanced calorimetry
Spectrally-tunable Dielectric Grating-based Metasurface for Broadband Planar Light Concentration
由于城市化，建筑物的能源消耗正在快速增长，而由可再生能源供电的净零能源建筑提供了一种绿色和可持续的解决方案。然而，摩天大楼和多层建筑的屋顶空间有限，这对太阳能光伏组件的大规模集成提出了挑战。传统的光致发光解决方案，如硅太阳能电池板，阻挡了可见光进入建筑物，使它们无法覆盖所有建筑物表面。在这里，我们展示了一种新型的电介质超颖表面（基于氮化硅光栅）作为平面光集中器。我们将该功能器件集成到透射可见光的窗户玻璃上，同时将太阳光的近红外部分（NIR）引导到玻璃窗户的边缘，在那里它可以通过小型PV模块转换为电力。利用光栅设计的灵活性，我们调整光谱，使近NIR阳光部分的引导，并实现偏振独立性证明使用有限差分时域模拟。实验上，我们观察到在NIR区域（700-1000 nm）中约5.25%的光导效率，使得大部分可见光部分被透射用于自然室内照明。将太阳能电池集成在窗户边缘，我们发现在面积为25 mm 2的原型上，近红外光的功率转换效率约为4.2%。我们确认，大部分的损失是由于吸收，散射和制造的不均匀性在大面积上，可以在未来进一步优化。这种结合了可再生能源发电、室内照明和建筑围护结构减少的功能性窗户可以缓解现代城市的城市热孤岛问题。
