Tunable structural transmissive color in fano-resonant optical coatings employing phase-change materials
Tunable structural transmissive color in fano-resonant optical coatings employing phase-change materials
复制标题
DOI：
10.1016/j.mtadv.2023.100364
复制
发表时间：
2023-02
影响因子：
10
通讯作者：
Yi-Siou Huang;C. Lee;Medha Rath;V. Ferrari;Heshan Yu;T. Woehl;J. Ni;I. Takeuchi;Carlos R'ios
中科院分区：
文献类型：
--
作者：
Yi-Siou Huang;C. Lee;Medha Rath;V. Ferrari;Heshan Yu;T. Woehl;J. Ni;I. Takeuchi;Carlos R'ios
可逆、非易失性和显著的折射率调制是硫系相变材料(PCM)实现的前所未有的性能组合。这种特性的结合使PCM成为一种快速增长的平台，可用于有源、低能量的纳米光子学，包括可调谐到其他无源薄膜光学涂层。在这里，我们将PCM Sb2Se3集成到一种新型的四层薄膜光学涂层中，该薄膜利用光子Fano共振来实现反射和透射的可调结构颜色。我们发现，与传统涂层相反，法诺共振光学涂层(FROCs)允许在相同的共振波长获得具有窄带峰值的透射型和反射型结构。此外，我们还展示了反射中的非对称光学响应，其中观察到的Fano共振和窄带滤波取决于入射光侧。最后，我们使用基于机器学习的多目标逆设计(ML)来提供具有优化结构的广泛的解集，同时提供关于基于PCM的FROC的性能限制的信息。新推出的Fano-Resonant光学涂层增加了可调谐性，在光谱和分束、同时反射和透射式显示器、衍射物和全息图方面开辟了各种应用。
Reversible, nonvolatile, and pronounced refractive index modulation is an unprecedented combination of properties enabled by chalcogenide phase-change materials (PCMs). This combination of properties makes PCMs a fast-growing platform for active, low-energy nanophotonics, including tunability to otherwise passive thin-film optical coatings. Here, we integrate the PCM Sb2Se3into a novel four-layer thin-film optical coating that exploits photonic Fano resonances to achieve tunable structural colors in both reflection and transmission. We show, contrary to traditional coatings, that Fano-resonant optical coatings (FROCs) allow for achieving transmissive and reflective structures with narrowband peaks at the same resonant wavelength. Moreover, we demonstrate asymmetric optical response in reflection, where Fano resonance and narrow-band filtering are observed depending upon the light incidence side. Finally, we use a multi-objective inverse design via machine learning (ML) to provide a wide range of solution sets with optimized structures while providing information on the performance limitations of the PCM-based FROCs. Adding tunability to the newly introduced Fano-resonant optical coatings opens various applications in spectral and beam splitting, and simultaneous reflective and transmissive displays, diffractive objects, and holograms.