Non-local metasurface supporting geometric phases at bound states in the continuum (BIC) simultaneously enables sharp spectral resonances and spatial wavefront shaping, thus providing a diversified optical platform for multifunctional devices. However, a static nonlocal metasurface cannot manipulate multiple degrees of freedom (DOFs), making it difficult to achieve multifunctional integration and be applied in different scenarios. Here, we presented and demonstrated phase-change non-local metasurfaces that can realize dynamic manipulation of multiple DOFs including resonant frequency, Q values, band, and spatial wavefront. Accordingly, a metasurface integrating multiple distinct functions is designed, as a proof-of-concept demonstration. Utilizing the geometry phase of quasi-BIC and the tunability of vanadium dioxide (VO2), a dynamic meta-lens is achieved by tailoring spatial light response at quasi-BIC in the temperature range from room temperature to 53 °C. Simultaneously, the sharp Fano resonance of quasi-BIC enables the metasurface to serve as an optical sensor in the mid-infrared band, yielding a sensitivity of 7.96 THz/RIU at room temperature. Furthermore, at the metallic state of VO2 (80 °C), the designed metasurface converts into a mid-infrared broadband absorber, achieving higher than 80 % absorptivity and an average absorption of 90 % from 28.62 THz to 37.56 THz. The proposed metasurface enabling multifunctional performances in different temperatures can effectively improve the availability of devices and find more new and complex scenarios in sensing, imaging, and communications.

中文翻译：

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通过相变材料实现多功能集成的动态非局部超表面


支持连续介质中束缚态几何相位 （BIC） 的非局部超表面可同时实现尖锐的光谱共振和空间波前整形，从而为多功能器件提供多样化的光学平台。然而，静态的非局部超表面无法操纵多自由度 （DOF），难以实现多功能集成并应用于不同的场景。在这里，我们介绍并演示了相变非局部超表面，它可以实现多个自由度的动态操纵，包括谐振频率、Q 值、频带和空间波前。因此，设计了一种集成多种不同功能的超表面，作为概念验证演示。利用准 BIC 的几何相位和二氧化钒 （VO2） 的可调性，通过在室温至 53 °C 的温度范围内定制准 BIC 的空间光响应来实现动态超透镜。 同时，准 BIC 的尖锐 Fano 共振使超表面能够用作中红外波段的光学传感器，在室温下产生 7.96 THz/RIU 的灵敏度。此外，在 VO2 的金属态 （80 °C） 下，设计的超表面转化为中红外宽带吸收器，在 28.62 THz 至 37.56 THz 范围内实现高于 80% 的吸收率和 90% 的平均吸收率。所提出的能够在不同温度下实现多功能性能的超表面可以有效提高器件的可用性，并在传感、成像和通信方面找到更多新的和复杂的场景。