基于超低损耗 Sb2Se3 相变材料的超薄 BIC 超表面
Ultrathin BIC metasurfaces based on ultralow-loss Sb2Se3 phase-change material
AI总结：
本文提出并制备了基于超低损耗相变材料 Sb2Se3 的 25 nm 超薄 BIC 超表面，在近红外区域实现 Q 因子高达 130 的可调谐谐振，并实验验证了其对上转换纳米颗粒光致发光的调制与偏振操控能力。
摘要：
相变材料（PCMs）因其能够通过固态相变调制光学特性，日益被视为可调谐光子器件的理想平台。超薄且低损耗的 PCMs 因其快速且更高效的相变能力，以及在可重构光子芯片、超表面、光调制器、传感器、光子存储器和神经形态计算中的应用而备受重视。然而，传统的 PCMs，如 GST、GSST、VO2 和 In3SbTe2，尽管针对可调谐超光学进行了优化，但在近红外（NIR）区域存在较高的固有损耗，限制了其在高品质因子（Q 因子）谐振超表面中的应用潜力。本文展示了利用超低损耗 PCM Sb2Se3 设计和制备可调谐连续域束缚态（BIC）超表面的工作。我们的 BIC 超表面厚度仅为 25 nm，在近红外区域实现了高调制深度和宽范围谐振调谐，Q 因子高达 130，且无需额外材料。在实验中，我们利用这些 BIC 超表面调制稀土掺杂上转换纳米颗粒的光致发光，降低了多光子光致发光的激发功率，并实现了发射偏振操控。这项工作为在近红外区域开发有源谐振超表面提供了一个有前景的平台，其广泛应用包括超分辨成像、光调制、超快开关、谐波产生、彩色滤波和光学传感。
英文摘要：
Phase-change materials (PCMs) are increasingly recognised as promising platforms for tunable photonic devices due to their ability to modulate optical properties through solid-state phase transitions. Ultrathin and low-loss PCMs are highly valued for their fast and more effective phase transitions and applications in reconfigurable photonic chips, metasurfaces, optical modulators, sensors, photonic memories, and neuromorphic computing. However, conventional PCMs such as GST, GSST, VO2, and In3SbTe2, despite optimisation for tunable meta-optics, suffer from high intrinsic losses in the near-infrared (NIR) region, limiting their potential for high quality factor (Q-factor) resonant metasurfaces. Here we present the design and fabrication of tunable bound states in the continuum (BIC) metasurfaces using the ultralow-loss PCM Sb2Se3. Our BIC metasurfaces, only 25 nm thick, achieve high modulation depth and broad resonance tuning in the NIR with high Q-factors up to 130, without the need for additional materials. Experimentally, we employ these BIC metasurfaces to modulate photoluminescence in rare earth-doped upconversion nanoparticles, reducing the excitation power for multiphoton photoluminescence and enabling emission polarisation manipulation. This work offers a promising platform for developing active resonant metasurfaces in the NIR region, with broad applications including super resolution imaging, optical modulation, ultrafast switches, harmonic generation, colour filtering, and optical sensing.
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