非局域超表面的热全息术

中文摘要 AI 辅助

热辐射和发光是最普遍的光源之一，然而由于其非相干特性，它们的性质难以调控。热发射控制的最新进展通过精心设计周期性纳米结构阵列，赋予了热致光以空间和时间相干性，以及对其偏振的控制。然而，非相干光的定制波前工程仍然是一个开放的挑战，因为它不仅需要足够的空间和时间相干性，还需要任意的局部相位控制，这在实验上转化为在非周期系统中维持长程晶格共振，同时保持其对局部相位扰动的鲁棒性。在这项工作中，我们解决了这一长期存在的限制，并展示了通过操纵集体离域共振中的局部几何相位，实现对单层非周期非局域超表面热发射波前的可编程矢量控制。我们通过演示热光束转向、自旋-动量锁定热聚焦和热矢量全息图的生成，例证了我们方法的波前整形能力，为热光提供了定制的空间和光谱控制。我们的平台解决了热发射工程中的挑战，并为无需外部相干光源或笨重装置的光产生和控制提供了途径。未来的工作可能将这一设计原理扩展到其他非相干发射系统，如光致发光和电致发光。

英文摘要

Thermal radiation and luminescence are among the most ubiquitous sources of light, yet their properties are difficult to engineer due to their incoherent nature. Recent advances in thermal emission control have endowed heat-generated light with spatial and temporal coherence, as well as control over its polarization, by judiciously patterning periodic arrays of nanostructures. However, custom wavefront engineering of incoherent light has remained an open challenge, as it requires not only sufficient spatial and temporal coherence but also arbitrary local phase control, which experimentally translates into sustaining long-range lattice resonances in aperiodic systems while maintaining their robustness against local phase perturbations. In this work, we address this longstanding limitation and demonstrate programmable vectorial control over the thermal emission wavefront from single-layer aperiodic nonlocal metasurfaces, realized by manipulating local geometric phases across a collective delocalized resonance. We exemplify the wavefront-shaping capabilities of our approach by demonstrating thermal beam steering, spin-momentum-locked thermal focusing and the generation of a thermal vectorial hologram, providing custom spatial and spectral control over thermal light. Our platform addresses challenges in thermal emission engineering and provides a route for light generation and control without the need for external coherent sources or bulky setups. Future work may extend this design principle to other incoherent emission systems, such as photo- and electroluminescence.

发表机构

• Advanced Science Research Center, City University of New York（纽约城市大学高级科学研究中心）
• Politecnico di Milano（米兰理工大学）
• Stevens Institute of Technology（史蒂文斯理工学院）
• University of Amsterdam（阿姆斯特丹大学）
• Graduate Center, City University of New York（纽约城市大学研究生中心）

机构由 AI 辅助整理，请以论文原文为准。