The realization of mid-infrared thermal radiation based on metamaterials insensitive to angle and polarization plays an important role in various thermal photonic applications. However, the challenges include the following: most previously designed thermal emitters usually contain metal components with unsatisfied physicochemical stability, accompanied with complex manufacturing technology. The present study proposes a mid-infrared thermal emitter at 3–6 μm wavelength range based on Fibonacci quasi-periodic structure, and a flat one-dimensional structure based on Fibonacci geometry resorting to ITO is designed. The proposed thermal emitter is, theoretically and experimentally, proven to possess good angular and polarization-independent selective thermal emission performance in a relatively wide infrared wavelength range. Furthermore, the good optical and high-temperature thermal stability of the designed thermal emitter is verified in the present experimental research. The thermal emitters proposed have advantages in polarization-independence without scale restraint and low cost but with wide vision. In summary, the present study provides a new tactics for obtaining non-metal spectral selective thermal emitters in a relatively wide wavelength range and thermal photonic applications under harsh conditions.

基于对角度和偏振不敏感的超材料实现中红外热辐射在各种热光子应用中发挥着重要作用。然而，挑战包括：大多数先前设计的热发射器通常包含物理化学稳定性不令人满意的金属成分，并伴随着复杂的制造技术。本研究提出了一种基于Fibonacci准周期结构的3-6 μm波长范围的中红外热发射器，并设计了一种基于Fibonacci几何的平面一维结构，采用ITO。所提出的热发射器在理论上和实验上都被证明在相对较宽的红外波长范围内具有良好的角度和偏振无关的选择性热发射性能。此外，本实验研究验证了所设计的热发射器良好的光学和高温热稳定性。所提出的热发射器具有偏振无关、无尺度限制和低成本但具有广阔视野的优点。总之，本研究为在较宽的波长范围内获得非金属光谱选择性热发射器和在恶劣条件下的热光子应用提供了一种新策略。