AI 中文总结
本研究结合局域与非局域热超表面，在旋电半导体平台实现宽带双偏振非互易热辐射，为辐射能量转换器件发展提供新途径。
AI 中文摘要
非互易热辐射为解耦光谱方向吸收率与发射率提供了途径，从而为热光子系统带来新范式。然而在磁光平台中，本征的旋电响应通常将可观测的非互易性限制在横磁（TM）偏振，而横电（TE）偏振下无对应响应。本研究首次实验演示了一种局域热超表面策略，通过在旋电半导体平台中构建人工旋磁响应来激活TE偏振非互易性；进一步将该机制扩展至宽带双偏振工作，采用非局域热超表面，其结合了谐振器超胞与梯度掺杂的近零介电常数磁光多层膜。在TE偏振下，22-27μm波段维持显著的吸收率对比度；TM偏振下则覆盖19-27μm波段。该平台提供了一种基于机制的宽带双偏振非互易热吸收实现途径，为推进辐射能量转换器件开辟了新机遇。
英文摘要
Nonreciprocal thermal radiation offers a route to decouple spectral directional absorptivity and emissivity, thereby enabling new paradigms in thermal-photonic systems. However, in magneto-optical platforms, the intrinsic gyroelectric response generally confines observable nonreciprocity to transverse-magnetic (TM) polarization, while the transverse-electric (TE) response is absent. In this work, we experimentally demonstrate, for the first time, a local thermal metasurface strategy to activate TE-polarized nonreciprocity by creating artificial gyromagnetic response in a gyroelectric semiconductor platform. We further extend this mechanism to broadband dual-polarization operation employing a nonlocal thermal metasurface, which combines a resonator supercell with gradient-doped epsilon-near-zero magneto-optical multilayers. Pronounced absorptivity contrast is maintained over 22-27 μm for TE polarization and 19-27 μm for TM polarization. This platform provides a mechanism-based route to achieve broadband and dual-polarization nonreciprocal thermal absorption, opening new opportunities for advancing radiative energy-conversion devices.
