通过极化激元腔模式增强远场热发射
Enhancement of far-field thermal emission via polaritonic cavity modes
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中文总结 AI 辅助
该研究针对热发射调控的应用需求，利用表面声子极化激元与腔共振耦合产生的热激发导模（TEGMs），通过简单腔结构实现远场热发射增强，为调控热辐射提供了可扩展的实验与理论支撑。
中文摘要 AI 辅助
控制热发射对于热光伏、热传感、成像和伪装等应用至关重要。尽管 prior 研究聚焦于腔内热激发导模（TEGMs）的发射，但它们对腔外远场辐射的贡献仍未被探索。本文中，我们展示了由表面声子极化激元与腔共振耦合产生的 TEGMs 所实现的可调谐远场热通道。结合红外发射率实验与涨落电动力学模拟，我们识别出独特的光谱特征，标志着二维受限的极化激元模式向三维辐射通道的转变。我们发现，覆盖 SiO₂ 的硅腔在极化激元光谱共振附近可将发射率增强达 200%，而裸硅腔仅产生宽带增强。这些发现提供了 TEGMs 的实验证据，并确立了一种简单的腔结构作为无需复杂纳米加工即可调控热辐射的有效且可扩展平台。
英文摘要
Controlling thermal emission is crucial for applications involving thermophotovoltaics, thermal sensing, imaging, and camouflage. While prior studies focused on the emission of thermally excited guided modes (TEGMs) inside cavities, their contribution to the far-field radiation outside cavities has remained unexplored. Here, we demonstrate a tunable far-field thermal channel enabled by TEGMs arising from the coupling of surface phonon-polaritons and cavity resonances. By combining infrared emissivity experiments with fluctuational electrodynamics simulations, we identify distinct spectral features marking the conversion of two-dimensionally confined polaritonic modes into three-dimensional radiative channels. We find that silicon cavities covered with SiO2 enhance the emissivity by up to 200% near the polaritonic spectral resonance, whereas bare silicon cavities yield only broadband enhancement. These findings provide experimental evidence of TEGMs and establish a simple cavity architecture as an effective and scalable platform for tailoring thermal radiation without complex nanofabrication.
