纳米谐振器热辐射截面的分级泊松分布实验研究
Experimental investigation of the thermal emission cross-section of nano-resonators using hierarchical Poisson-disk distributions
摘要：
纳米物体的有效截面是决定其与光相互作用能力的基本性质。然而，直接和定量地测量单个谐振器的它们仍然具有挑战性，特别是因为所涉及的信号非常低。在这里，我们实验测量的热发射截面的金属-绝缘体-金属纳米谐振器使用一个隐形超均匀分布的基础上分层泊松盘算法。在这样的分布中，天线之间没有长距离的相互作用，并且我们表明，由元表面发射的光表现为独立纳米天线的横截面的总和，从而能够直接检索单个谐振器的贡献。共振时的发射截面为$\mathbf{λ_0^2/3}$的量级，该值比单个粒子的理论最大吸收截面大近三倍，但仍小于最大消光截面。这种测量技术可以推广到任何单个谐振腔的截面，并且我们在这里也将其应用于消光截面。
英文摘要：
Effective cross-sections of nano-objects are fundamental properties that determine their ability to interact with light. However, measuring them for individual resonators directly and quantitatively remains challenging, particularly because of the very low signals involved. Here, we experimentally measure the thermal emission cross-section of metal-insulator-metal nano-resonators using a stealthy hyperuniform distribution based on a hierarchical Poisson-disk algorithm. In such distributions, there are no long-range interactions between antennas, and we show that the light emitted by the metasurface behaves as the sum of cross-sections of independent nanoantennas, enabling direct retrieval of the single resonator contribution. The emission cross-section at resonance is found to be of the order of $\mathbf{λ_0^2/3}$, a value that is nearly three times larger than the theroretical maximal absorption cross-section of a single particle but remains smaller than the maximal extinction cross-section. This measurement technique can be generalized to any single resonator cross-section, and we also apply it here to the extinction cross-section.
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