论文标题
横截面在光线散射中的变性
Degeneracy of cross sections in scattering of light
论文作者
论文摘要
我们从理论上和数字上证明，在具有线性极化的电磁平面波下，通常呈圆柱形被动散射器，单个能量图可以整合任意散射系统的吸收，散射和灭绝横截面，而不论内部配置，材料参数及其大小。对于具有确定谐振顺序的系统，沿着能量图的相应边界，不仅需要相同的散射系数的幅度，而且还需要其相位相同，也需要对应于超级吸附或超散射。对于由较大的谐振顺序组成的系统，能量图的域可以完全覆盖较低的系统。因此，具有不同谐振订单的系统可以提供相同的能量特性，反映了光散射中的能量退化特性。这种退化可以放松功能设计的自由度，例如能量收集，成像，传感设备。我们演示了基于真实材料的各种系统，以支持这一发现。
We theoretically and numerically prove that under an electromagnetic plane wave with linear polarization incident normally to cylindrical passive scatterers, a single energy diagram can integrate absorption, scattering, and extinction cross sections for arbitrary scattering systems, irrespective of internal configuration, material parameters, and its sizes. For a system with definite resonant orders, along the corresponding boundary of the energy diagram, not only the magnitudes of scattering coefficients, but also its phases, are required the same, corresponding to superabsorption or superscattering. For systems composed by larger resonant orders, the domain of the energy diagram can completely cover systems with lower one. Hence, systems with different resonant orders can provide the same energy characteristics, reflecting the energy degenerate property in light scattering. This degeneracy may relax more degrees of freedom in functional designs, such as energy harvesting, imaging, sensing devices. We demonstrate various systems based on real materials to support this finding.
