Probing the dynamical behavior of surface dipoles through energy-absorption interferometry
Probing the dynamical behavior of surface dipoles through energy-absorption interferometry
复制标题
通过能量吸收干涉测量表面偶极子的动力学行为
DOI：
10.1103/physreva.86.043835
复制
发表时间：
2012
影响因子：
2.9
通讯作者：
Christopher N. Thomas
中科院分区：
文献类型：
--
作者：
S. Withington;Christopher N. Thomas
空间干涉测量法基于对总吸收功率的测量，可以用来确定任何吸能结构对其敏感的电磁场的相干状态。测量的相干张量可以对角化，以给出振幅、相位、极化模式和单个电磁模式的响应，通过这些模式，结构可以吸收能量。由于电磁模式与系统的动力模式密切相关，因此可以找到有关集体激励的信息。我们提出了基于离散偶极子近似（DDA）的模拟，展示了如何恢复表面偶极子系统的动力学模式。该方法考虑了相互作用，从而揭示了远程相干现象。DDA的使用使各种各样的物体的干涉响应能够建模，从图案化光子薄膜到生物大分子。
Spatial interferometry, based on the measurement of total absorbed power, can be used to determine the state of coherence of the electromagnetic field to which any energy-absorbing structure is sensitive. The measured coherence tensor can be diagonalized to give the amplitude, phase, polarization patterns, and responsivities of the individual electromagnetic modes through which the structure can absorb energy. Because the electromagnetic modes are intimately related to dynamical modes of the system, information about collective excitations can be found. We present simulations, based on the Discrete Dipole Approximation (DDA), showing how the dynamical modes of systems of surface dipoles can be recovered. Interactions are taken into consideration, leading to long-range coherent phenomena, which are revealed by the method. The use of DDA enables the interferometric response of a wide variety of objects to be modeled, from patterned photonic films to biological macromolecules.