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Spatial interferometry, based on the measurement of total absorbed power, canbe used to determine the state of coherence of the electromagnetic field towhich any energy-absorbing structure is sensitive. The measured coherencetensor can be diagonalized to give the amplitude, phase, polarization patterns,and responsivities of the individual electromagnetic modes through which thestructure can absorb energy. Because the electromagnetic modes are intimatelyrelated to dynamical modes of the system, information about collectiveexcitations can be found. We present simulations, based on the Discrete DipoleApproximation (DDA), showing how the dynamical modes of systems of surfacedipoles can be recovered. Interactions are taken into consideration, leading tolong-range coherent phenomena, which are revealed by the method. The use of DDAenables the interferometric response of a wide variety of objects to bemodeled, from patterned photonic films to biological macromolecules.

Probing the Dynamical Behaviour of Surface Dipoles Through Energy Absorption Interferometry