Alù Andrea, Engheta Nader
Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jul;72(1 Pt 2):016623. doi: 10.1103/PhysRevE.72.016623. Epub 2005 Jul 26.
The possibility of using plasmonic and metamaterial covers to drastically reduce the total scattering cross section of spherical and cylindrical objects is discussed. While it is intuitively expected that increasing the physical size of an object may lead to an increase in its overall scattering cross section, here we see how a proper design of these lossless metamaterial covers near their plasma resonance may induce a dramatic drop in the scattering cross section, making these objects nearly "invisible" or "transparent" to an outside observer--a phenomenon with obvious applications for low-observability and noninvasive probe design. Physical insights into this phenomenon and some numerical results are provided.
讨论了使用等离子体和超材料覆盖层大幅降低球形和圆柱形物体总散射截面的可能性。虽然直观上预计增加物体的物理尺寸可能会导致其整体散射截面增加，但在这里我们看到，在接近其等离子体共振时对这些无损超材料覆盖层进行适当设计，可能会使散射截面急剧下降，使这些物体对外部观察者几乎“隐形”或“透明”——这一现象在低可观测性和非侵入性探头设计中有明显应用。文中提供了对这一现象的物理见解和一些数值结果。
