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  • 标题:Absorption and Extinction Cross Sections and Photon Streamlines in the Optical Near-field
  • 本地全文:下载
  • 作者:Moritz Striebel ; Jӧrg Wrachtrup ; Ilja Gerhardt
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2017
  • 卷号:7
  • 期号:1
  • 页码:15420
  • DOI:10.1038/s41598-017-15528-w
  • 语种:English
  • 出版社:Springer Nature
  • 摘要:The optical interaction of light and matter is modeled as an oscillating dipole in a plane wave electromagnetic field. We analyze absorption, scattering and extinction for this system by the energy flow, visualized as streamlines of the Poynting vector. Depending on the dissipative damping of the oscillator, a part of the streamlines ends up in the dipole. Based on a graphical investigation of the streamlines, this represents the absorption cross section, and forms a far-field absorption aperture. In the near-field of the oscillator, a modification of the aperture is observed. As in the case for a linear dipole, we model the energy flow and derive the effective absorption apertures for an oscillator with a circular dipole characteristics - such as an atom in free space.
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