Absorption and Extinction Cross Sections and Photon Streamlines in the Optical Near-field

被引：15

作者：

Striebel, Moritz ^{[1
,2
]}

Wrachtrup, Joerg ^{[1
,2
,3
]}

Gerhardt, Ilja ^{[1
,2
,3
]}

机构：

[1] Univ Stuttgart, Inst Phys, Pfaffenwaldring 57, D-70569 Stuttgart, Germany

[2] Ctr Integrated Quantum Sci & Technol IQST, Pfaffenwaldring 57, D-70569 Stuttgart, Germany

[3] Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

关键词：

SINGLE MOLECULES; ENERGY-FLOW; DIPOLE; LIGHT; SPECTROSCOPY;

D O I：

10.1038/s41598-017-15528-w

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

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.

引用

页数：13

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