Configuring the cancellation of optical near-fields

Configuring the cancellation of optical near-fields
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配置光学近场消除

DOI:
10.1117/12.796077
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发表时间:
2008
期刊:
--
影响因子:
--
通讯作者:
Andrews D
Andrews D
中科院分区:
--
文献类型:
--
作者:
Andrews D

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电磁场的特性近场行为是开放的各种解释。在经典意义上,术语“近场”可以用来表示一个区域,足够接近一些主要或次要来源,延迟特征的开始是微不足道的;量子理论的解释可能更多地集中在小距离操作的大动量不确定性上。总之,近场和波区(辐射)的功能完全容纳在一个延迟的共振传播张量,其中每个组件单独代表一个渐近极限-旁边的第三项,是明显的操作在距离可比的光波长。传播张量根据信号产生和检测中所涉及的多极水平而采取不同的形式。在本演示文稿中,延迟的传播张量的性质和对称性进行了探讨,参考各种形式的电相互作用,并显示如何适当的安排光束可以导致近场的完全取消。充分确定了这种行为的条件,并讨论了一些重要的光阱应用。
The characteristic near-field behavior of electromagnetic fields is open to a variety of interpretations. In a classical sense the term 'near-field' can be taken to signify a region, sufficiently close to some primary or secondary source, that the onset of retardation features is insignificant; a quantum theoretic explanation might focus more on the large momentum uncertainty that operates at small distances. Together, both near-field and wave-zone (radiative) features are fully accommodated in a retarded resonance propagation tensor, within which each component individually represents one asymptotic limit - alongside a third term that is distinctly operative at distances comparable to the optical wavelength. The propagation tensor takes different forms according to the level of multipole involved in the signal production and detection. In this presentation the nature and symmetry properties of the retarded propagation tensor are explored with reference to various forms of electric interaction, and it is shown how a suitable arrangement of optical beams can lead to the complete cancellation of near-fields. The conditions for such behavior are fully determined and some important optical trapping applications are discussed.
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