Anomalous behavior of spectra near phase singularities of focused waves.
Anomalous behavior of spectra near phase singularities of focused waves.
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DOI：
10.1103/physrevlett.88.013901
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发表时间：
2001-12
影响因子：
8.6
通讯作者：
G. Gbur;T. Visser;E. Wolf
中科院分区：
文献类型：
--
作者：
G. Gbur;T. Visser;E. Wolf
结果表明，在孔径处衍射的会聚的、空间完全相干的多色波的焦点附近的相位奇点附近发生了显着的光谱变化。特别是，当孔径中波的频谱由具有窄高斯分布的单线组成时，相位奇点附近的频谱（即，某些特定频谱分量的零强度点附近）沿着奇点周围的闭环发生剧烈变化。光谱在某些点发生红移，在其他点发生蓝移，并在其他地方分成两条线。
It is shown that remarkable spectral changes take place in the neighborhood of phase singularities near the focus of a converging, spatially fully coherent polychromatic wave diffracted at an aperture. In particular, when the spectrum of the wave in the aperture consists of a single line with a narrow Gaussian profile, the spectrum near a phase singularity (i.e., near points of zero intensity of some particular spectral component) changes drastically along a closed loop around the singularity. The spectrum is redshifted at some points, blueshifted at others, and is split into two lines elsewhere.