Diffraction control of subwavelength structured light beams in Kapitza media
Diffraction control of subwavelength structured light beams in Kapitza media
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DOI：
10.1364/oe.23.012692
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发表时间：
2015-05-18
期刊：
影响因子：
3.8
通讯作者：
Chen, Xianfeng
中科院分区：
文献类型：
--
作者：
Huang, Changming;Ye, Fangwei;Chen, Xianfeng
Kapitza串联结构，由具有相反符号的介电常数的薄交替层组成，最近已经预测提供聚焦微波辐射的衍射逮捕[Phys.Rev.Lett. 110，143901（2013）]。在这里，我们研究的适用性的Kapitza效应来控制结构的亚波长光束的传播。我们表明，足够深的介电常数的调制允许一个几乎完全的多峰亚波长光束的衍射抵消，我们研究了衍射抵消的程度如何随着输入光束的空间光谱的加宽而降低。我们还发现，亚波长光束可以通过改变介电常数调制的深度来控制。特别是，一个足够大的介电常数调制显示，否则标题输入传播总是沿着调制的方向。(C)2015年美国光学学会
Kapitza tandem structures, consisting of thin alternating layers with opposite signs of the dielectric permittivity, have been recently predicted to afford diffraction arrest of focused microwave radiation [Phys. Rev. Lett. 110, 143901 (2013)]. Here we study the applicability of the Kapitza effect to control the propagation of structured subwavelength light beams. We show that a sufficiently deep modulation of the dielectric permittivity allows a nearly complete diffraction cancellation of multiple-peak subwavelength beams, and we study how the degree of diffraction cancellation decreases as the spatial spectrum of the input beam broadens. We also find that subwavelength light beams can be steered by varying the depth of the permittivity modulation. In particular, a sufficiently large permittivity modulation is shown to cause otherwise titled inputs to propagate always along the direction of modulation. (C) 2015 Optical Society of America