Dispersionless Phase Discontinuities for Controlling Light Propagation
Dispersionless Phase Discontinuities for Controlling Light Propagation
复制标题
用于控制光传播的无色散相位不连续性
DOI：
10.1021/nl303031j
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发表时间：
2012-11-01
期刊：
影响因子：
10.8
通讯作者：
Zhang, Shuang
中科院分区：
文献类型：
--
作者：
Huang, Lingling;Chen, Xianzhong;Zhang, Shuang
由单层亚波长等离子体共振器组成的超薄超颖表面能够产生局部突变相位变化，并且可以用于控制电磁波的波前。用于偏振与线性偏振（LP）入射波的偏振正交的透射或反射波分量。由于相移依赖于等离子体结构的共振特征，因此它通常依赖于波长。在这里，我们调查。圆偏振（CP）光在偶极天线阵列组成的界面处的相互作用，以产生空间变化的突变相位不连续性。相位不连续是无色散的，即它只取决于偶极天线的取向，而不取决于它们的光谱响应和入射光的波长。通过将天线排列成沿界面沿着具有恒定相位梯度的阵列，观察到了宽带反常折射现象。范围从可见光到近红外波长。我们更进一步。基于上述原理，设计并实验验证了一种用于产生宽带光学涡旋光束的双位相梯度界面。
Ultrathin metasurfaces consisting of a monolayer of subwavelength plasmonic resonators are capable of generating local abrupt phase changes and can be used for controlling the wavefront of electromagnetic waves The phase change occurs. for transmitted or reflected Wave components whose polarization is orthogonal to that of a linearly polarized (LP) incident wave. As the phase shift relies on the resonant features of the plasmonic structures, it is in general wavelength-dependent. Here, we investigate., the interaction of circularly polarized (CP) light at an interface composed of a dipole antenna array to create spatially varying abrupt phase discontinuities. The phase discontinuity is dispersionless that is, it solely depends on the orientation of dipole antennas, but not their spectral response and the wavelength of incident light By arranging the antennas in an array with a constant phase gradient along the interface, the phenomenon of broadband anomalous refraction,is Observed. ranging from visible to near infrared wavelengths. We further. design and experimentally demonstrate an ultrathin phase gradient interface to generate a broadband optical vortex beam based on the above, principle.