Zhou Shaodong, Xi Kelei, Zhuang Songlin, Cheng Qingqing
Shanghai Key Laboratory of Modern Optical System, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Hong Kong, China.
Nanomaterials (Basel). 2021 Oct 20;11(11):2774. doi: 10.3390/nano11112774.
We present a terahertz spherical aberration-corrected metalens that uses the dynamic phase to achieve polarization multiplexed imaging. The designed metalens has polarization-dependent imaging efficiencies and polarization extinction ratios that exceed 50% and 10:1, respectively. Furthermore, opposite gradient phases can be applied to orthogonal polarizations to shift the imaging of the two polarized sources in the longitudinal and transverse directions. Indeed, we find that the metalens has a smaller depth-of-focus than a traditional metalens when imaging point sources with limited objective lengths. These results provide a new approach for achieving multifunctional beam steering, tomographic imaging and chiroptical detection.
我们展示了一种太赫兹球面像差校正超表面透镜，它利用动态相位实现偏振复用成像。所设计的超表面透镜具有偏振相关的成像效率和偏振消光比，分别超过50%和10:1。此外，相反的梯度相位可应用于正交偏振，以在纵向和横向方向上移动两个偏振源的成像。实际上，我们发现当对具有有限物距的点源进行成像时，该超表面透镜的焦深比传统超表面透镜更小。这些结果为实现多功能光束控制、层析成像和手性光学检测提供了一种新方法。
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