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Generation of equal-intensity coherent optical beams by binary geometrical phase on metasurface

2016; American Institute of Physics; Volume: 108; Issue: 26 Linguagem: Inglês

10.1063/1.4955034

1520-8842

Zheng-Han Wang, Shang‐Chi Jiang, Xiang Xiong, Ru‐Wen Peng, Mu Wang,

Plasmonic and Surface Plasmon Research

We report here the design and realization of a broadband, equal-intensity optical beam splitter with a dispersion-free binary geometric phase on a metasurface with unit cell consisting of two mirror-symmetric elements. We demonstrate experimentally that two identical beams can be efficiently generated with incidence of any polarization. The efficiency of the device reaches 80% at 1120 nm and keeps larger than 70% in the range of 1000–1400 nm. We suggest that this approach for generating identical, coherent beams have wide applications in diffraction optics and in entangled photon light source for quantum communication.