4.6 Article

Polarization-independent metalens constructed of antennas without rotational invariance

期刊

OPTICS LETTERS
卷 42, 期 19, 页码 3996-3999

出版社

OPTICAL SOC AMER
DOI: 10.1364/OL.42.003996

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资金

  1. Ministry of Science and Technology of the People's Republic of China (MOST) [2013CB632705, 2017YFA0205801]
  2. National Natural Science Foundation of China (NSFC) [11334008, 61290301, 61521005, 61705249]
  3. Fund of Shanghai Science and Technology Foundation [16JC1400400, 16JC1400404, 16ZR1445300]
  4. Shanghai Sailing Program [16YF1413200]
  5. Youth Innovation Promotion Association of the Chinese Academy of Sciences [2017285]
  6. Key Research Project of Frontier Science of CAS [QYZDJ-SSW-JSC007]

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We propose a novel approach to designing an ultrathin polarization-independent metalens (PIM) by utilizing antennas without rotational invariance. Two arrays of nanoblocks are elaborately designed to form the super cell of the PIM, which are capable of focusing right-handed circularly polarized and left-handed circularly polarized lights. With such a strategy, the PIM is able to achieve polarization-independent focusing, since the light with any polarization can be treated as a combination of the two orthogonal ones. A theoretical analysis based on the Jones vector is proposed to detailedly explore the underlying physics. The polarization-independent characteristic of the designed PIM is also demonstrated by utilizing finite difference time domain simulations. Moreover, polarization-independent focusing can be achieved within a wavelength range of 400 nm. These results can deepen our understanding of polarization-independent focusing and provide a new method for designing ultrathin polarization-independent devices. (C) 2017 Optical Society of America

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