Dr. Shengnan Tian Profile

Dr. Shengnan Tian

at Univ of Shanghai For Science And Technology

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Proceedings Article | 30 January 2019 Paper

Dual-polarity dielectric cylindrical lens and spherical lens for visible light

Shengnan Tian, Hanming Guo, Jinbing Hu

Proceedings Volume 10841, 1084109 (2019) https://doi.org/10.1117/12.2506243

KEYWORDS: Lenses, Phase modulation, Metamaterials, Dielectrics, Visible radiation

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In this paper, we propose a dielectric cylindrical lens and a dielectric spherical lens with dual polarity operating at visible frequencies. Composed of an array of nanofins with high aspect ratio as phase shifting elements, the designed dielectric dual-polarity lens have higher scattering efficiency and polarization conversion power than plasmonic dualpolarity lens. The phase variation from 0 to 2π is determined by adjusting the orientation angle of the individual nanofins according to the PB phase. By controlling the helicity of the incident circularly polarized light, the positive and negative polarity are interchangeable in one designed metalens. We demonstrate the broadband metalens possess a wavelength controllable focal length with incident wavelength from 488 to 740 nm. The dielectric dual-polarity metalens may open a new avenue for advanced research and applications in focusing and imaging devices, angular-momentum-based quantum information processing and integrated nano-optoelectronics.

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