Deep-ultraviolet to mid-infrared polarizers by Al nanowire metamaterials


Polarizers are one of the most fundamental elements used in optical devices. Compared with conventional prism polarizers, wire grid polarizers have potential for the miniaturization and integration of the optical devices. There are growing demands for design of the wire grid polarizers operating in a very broad spectral range from deep-ultraviolet to mid-infrared wavelengths. However, construction of the ultrabroadband polarizers based on the same structures and materials is very challenging. Here, ultrabroadband optical polarizers working in the deep-ultraviolet to mid-infrared spectral region, based on Al nanowire metamaterials with hexagonally packed nanowire arrays, are presented. To synchronously obtain high extinction ratios and low insertion losses, a q factor is found, when the q factor is fixed, the extinction ratio increases and the insertion loss simultaneously decreases with decreasing nanowire diameter. Moreover, the cut-off wavelength of the polarizers remarkably shifts to a much shorter wavelength when the refractive index of the surrounding medium decreases. Consequently, the polarizers demonstrate high performance operating down to the deep-ultraviolet spectral range based on an optimal design of the Al nanowire metamaterials embedded in air by selecting a smaller diameter (e.g. 15 nm) and a suitable q factor (e.g. 2 or 2.5).

Publication DOI:
Divisions: Engineering & Applied Sciences > Aston Institute of Photonics Technology
Engineering & Applied Sciences
Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Additional Information: As the Version of Record of this article is going to be/has been published on a subscription basis, this Accepted Manuscript will be available for reuse under a CC BY-NC-ND 3.0 licence after a 12 month embargo period. Funding: National Natural Science Foundation of China (51771186, 11574070, 11874012); The Fundamental Research Funds for the Central Universities (PA2018GDQT0006, JZ2017HGTB0187, JZ2017HGBZ0942); The Seventh Framework Program of the European Union for Research through Marie Curie Actions-International Incoming Fellowships (623473, 913473); Program 973 (2015GB103003); The Project of State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology (17FKSY0109); China Postdoctoral Science Foundation (2015M571918, 2017T100442); The European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement (744817).
Uncontrolled Keywords: Al nanowire metamaterial,cut-off wavelength,deep ultraviolet to mid-infrared spectral region,q factor,ultrabroadband polarizer,Electronic, Optical and Magnetic Materials,Condensed Matter Physics,Acoustics and Ultrasonics,Surfaces, Coatings and Films
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Related URLs: https://iopscie ... 361-6463/ab28c9 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2019-07-08
Published Online Date: 2019-06-11
Accepted Date: 2019-06-10
Authors: Zhang, Junxi
Xie, Kang
Wei, Yongqing
Wang, Pei
Hu, Zhijia ( 0000-0002-8960-5318)
Wang, Haoyu
Wang, Fei
Liang, Taiming
Ghafoor, Sonia
Jiang, Haiming
Zhang, Li De
Zhang, Lin ( 0000-0002-1691-5577)

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