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Catenary Nanostructures as Compact Bessel Beam Generators

Title: Catenary nanostructures as compact Bessel beam generators
Author(s): Li, X (Li, Xiong); Pu, MB (Pu, Mingbo); Zhao, ZY (Zhao, Zeyu); Ma, XL (Ma, Xiaoliang); Jin, JJ (Jin, Jinjin); Wang, YQ (Wang, Yanqin); Gao, P (Gao, Ping); Luo, XG (Luo, Xiangang)
Source: SCIENTIFIC REPORTS  Volume: 6  Article Number: 20524  DOI: 10.1038/srep20524  Published: FEB 4 2016 
Abstract: Non-diffracting Bessel beams, including zero-order and high-order Bessel Beams which carry orbital angular momentum (OAM), enable a variety of important applications in optical micromanipulation, sub-diffraction imaging, high speed photonics/quantum communication, etc. The commonly used ways to create Bessel beams, including an axicon or a digital hologram written to a spatial light modulator (SLM), have great challenges to operate at the nanoscale. Here we theoretically design and experimentally demonstrate one kind of planar Bessel beam generators based on metasurfaces with analytical structures perforated in ultra-thin metallic screens. Continuous phase modulation between 0 to 2 pi is realized with a single element. In addition, due to the dispersionless phase shift stemming from spin-orbit interaction, the proposed device can work in a wide wavelength range. The results may find applications in future optical communication, nanofabrication and super-resolution imaging, etc.
Accession Number: WOS:000369287100001
IDS Number: DC5UX
ISSN: 2045-2322

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