Compared to conventional devices, metasurface offer the advantages of lightweight, planarization and tuning flexibility. It provides a new way to integrate and miniaturize optical systems. In this paper, a metasurface capable of generating multiple bottle beams was designed. Based on the Pancharatnam–Berry (P-B) phase principle, the metasurface lens can accurately control the wavefront by adjusting the aspect ratio of the titanium dioxide nanopillars and the rotation angle. When irradiated by left-handed circularly polarized light with a wavelength of 632.8 nm, the optical system can produce multiple micron bottle beams. Taking two bottle beams as examples, the longitudinal full width at half-maximum of the optical tweezers can reach 0.85 and 1.12 microns respectively, and the transverse full width at half-maximum can reach 0.46 and 0.6 microns. And the number of generated bottle beams can be varied by controlling the size of the annular obstacle. By changing the x-component of the unit rotation angle, the metasurface can also change the shape of the bottle beam-the beam cross-section can be changed from circular to elliptical. This paper also analyzes the trapping of ytterbium atoms by the multi bottle beam as optical tweezers. It is found that the multi bottle beam can cool and trap multiple ytterbium atoms.
Two d
10 metal coordination polymers, [Zn(CMTB)(bipy)] · (H2O)2 (1) and [Cd(CMTB)(bipy)] · (H2O)1.25 (2) (CMTB = 4-[(carboxymethyl) thio]-benzoic acid, bipy = 2,2′-bipyridine) were synthesized under mild mixed solvothermal conditions and characterized by single crystal X-ray diffraction and IR spectroscopy. Compound 1 crystallizes in monoclinic system, space group P21/n with cell parameters: a = 8.1083(16) Å, b = 17.194(3) Å, c = 28.646(6) Å, β = 97.96(3)˚ and Z = 8. It contains a one-dimensional (1D) chain structure that is further assembled into a two-dimensional (2D) network by the co-effects of the inter-chain C—H ··· O hydrogen bonds. Each Zn(II) is six-coordinated to four O atoms from two CMTB ligands, and two N atoms from the 2,2′-bipyridine forming a distorted octahedral coordination geometry. Compound 2 crystallizes in monoclinic system, space group P2/c with cell parameters: a = 19.656(4) Å, b = 10.716(2) Å, c = 19.455(4) Å, β = 94.10(3) and Z = 8. It displays two-dimensional framework and metal ion Cd(II) is octahedrally coordinated to four O atoms and two N atoms. Both Compound 1 and 2 are photoluminescent active and their emission properties were also studied.
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