3D Meta‐Prisms for Versatile Beam Steering by Hybridizing Plasmonic and Diffractive Effect in the Broadband Visible Regime. Issue 34 (20th July 2021)

• Record Type: Journal Article
• Authors: Wan, Chengwei; Dai, Chenjie; Zhang, Jian; Wan, Shuai; Li, Zile; Zheng, Guoxing; Zhang, Xuefeng; Li, Zhongyang
• Is Part Of: Small. Volume 17:Issue 34(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-20
• Subjects: all‐metallic 3D meta‐prism -- blazed grating -- broadband visible light -- metasurfaces -- wide beam splitting; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202100561
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: As two independent optical sub‐fields, diffraction optics and plasmonics both have been used for wavefront shaping and beam steering. However, the two separate concepts have always been developing as two parallel directions, which have not met for studying their structural hybridization to discover new potentials. For instance of the flat metasurfaces, even though the geometric parameters including shape, size, and periodicity have been studied, it remains mostly unexplored for the 3D spatial height variation. Here, a new type of all‐metallic 3D meta‐prism is proposed and experimentally demonstrated by hybridizing the localized surface plasmonic resonances (LSPR) and the blazed grating diffraction, which enables strong polarization‐dependent behaviors to steer broadband visible light to drastically inverse directions. The nanofabrication of 3D meta‐prism is achieved by nanostencil lithography with electron‐beam evaporation. Such meta‐prism could also enable to split different visible light (green, blue, and red) with high‐efficiency contrast (≈10). By the mirror‐symmetry arrangement, a multifunctional surface is demonstrated with polarization‐/wavelength‐multiplexing wavefront‐shaping functions (concave, convex, or flat mirror). This unique 3D meta‐prism enjoys great simplicity and versatility in broadband beam steering through the incorporation of plasmonic and diffractive effects and can be utilized in various applications including dichroic‐prism splitters, multifunctional meta‐mirrors, etc. Abstract : A unique all‐metallic 3D meta‐prism design with both width and height variations is proposed and experimentally demonstrated. Through hybridizing the localized surface plasmonic resonances and the blazed grating diffraction, it enables polarization‐multiplexing or wavelength‐multiplexing beam‐steering functionalities. By mirror‐symmetry arrangement, a multifunctional surface is also demonstrated to exhibit alternatively as a concave/convex/flat mirror.