All‐Fiber Optical Waveform Converter Based on Deformed Catenary Nanostructure

Abstract

Herein, an optical waveform converter is presented by using a deformed catenary nanostructure at a double‐cladding fiber end. A vortex beam and Gaussian beam can be generated by wavelength modulation of the helical optical fiber grating fabricated in the double‐cladding fiber. Through the circular polarization modulation of the deformed catenary nanostructure, the generated beams can realize further various waveform conversions, forming several special beams with unique optical focusing, divergence, and rotation capabilities. Taking advantage of the combination of optical fiber integration and metasurface technologies, the device has broad application prospects in biomedicine, optical communication, optical manipulation, and optical imaging.

Fiber end integrated surface plasma lens for circular airy beam shaping

“…Under this background, integrating surface plasma lens onto fiber end is highly expected to provide powerful fiber light field control ability, which has attracted extensive attention recently. For example, Zhang et al used a deformed catenary nanostructure at the end of a double-clad fiber to realize all-fiber optical waveform converter [30], Luo et al designed fiber-integrated catenary ring-array metasurfaces for Bessel-like nondiffracting beam generation [31], and Guan et al demonstrated a compact fiber integrated plasma lens for Airy-like beam generation [32]. However, to the best of our knowledge, no studies have been reported on the generation of circular airy beam by using fiber end integrated surface plasma lens.…”