Emission of orbital angular momentum based on spoof localized surface plasmons

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Youfei ZHANG
  • Erping LI
  • Jianming JIN
  • Haogang WANG

Detail(s)

Original languageEnglish
Pages (from-to)5735-5738
Journal / PublicationOptics Letters
Volume44
Issue number23
Online published25 Nov 2019
Publication statusPublished - 1 Dec 2019

Abstract

An approach to producing the orbital angular momentum (OAM) based on spoof localized surface plasmons (spoof LSPs) in microwave frequencies is demonstrated both theoretically and experimentally. The fundamental and high-order modes of spoof LSPs occur when a textured metallic surface is excited with a microstrip line. Two orthogonal modes of spoof LSPs with +90° or −90° phase retardation are superimposed, resulting in a OAM-vortex mode. In the proposed design, two separate feeding ports are employed to excite the orthogonal resonant modes simultaneously, and a hybrid coupler is used to provide the required ±90° phase retardation. By loading a circularly arranged dipole array on the spoof LSPs, the confined surface waves of the spoof LSPs can be converted into radiated vortex waves. To verify this idea, an OAM-mode emitter with indices of ±3 is fabricated and measured. Experimental near-field distributions and far-field radiation patterns show excellent agreement with the simulated results.

Research Area(s)

  • BROAD-BAND, METASURFACE, CONVERSION, BEAM

Citation Format(s)

Emission of orbital angular momentum based on spoof localized surface plasmons. / ZHANG, Youfei; ZHANG, Qingle; CHAN, Chi Hou et al.

In: Optics Letters, Vol. 44, No. 23, 01.12.2019, p. 5735-5738.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review