Nonlinear Metasurface for Simultaneous Control of Spin and Orbital Angular Momentum in Second Harmonic Generation

Guixin LI*, Lin Wu, King F. Li, Shumei Chen, Christian Schlickriede, Zhengji Xu, Siya Huang, Wendi Li, Yanjun Liu, Edwin Y.B. Pun, Thomas Zentgraf, Kok Wai CHEAH, Yu Luo, Shuang Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)

Abstract

The spin and orbital angular momentum (SAM and OAM) of light is providing a new gateway toward high capacity and robust optical communications. While the generation of light with angular momentum is well studied in linear optics, its further integration into nonlinear optical devices will open new avenues for increasing the capacity of optical communications through additional information channels at new frequencies. However, it has been challenging to manipulate the both SAM and OAM of nonlinear signals in harmonic generation processes with conventional nonlinear materials. Here, we report the generation of spin-controlled OAM of light in harmonic generations by using ultrathin photonic metasurfaces. The spin manipulation of OAM mode of harmonic waves is experimentally verified by using second harmonic generation (SHG) from gold meta-atom with 3-fold rotational symmetry. By introducing nonlinear phase singularity into the metasurface devices, we successfully generate and measure the topological charges of spin-controlled OAM mode of SHG through an on-chip metasurface interferometer. The nonlinear photonic metasurface proposed in this work not only opens new avenues for manipulating the OAM of nonlinear optical signals but also benefits the understanding of the nonlinear spin-orbit interaction of light in nanoscale devices.

Original languageEnglish
Pages (from-to)7974-7979
Number of pages6
JournalNano Letters
Volume17
Issue number12
DOIs
Publication statusPublished - 13 Dec 2017

Scopus Subject Areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

User-Defined Keywords

  • Metasurface
  • optical vortex
  • orbital angular momentum
  • plasmonics
  • second harmonic generation
  • spin angular momentum

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