Imaging through Nonlinear Metalens Using Second Harmonic Generation

Research output: Contribution to journalArticlepeer-review

Authors

  • Christian Schlickriede
  • Naomi Waterman
  • Bernhard Reineke
  • Philip Georgi
  • Thomas Zentgraf

Colleges, School and Institutes

External organisations

  • Department of Physics, University of Paderborn

Abstract

The abrupt phase change of light at metasurfaces provides high flexibility in wave manipulation without the need for accumulation of propagating phase through dispersive materials. In the linear optical regime, one important application field of metasurfaces is imaging by planar metalenses, which enables device miniaturization and aberration correction compared to conventional optical microlens systems. With the incorporation of nonlinear responses into passive metasurfaces, optical functionalities of metalenses are anticipated to be further enriched, leading to completely new application areas. Here, imaging with nonlinear metalenses that combine the function of an ultrathin planar lens with simultaneous frequency conversion is demonstrated. With such nonlinear metalenses, imaging of objects with near infrared light while the image appears in the second harmonic signal of visible frequency range is experimentally demonstrated. Furthermore, the functionality of these nonlinear metalenses can be modified by switching the handedness of the circularly polarized fundamental wave, leading to either real or virtual nonlinear image formation. Nonlinear metalenses not only enable infrared light imaging through a visible detector but also have the ability to modulate nonlinear optical responses through an ultrathin metasurface device while the fundamental wave remains unaffected, which offers the capability of nonlinear information processing with novel optoelectronic devices.

Details

Original languageEnglish
Article number1703843
Pages (from-to)1-7
JournalAdvanced Materials
Volume30
Issue number8
Publication statusPublished - 8 Jan 2018

Keywords

  • metalenses , metasurfaces , nonlinear imaging , pancharatnam-berry phase , second harmonic generation