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Imaging through Nonlinear Metalens Using Second Harmonic Generation.

Christian Schlickriede1, Naomi Waterman2, Bernhard Reineke1

  • 1Department of Physics, University of Paderborn, Warburger Straße 100, D-33098, Paderborn, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|January 10, 2018
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated nonlinear metalenses for infrared imaging with visible light output. These ultrathin devices enable frequency conversion and tunable image formation, opening new avenues for optoelectronic devices.

Keywords:
Pancharatnam-Berry phasemetalensesmetasurfacesnonlinear imagingsecond harmonic generation

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Area of Science:

  • Metasurfaces and Nanophotonics
  • Nonlinear Optics
  • Optical Imaging

Background:

  • Metasurfaces offer precise light manipulation via abrupt phase changes, enabling miniaturized and aberration-corrected planar metalenses for imaging.
  • Integrating nonlinear optical responses into metasurfaces expands their functionality beyond linear imaging.

Purpose of the Study:

  • To demonstrate imaging with nonlinear metalenses capable of simultaneous frequency conversion.
  • To explore the modulation of nonlinear optical responses and image formation (real/virtual) by controlling light polarization.

Main Methods:

  • Fabrication of ultrathin nonlinear metalenses.
  • Experimental demonstration of imaging near-infrared (NIR) objects with a visible second-harmonic (SH) image.
  • Modulation of image properties by switching the handedness of circularly polarized incident light.

Main Results:

  • Successful imaging of NIR objects, with the image generated in the visible spectrum via second-harmonic generation.
  • Demonstrated tunable image formation (real or virtual) by altering the polarization handedness of the fundamental wave.
  • Showcased the ability to modulate nonlinear optical responses independently of the fundamental wave.

Conclusions:

  • Nonlinear metalenses enable infrared imaging using visible detectors and offer novel capabilities for nonlinear optical signal processing.
  • These devices represent a significant advancement in ultrathin optical components for advanced imaging and information processing applications.