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Fabricating Metamaterials Using the Fiber Drawing Method
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Electronic Metamaterials with Tunable Second-order Optical Nonlinearities.

Hung-Hsi Lin1, Felipe Vallini2, Mu-Han Yang2

  • 1Materials Science and Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, California, 92093, USA.

Scientific Reports
|September 1, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel asymmetric metal-semiconductor-metal metamaterial. This material offers a large, electronically tunable second-order optical susceptibility (χ(2)) for advanced nonlinear optics applications.

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Area of Science:

  • Nonlinear Optics
  • Metamaterials Science
  • Condensed Matter Physics

Background:

  • Metamaterials engineering is key for tunable nonlinear optical properties.
  • Metals traditionally enhance nonlinear optical interactions via field localization.
  • Achieving tunable second-order nonlinear optical effects (χ(2)) in metamaterials remains a challenge.

Purpose of the Study:

  • To introduce and experimentally demonstrate an asymmetric metal-semiconductor-metal (MSM) metamaterial.
  • To achieve a large and electronically tunable effective second-order optical susceptibility (χ(2)).
  • To explore applications in all-optical spatial signal processing.

Main Methods:

  • Fabrication of an asymmetric metal-semiconductor-metal (MSM) metamaterial structure.
  • Utilizing dissimilar metal work functions to engineer internal electric fields at interfaces.
  • Investigating the interaction between semiconductor third-order susceptibility (χ(3)) and engineered fields.
  • Demonstrating tunable nonlinear diffraction through spatial patterning.

Main Results:

  • The MSM metamaterial exhibits a large and electronically tunable effective second-order optical susceptibility (χ(2)).
  • Achieved a fivefold increase in second-harmonic intensity compared to constituent materials.
  • Demonstrated an electrically tunable nonlinear coefficient ranging from 2.8 to 15.6 pm/V.
  • Showcased tunable nonlinear diffraction with spatial patterning.

Conclusions:

  • The developed MSM metamaterial offers a novel pathway for generating tunable nonlinear optical responses.
  • This technology enables significant enhancements in second-harmonic generation.
  • The findings pave the way for advanced all-optical spatial signal processing applications.