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Mechanochromic Reconfigurable Metasurfaces.

Artemios Karvounis1,2, Nikolaos Aspiotis1, Ioannis Zeimpekis1

  • 1Optoelectronics Research Centre University of Southampton Southampton SO17 1BJ UK.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 16, 2019
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Summary
This summary is machine-generated.

Researchers developed a new artificial metasurface that changes color when deformed, showing a giant mechanochromic effect. This smart material offers potential for advanced photonic devices and stress sensors.

Keywords:
mechanochromismmetasurfacesnanomechanicsphotonic metamaterialsvan der Waals materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Mechanochromism describes optical property changes in materials under stress.
  • Natural compounds and polymers typically exhibit mechanochromism.
  • Artificial materials offer new possibilities for mechanochromic applications.

Purpose of the Study:

  • To create and characterize an artificial nanomechanical metasurface with mechanochromic properties.
  • To investigate the optical response of the metasurface to mechanical deformation.
  • To explore the potential of such metasurfaces for advanced photonic applications.

Main Methods:

  • Fabrication of a subwavelength nanowire array metasurface using molybdenum disulfide, molybdenum oxide, and silicon nitride.
  • Mechanical deformation of the metasurface to induce changes in optical properties.
  • Measurement of optical transmission changes at specific wavelengths.

Main Results:

  • The artificial metasurface exhibited a giant mechanochromic effect with a 197% relative transmission change at 654 nm upon deformation.
  • The metasurface demonstrated reversible changes in optical transmission.
  • Two nonvolatile states with a 45% optical transmission difference at 678 nm were achieved upon rapid bending.

Conclusions:

  • Photonic nanomechanical metasurfaces offer wide optical tunability for mechanochromic and bistable responses.
  • These metasurfaces represent a new class of smart materials.
  • Potential applications include reconfigurable photonic filters, switches, and stress sensors.