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Atomic Layer Deposition for Enhanced Light Confinement in Nonlinear Metasurfaces.

Viktoriia E Babicheva1, Chun-Chieh Chang2

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This summary is machine-generated.

This study enhances nonlinear metasurfaces using titania coatings applied via atomic layer deposition (ALD). This method boosts light confinement and nonlinear signal generation, particularly for telecommunication wavelengths.

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Area of Science:

  • Nanophotonics and Metasurface Engineering
  • Nonlinear Optics
  • Materials Science

Background:

  • Metasurfaces offer strong nonlinear optical responses through nanoantenna resonances.
  • Conventional nonlinear materials have moderate refractive indices, limiting mode localization.
  • High-refractive-index materials enhance mode confinement but often require high-temperature processing.

Purpose of the Study:

  • To enhance mode confinement in nonlinear metasurfaces.
  • To develop a low-temperature atomic layer deposition (ALD) process for conformal titania coatings.
  • To improve nonlinear signal generation in the near-infrared (NIR) wavelength range.

Main Methods:

  • Development of a low-temperature ALD process for titania conformal coatings.
  • Design of a metasurface integrating a nonlinear crystal with an ALD titania coating.
  • Numerical simulations to optimize ALD coating thickness for enhanced mode localization and nonlinear effects.

Main Results:

  • Achieved enhanced mode confinement in nonlinear metasurfaces using titania ALD coatings.
  • Demonstrated significant enhancement in second-harmonic generation (SHG) through optimized ALD thickness.
  • Validated the low-temperature ALD process for materials sensitive to high temperatures, including polymers.

Conclusions:

  • Conformal titania ALD coatings effectively enhance mode confinement and nonlinear optical responses in metasurfaces.
  • The developed low-temperature ALD technique broadens the applicability of metasurface nonlinearities to a wider range of materials.
  • Optimized metasurface designs show promise for efficient nonlinear signal generation in the telecommunication wavelength range.