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Engineered nonlinear materials using gold nanoantenna array.

Vladimir P Drachev1,2, Alexander V Kildishev3, Joshua D Borneman3

  • 1Department of Physics and Advanced Materials & Manufacturing Institute, University of North Texas, Denton, Texas, 76203, USA. vladimir.drachev@unt.edu.

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Gold nanoantennas significantly boost nonlinear optical properties like nonlinear refractive index (n2) and two-photon absorption (2PA) in organic films. This enhancement enables precise engineering of the composite material

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Area of Science:

  • Plasmonics
  • Nonlinear Optics
  • Materials Science

Background:

  • Organic molecular films exhibit nonlinear optical properties.
  • Local electromagnetic fields can enhance molecular responses.
  • Gold nanoantennas are known for strong field localization.

Purpose of the Study:

  • To investigate the enhancement of nonlinear refractive index (n2) and two-photon absorption (2PA) in organic films using gold dipole nanoantennas.
  • To explore the role of local electromagnetic fields in boosting molecular nonlinearities.
  • To engineer the effective nonlinear response of the composite material.

Main Methods:

  • Embedding gold dipole nanoantennas within an organic molecular film (BDPAS).
  • Characterizing the nonlinear optical properties at 600 nm.
  • Analyzing the third-order susceptibility and its complex value.

Main Results:

  • Observed significant enhancements: 53× for 2PA and 140× for nonlinear refraction.
  • Achieved these enhancements with a low gold volume fraction (3.7%).
  • Demonstrated a sign change in n2 for the composite material due to complex susceptibility enhancement.

Conclusions:

  • Gold nanoantennas effectively enhance both 2PA and nonlinear refraction in organic films.
  • The complex nature of enhanced susceptibility allows for tuning the nonlinear response.
  • Tunable nanoantenna resonance offers a pathway for engineering composite nonlinear optical properties.