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A Discrete Interaction Model/Quantum Mechanical Method for Simulating Plasmon-Enhanced Two-Photon Absorption.

Zhongwei Hu1, Lasse Jensen1

  • 1Department of Chemistry , The Pennsylvania State University , 104 Chemistry Building , University Park , Pennsylvania 16802 , United States.

Journal of Chemical Theory and Computation
|October 24, 2018
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Summary
This summary is machine-generated.

We developed a new method to simulate plasmon-enhanced two-photon absorption (PETPA) in molecules near nanoparticles. This approach reveals complex interactions beyond simple field enhancement, enabling new insights into nonlinear optical properties.

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Area of Science:

  • Computational chemistry
  • Plasmonics
  • Nonlinear optics

Background:

  • Plasmon-enhanced spectroscopy offers new ways to study molecular properties.
  • Understanding molecule-nanoparticle interactions is key to controlling optical responses.

Purpose of the Study:

  • To extend the discrete interaction model/quantum mechanical (DIM/QM) method for simulating plasmon-enhanced two-photon absorption (PETPA).
  • To investigate the effects of local fields, molecular orientation, and distance on PETPA.
  • To explore the coupling between molecular excitations and plasmon resonances.

Main Methods:

  • Utilized the discrete interaction model/quantum mechanical (DIM/QM) method.
  • Treated metal nanoparticles atomistically with electrodynamics.
  • Described molecules using damped cubic response theory within time-dependent density functional theory (TD-DFT).

Main Results:

  • PETPA enhancement is more complex than the simple |E|⁴ mechanism.
  • A two-photon absorption (TPA) dark state in para-nitroaniline (p-NA) was significantly enhanced via plasmon coupling.
  • Observed complex nonlinear spectroscopic behavior arising from coupled molecular and plasmonic excitations.

Conclusions:

  • The DIM/QM method provides detailed insights into enhanced nonlinear optical properties.
  • Molecule-plasmon coupling leads to complex and unusual behaviors in spectroscopy.
  • This work advances the understanding of plasmon-enhanced molecular spectroscopy.