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Molecular-Induced Chirality Transfer to Plasmonic Lattice Modes
Eric Sidney Aaron Goerlitzer1, Mario Zapata-Herrera2, Ekaterina Ponomareva3
1Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany.
ACS Photonics
|June 26, 2023
Summary
This study demonstrates effective molecular chirality transfer to plasmonic lattice modes using gold nanoparticle arrays. This method offers a tunable way to control chirality in optical materials.
Area of Science:
- Plasmonics
- Chiroptical Spectroscopy
- Nanomaterials
Background:
- Molecular chirality is crucial in biological systems.
- Chirality manifests as a specific spectral response.
- Localized surface plasmon resonances (LSPRs) can transfer molecular chirality.
Purpose of the Study:
- To investigate chirality transfer to plasmonic lattice modes.
- To develop a tunable method for controlling chirality using plasmonic arrays.
Main Methods:
- Fabrication of non-close packed, periodic gold nanoparticle arrays via colloidal self-assembly.
- Embedding chiral molecules within a polymer film containing the nanoparticle arrays.
- Optical characterization and numerical simulations of the fabricated structures.
Main Results:
- Surface lattice resonances (SLRs) exhibited optical activity (handedness-dependent excitation) in the presence of chiral molecules.
- Circular dichroism peaks shifted with lattice modes, confirming chirality transfer.
- Simulations corroborated the spectral shifts and validated the chirality transfer mechanism.
Conclusions:
- Chirality can be effectively transferred to plasmonic lattice modes.
- This provides a tunable platform for controlling optical chirality.
- A semi-analytical model explains the coupling between molecular and plasmonic resonances for chirality transfer.
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