Giant circular dichroism of a molecule in a region of strong plasmon resonances between two neighboring gold nanocrystals

Abstract

We report on giant circular dichroism (CD) of a molecule inserted into a plasmonic hot spot. Naturally occurring molecules and biomolecules have typically CD signals in the UV range, whereas plasmonic nanocrystals exhibit strong plasmon resonances in the visible spectral interval. Therefore, excitations of chiral molecules and plasmon resonances are typically off-resonant. Nevertheless, we demonstrate theoretically that it is possible to create strongly-enhanced molecular CD utilizing the plasmons. This task is doubly challenging since it requires both creation and enhancement of the molecular CD in the visible region. We demonstrate this effect within the model which incorporates a chiral molecule and a plasmonic dimer. The associated mechanism of plasmonic CD comes from the Coulomb interaction which is greatly amplified in a plasmonic hot spot.

Manuscript: 4+pages, 4 figures; Supplemental_Material: 10 pages, 7 figures

References in corpus (4)

• DNA-based Self-Assembly of Chiral Plasmonic Nanostructures with Tailored Optical Response
• Semiconductor-metal nanoparticle molecules: hybrid excitons and non-linear Fano effect
• Chiral Surface Plasmon Polaritons on Metallic Nanowires
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• The Optical Chirality Flux as a Useful Far-Field Probe of Chiral Near Fields
• Long- and Short-Ranged Chiral Interactions in DNA Assembled Plasmonic Chains
• Quantitatively analyzing the mechanism of giant circular dichroism in extrinsic plasmonic chiral nanostructures by the interplay of electric and magnetic dipoles
• Amplification of Molecular Chiroptical Effect by Low-loss Dielectric Nanoantennas
• Surface Enhanced Circular Dichroism of Oriented Chiral Molecules by Plasmonic Nanostructures
• Chiral Discrimination in Helicity-Preserving Fabry-Pérot Cavities
• Giant chiroptical effect caused by the electric quadrupole
• Generalization of the circular dichroism from metallic arrays that support Bloch-like surface plasmon polaritons
• Enhanced sensing of molecular optical activity with plasmonic nanohole arrays
• Orientation Averaging of Optical Chirality Near Nanoparticles and Aggregates
• Classical Approaches to Chiral Polaritonics
• Competition of Chiroptical Effect Caused by Nanostructure and Chiral Molecules
• Plasmon-induced strong interaction between chiral molecules and orbital angular momentum of light