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Circular Dichroism in Off-Resonantly Coupled Plasmonic Nanosystems
Vivian E Ferry1, Mario Hentschel2, A Paul Alivisatos2,3,4,5
1Department of Chemical Engineering and Materials Science, University of Minnesota-Twin Cities , 421 Washington Ave SE, Minneapolis, Minnesota 55455, United States.
Nano Letters
|November 17, 2015
Summary
Chiral plasmonic systems show strong chiroptical responses. This study reveals that even weak, off-resonant coupling between chiral nanostructures can generate a chiroptical response, offering new ways to control light-matter interactions.
Area of Science:
- Plasmonics
- Chiroptics
- Nanophotonics
Background:
- Chiral plasmonic systems exhibit significantly larger chiroptical responses compared to molecular or solid-state systems.
- The necessity of collective plasmonic modes for chiroptical response in chiral assemblies remains an open question.
Purpose of the Study:
- To investigate the role of resonant coupling in chiral plasmonic systems.
- To determine if collective plasmonic modes are essential for chiroptical response in chiral nanostructure assemblies.
Main Methods:
- Experimental investigation of chiral plasmonic systems.
- Computational simulations to model plasmonic behavior.
- Analysis of scattering between individual nanostructures.
Main Results:
- Off-resonant coupling between spectrally detuned, structurally chiral nanostructures produces a discernible, albeit weak, chiroptical response.
- The observed chiroptical response can be explained by scattering interactions between individual nanostructure constituents.
- Collective plasmonic modes are not strictly necessary for a chiroptical response.
Conclusions:
- Chiroptical responses in plasmonic systems can be achieved through off-resonant coupling mechanisms.
- Understanding scattering interactions provides a framework for interpreting chiroptical phenomena in chiral nanostructures.
- These findings enable enhanced control and tuning of chiroptical responses for tailored chiral light-matter interactions.
