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Tunable three-dimensional helically stacked plasmonic layers on nanosphere monolayers
Yizhuo He1, George K Larsen, Whitney Ingram
1Department of Physics and Astronomy, and Nanoscale Science and Engineering Center, University of Georgia , Athens, Georgia 30602, United States.
Nano Letters
|March 21, 2014
Summary
Researchers developed a scalable method to create helical chiral plasmonic nanostructures. These structures show tunable chiroptical responses, paving the way for advanced chiral metamaterials and assemblies.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Chiral plasmonic nanostructures are crucial for advanced optical applications.
- Existing fabrication methods often lack scalability or precise control over chirality.
Purpose of the Study:
- To develop a simple, scalable method for fabricating helical chiral plasmonic nanostructures.
- To investigate the chiroptical properties and tunability of these nanostructures.
Main Methods:
- Utilizing glancing angle deposition on self-assembled nanosphere monolayers.
- Controlling substrate azimuthal rotation to achieve left-handed and right-handed helical stacking of silver (Ag) and silicon dioxide (SiO2) layers.
- Employing finite-difference time-domain (FDTD) simulations to analyze optical responses.
Main Results:
- Successfully fabricated continuous helical plasmonic nanostructures with controlled handedness.
- Observed strong chiroptical responses in the visible to near-infrared (near-IR) spectral region.
- Demonstrated tunability of chiroptical properties by altering nanosphere diameter.
Conclusions:
- The developed method offers a flexible and scalable route to chiral plasmonic metamaterials.
- These helical nanostructures show potential as building blocks for chiral assemblies and tunable optical devices.
