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Plasmonic band gaps and trapped plasmons on nanostructured metal surfaces
T A Kelf1, Y Sugawara, J J Baumberg
1School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom. tkelf@phys.soton.ac.uk
Physical Review Letters
|October 4, 2005
Summary
Researchers created nanostructured metal surfaces with periodic spherical voids. These surfaces exhibit coupled plasmons, enabling optimization for diverse sensing applications through plasmon engineering.
Area of Science:
- Materials Science
- Nanotechnology
- Plasmonics
Background:
- Nanostructured metal surfaces with periodic voids are synthesized using electrochemical deposition.
- Understanding the behavior of plasmons in these structures is crucial for advanced applications.
Purpose of the Study:
- To investigate the plasmonic properties of nanostructured metal surfaces with periodically arranged spherical voids.
- To explore the coupling between different types of plasmons and their impact on dispersion properties.
- To demonstrate the potential for optimizing these materials for sensing applications.
Main Methods:
- Electrochemical deposition using a self-assembled template to grow nanostructured metal surfaces.
- Angle- and orientation-dependent reflectivity measurements to analyze spectral dispersion.
- Identification and characterization of delocalized Bragg and localized Mie plasmons.
Main Results:
- Observation of strong coupling between delocalized Bragg and localized Mie plasmons.
- Identification of bonding and antibonding mixed plasmons with anomalous dispersion.
- Demonstration that plasmon engineering of void morphology tunes plasmonic properties.
Conclusions:
- Nanostructured metal surfaces with periodic voids support coupled plasmon modes.
- Plasmon engineering offers a pathway to optimize these films for enhanced sensing performance.
- The findings open avenues for developing novel plasmonic sensors.