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Surface plasmon resonance in two-dimensional nanobottle arrays
1Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
Optics Express
|July 9, 2008
Summary
Researchers manipulated surface plasmon polaritons using nanobottle arrays on gold surfaces. Tuning nanobottle geometry controls plasmon resonances, enabling independent excitation of propagating and localized surface plasmon polaritons for plasmonic devices.
Area of Science:
- Nanophotonics and Plasmonics
- Materials Science
Background:
- Surface plasmon polaritons (SPPs) are electromagnetic waves propagating at the interface between a conductor and a dielectric.
- Controlling SPPs is crucial for developing advanced optical devices and nanophotonic circuits.
- Subwavelength structures offer a promising route for manipulating SPPs at the nanoscale.
Purpose of the Study:
- To investigate the manipulation of surface plasmon polaritons using two-dimensional arrays of subwavelength bottle-shaped cavities (nanobottles) on a gold surface.
- To explore how the geometry of nanobottles influences resonant frequencies and near-field patterns of surface plasmon resonances.
- To demonstrate the independent excitation of different types of plasmonic resonances (propagating and localized) by controlling polarization.
Main Methods:
- Fabrication of two-dimensional arrays of subwavelength bottle-shaped cavities on a gold surface.
- Numerical simulations and experimental measurements of surface plasmon polaritons.
- Analysis of plasmonic band structures and near-field patterns.
- Tuning of nanobottle geometry and polarization of incident light.
Main Results:
- Nanobottle geometry allows precise control over resonant frequencies and near-field patterns of surface plasmon resonances.
- Plasmonic band structures are insensitive to nanobottle size and depth but strongly dependent on polarization.
- Independent excitation of propagating and localized plasmonic resonances is achieved by varying polarization.
- Local field and field intensity can be fine-tuned by controlling the bottleneck topology of the nanobottles.
Conclusions:
- Nanobottle arrays provide an effective platform for manipulating surface plasmon polaritons.
- The ability to independently control different plasmonic resonances opens possibilities for novel plasmonic devices.
- These findings suggest potential applications in areas such as optical sensing, data storage, and metamaterials.
