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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
Published on: September 5, 2017
Dispersion control in plasmonic open nanocavities.
Xinli Zhu1, Jiasen Zhang, Jun Xu
1State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People's Republic of China.
ACS Nano
|July 14, 2011
Summary
Researchers explored how open circular cylinder nanocavity height affects plasmonic properties. This work offers a new method for controlling surface plasmon polariton dispersion, enabling applications in nanolasers and light-emitting devices.
Area of Science:
- Nanophotonics and Plasmonics
- Optical Cavity Physics
- Materials Science
Background:
- Surface plasmon polaritons (SPPs) are crucial for nanoscale light manipulation.
- Controlling SPP dispersion in cavities is essential for advanced optical devices.
- Open nanocavities offer unique platforms for light-matter interactions.
Purpose of the Study:
- To experimentally investigate the influence of cavity height on plasmonic resonant properties in open circular cylinder nanocavities.
- To demonstrate a novel approach for tailoring the dispersion of surface plasmon polaritons.
- To explore the coexistence of plasmonic and optical vertical cavity modes.
Main Methods:
- Fabrication and characterization of open circular cylinder nanocavities with varying heights.
- Utilizing cathodoluminescence spectroscopy to observe plasmonic mode patterns.
- Analyzing the dependence of resonant properties, quality factor, and mode volume on cavity height.
Main Results:
- Demonstrated strong three-dimensional confinement of the electromagnetic field, influencing plasmonic properties.
- Directly observed azimuthal and axial symmetric plasmonic mode patterns at resonant wavelengths.
- Achieved a highest quality factor of 73 in a 500 nm high cavity.
- Obtained a minimum mode volume of 0.031 λ(SPP)(3) with a Purcell factor of 71.
Conclusions:
- Cavity height is a critical parameter for tuning plasmonic resonant properties in open nanocavities.
- Simultaneous excitation and coexistence of plasmonic and optical vertical cavity modes are possible.
- Open nanocavities provide a promising platform for enhanced light-emitter interactions, paving the way for plasmonic light-emitting devices and nanolasers.
