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High-Q/Veff gap-mode plasmonic FP nanocavity.

Houqiang Jiang¹, Chen Liu, Pei Wang

¹Department of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China.

|March 14, 2013

Summary

Researchers developed a novel plasmonic Fabry-Perot nanocavity using a silver nanowire and dielectric gratings. This design achieves a high Q/Veff, enabling potential applications in advanced optical filters and spasers.

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Area of Science:

Plasmonics
Nanophotonics
Optical Cavities

Background:

Plasmonic nanocavities offer enhanced light-matter interactions.
Fabry-Perot cavities are fundamental optical resonators.
Achieving high quality factors (Q) and small effective volumes (Veff) is crucial for advanced photonic devices.

Purpose of the Study:

To investigate a high-Q/Veff gap-mode plasmonic Fabry-Perot nanocavity.
To explore the design parameters and properties of this novel nanocavity structure.
To assess its potential for applications in optical filters and spasers.

Main Methods:

Analytical investigation using a generalized Fabry-Perot model.
Numerical simulations to analyze nanocavity performance.

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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

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Fabrication considerations involving silver nanowires, substrates, and dielectric gratings.

Main Results:

A gap-mode plasmonic Fabry-Perot nanocavity composed of a silver nanowire on a silver substrate spaced by dielectric distributed Bragg gratings was designed.
Achieved an effective mode volume (Veff) of approximately 0.0026 (λ/n)³.
Obtained a high figure of merit (Q/Veff) of approximately 1.4 × 10⁵/μm³.

Conclusions:

The designed nanocavity demonstrates excellent performance metrics (high Q/Veff).
This plasmonic nanocavity design is a promising platform for developing novel wide band filters.
The structure holds potential for realizing efficient spaser devices.