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Double Fano resonance in a plasmonic double grating structure.
Optics Express
|November 10, 2016
Summary
A simple plasmonic structure with gratings supports a double Fano resonance, creating narrow spectral lines. This resonance is tunable by altering grating properties or incident light angle.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Metamaterials
Background:
- Fano resonances in plasmonic structures offer sharp spectral features.
- Controlling Fano resonance properties is crucial for optical device applications.
Purpose of the Study:
- To theoretically and numerically demonstrate a nearly-degenerate double Fano resonance in a simple gratings-based plasmonic structure.
- To investigate the tunability of the double-resonance spectral location and line shape.
Main Methods:
- Theoretical analysis of plasmonic gratings.
- Numerical simulations to confirm the existence and properties of the double Fano resonance.
- Parameter variation including grating periodicity, unit-cell design, and angle of incidence.
Main Results:
- A simple gratings-based plasmonic structure supports a nearly-degenerate double Fano resonance.
- The double resonance results in a relatively narrow spectral line shape.
- Spectral location and line shape are controllable via grating parameters and angle of incidence.
Conclusions:
- The proposed structure provides a pathway to achieve narrow spectral lines using Fano resonances.
- The tunability offers design flexibility for plasmonic devices.
- This work contributes to the understanding and application of Fano resonances in nanophotonics.
