Double plasmonic nanodisks design for electromagnetically induced transparency and slow light

Area of Science:

• Photonics and Nanotechnology
• Plasmonics and Metamaterials

Background:

• Electromagnetically induced transparency (EIT) is a quantum interference effect enabling significant optical properties.
• Plasmonic nanostructures offer miniaturization potential for optical devices.

Purpose of the Study:

• To propose and investigate a novel plasmonic analog of EIT using coupled nanodisks.
• To explore the tunability and performance of this plasmonic system for optical applications.

Main Methods:

• Theoretical analysis and numerical simulations of a metal-insulator-metal (MIM) waveguide coupled with two nanodisks.
• Investigation of the effect of nanodisk radii on resonant frequencies and EIT-like phenomena.

Main Results:

• Achieved a strong EIT-like effect by coupling a small and a large nanodisk with differing resonant frequencies.
• Demonstrated tunable transparency windows by adjusting nanodisk radii.
• The plasmonic device exhibited high transmission (>80%) and a narrow full width at half-maximum (<30nm).
• Observed a high group index (>355), indicating potential for light manipulation.

Conclusions:

• The proposed plasmonic system effectively mimics EIT, offering a new route for integrated optical circuits.
• The device functions as a high-performance EIT-like filter and shows promise for ultrafast switching, light storage, and nonlinear devices.