Tunable Plasmonic Band-Pass Filter with Dual Side-Coupled Circular Ring Resonators

Area of Science:

• Photonics and Plasmonics
• Nanotechnology
• Optical Engineering

Background:

• Metal-insulator-metal (MIM) structures are crucial for plasmonic devices.
• Asymmetric dual circular ring resonators offer unique optical properties.
• Achieving tunable optical responses is key for advanced photonic applications.

Purpose of the Study:

• To propose and numerically simulate a novel wavelength band-pass filter.
• To investigate the optical response of a MIM structure with asymmetric dual circular ring resonators.
• To demonstrate tunable plasmon-induced absorption (PIA) optical responses.

Main Methods:

• Numerical simulation of a metal-insulator-metal (MIM) structure.
• Design incorporating asymmetric dual circular ring resonators and a baffle.
• Analysis of transmission spectrum and optical response tuning via structural adjustments.

Main Results:

• The proposed filter exhibits a sharp and asymmetric transmission spectrum profile.
• Tunable plasmon-induced absorption (PIA) optical response achieved by adjusting resonator radius and embedded material.
• The structure demonstrates potential for compact filter designs.

Conclusions:

• The novel MIM filter design shows promise for efficient filtering tasks.
• Tunable PIA optical responses are achievable, enabling versatile applications.
• The proposed structure has significant potential for filters and sensors in visible and near-infrared regions.