Plasmonic bandpass filter based on graphene nanoribbon.

Area of Science:

• Plasmonics
• Nanophotonics
• Graphene-based devices

Background:

• Plasmonic devices offer unique light-matter interaction properties.
• Graphene's electronic tunability presents opportunities for novel optical components.
• Developing tunable bandpass filters is crucial for optical signal processing.

Purpose of the Study:

• To propose and numerically investigate a novel plasmonic bandpass filter utilizing graphene.
• To explore the tunability of the filter's transmission spectra through structural and material parameters.
• To demonstrate the potential for band selection and power splitting applications.

Main Methods:

• Numerical investigation using the finite-difference time-domain (FDTD) method.
• Design of a simple filter structure with graphene nanoribbon waveguides and a resonator.
• Parametric studies involving coupling distance, resonator size, and graphene chemical potential.

Main Results:

• The proposed filter exhibits tunable transmission efficiency by adjusting the coupling distance.
• Transmission spectra can be tuned by altering the graphene resonant ribbon size.
• Graphene's chemical potential allows for flexible, broad-frequency tuning of transmission spectra, surpassing conventional metallic devices.
• Demonstrated capability for band selection and power splitting based on output port placement.

Conclusions:

• A simple and highly tunable graphene-based plasmonic bandpass filter has been successfully designed and investigated.
• The device leverages graphene's unique electronic properties for flexible spectral control.
• The proposed filter shows promise for advanced plasmonic devices, including band selection and power splitting applications.