Tunable ultra-wideband graphene-based filter with a staggered structure

Area of Science:

• Photonics and Nanomaterials
• Electrical Engineering
• Applied Physics

Background:

• Graphene's unique electronic properties offer potential for advanced optical devices.
• Tunable filters are crucial for flexible signal processing in various applications.
• Existing ultra-wideband (UWB) filters face challenges in tunability and bandwidth control.

Purpose of the Study:

• To design and analyze a tunable ultra-wideband band-stop filter using graphene.
• To investigate the impact of graphene's Fermi level on filter performance.
• To explore structural modifications for enhanced bandwidth in nonperiodic filters.

Main Methods:

• Utilized the effective-index-based transfer matrix method (EIB-TMM) for transmission spectrum analysis.
• Simulated filter performance by manipulating the Fermi energy level of graphene.
• Optimized a staggered structure by adjusting three critical parameters.

Main Results:

• Demonstrated precise tunability of filtering properties via graphene's Fermi energy level.
• Achieved a remarkable ultra-wideband stopband through optimized staggered parameters.
• Identified key structural parameters crucial for bandwidth expansion.

Conclusions:

• Graphene-based staggered structures offer effective control over UWB band-stop filtering.
• Nonperiodic structures are a promising avenue for broadening filter bandwidth.
• The proposed design provides a foundation for future UWB device development.