Dynamically tunable plasmon induced transparency in a graphene-based nanoribbon waveguide coupled with graphene...

Area of Science:

• Nanophotonics
• Plasmonics
• Graphene-based devices

Background:

• Plasmon induced transparency (PIT) is a quantum interference effect.
• Graphene offers tunable optical properties via Fermi level modulation.
• Existing PIT structures often face design and fabrication challenges.

Purpose of the Study:

• To propose and numerically investigate a dynamically tunable PIT effect in a graphene nanoribbon waveguide coupled with graphene resonators.
• To explore methods for achieving PIT through direct and indirect coupling mechanisms.
• To demonstrate the tunability and potential for multi-PIT effects in an ultracompact structure.

Main Methods:

• Utilizing a graphene-based nanoribbon waveguide coupled with graphene rectangular resonators on a sapphire substrate.
• Modulating the Fermi energy level of graphene to tune the plasmonic response.
• Employing numerical simulations to analyze the PIT phenomenon and its tunability.

Main Results:

• Achieved dynamically tunable PIT by shifting the Fermi energy levels of graphene resonators.
• Demonstrated high tunability of the PIT transparency window.
• Numerically predicted double PIT effects in a structure with series of graphene resonators.
• Showcased a design that is easier to fabricate compared to previous graphene-based PIT schemes.

Conclusions:

• The proposed graphene-based structure enables dynamic tunability of PIT.
• The simplified design and fabrication facilitate the realization of integrated nanophotonic devices.
• This work holds significant potential for applications in multi-channel-selective filters, sensors, and slow light technologies.