Dynamically controllable plasmon induced transparency based on hybrid metal-graphene metamaterials

Area of Science:

• Metamaterials
• Plasmonics
• Terahertz (THz) Technology

Background:

• Plasmon induced transparency (PIT) is a phenomenon enabling narrow transmission windows in otherwise opaque materials.
• Graphene's tunable properties offer potential for dynamic control in plasmonic devices.

Purpose of the Study:

• To numerically explore novel hybrid metal-graphene metamaterials for dynamically controllable PIT windows in the THz regime.
• To investigate the generation of single, double, and multiple PIT windows through structural and material design.

Main Methods:

• Numerical exploration of hybrid metal-graphene metamaterial structures.
• Analysis of plasmonic resonances and interference mechanisms (bright-dark and bright-bright modes).
• Investigation of graphene's conductivity and damping for tunability control.

Main Results:

• A novel PIT window was generated using a metal strip and graphene-integrated ring structure.
• Double PIT windows with 100% spectral contrast ratio were achieved through asymmetrical ring division, originating from distinct interference mechanisms.
• Multiple PIT windows were realized by introducing additional bright modes.
• Significant group delays (up to 43 ps) were observed at PIT windows.

Conclusions:

• Hybrid metal-graphene metamaterials offer a promising platform for dynamically tunable PIT windows in the THz range.
• The strong interaction between graphene and metal structures enables precise control over optical properties.
• Potential applications include advanced filters, modulators, switches, sensors, and optical buffers.