Double-graphene-layer terahertz laser: concept, characteristics, and comparison.

Area of Science:

• Optoelectronics and Photonics
• Condensed Matter Physics
• Materials Science

Background:

• Terahertz (THz) lasers are crucial for various applications, but existing technologies face limitations.
• Graphene-based lasers offer potential for novel THz emission, yet require further development.
• Injection lasers based on interband transitions in graphene have been explored.

Purpose of the Study:

• To propose and analyze a new concept for injection terahertz (THz) lasers.
• To utilize resonant radiative transitions between double graphene layers (double-GL) for THz generation.
• To compare the performance of double-GL THz lasers with existing graphene laser designs.

Main Methods:

• Theoretical analysis of double-graphene-layer (double-GL) structures.
• Calculation of key characteristics for proposed double-GL THz lasers.
• Comparative analysis against graphene lasers utilizing intra-GL interband transitions.

Main Results:

• Demonstration of double-GL THz lasers operating across a wide THz frequency range.
• Identification of advantages including reduced Drude absorption and weaker temperature dependence.
• Observation of voltage-tunable spectrum and favorable injection conditions.

Conclusions:

• Double-graphene-layer structures provide a promising platform for advanced injection THz lasers.
• The proposed design offers significant improvements over existing graphene-based THz laser concepts.
• These findings pave the way for next-generation tunable and efficient THz sources.