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Ultra-compact injection terahertz laser using the resonant inter-layer radiative transitions in multi-graphene-layer
Optics Express
|January 7, 2017
Summary
We optimized surface plasmonic metal waveguides for terahertz graphene lasers. This design achieves high gain (~500 cm⁻¹) at 8 THz and enables ultra-compact, room-temperature operation.
Area of Science:
- Optics and Photonics
- Materials Science
- Semiconductor Physics
Background:
- Terahertz (THz) semiconductor lasers require optimized resonators for high gain and low loss.
- Graphene-based lasers offer potential for novel THz applications.
- Surface plasmonic waveguides are key to enhancing light-matter interactions.
Purpose of the Study:
- To optimize the surface plasmonic metal waveguide geometry for THz injection lasers.
- To investigate graphene layer configurations for maximum net modal gain.
- To demonstrate the feasibility of ultra-compact, voltage-tunable graphene lasers.
Main Methods:
- Theoretical modeling and optimization of surface plasmonic metal waveguide geometry.
- Analysis of resonant radiative transitions in tunnel-coupled graphene layers.
- Gain and threshold length calculations at various frequencies.
Main Results:
- An optimal number of graphene layer pairs was identified for maximum net modal gain.
- Maximum gain reached approximately 500 cm⁻¹ at 8 THz.
- Achieved a threshold laser resonator length as low as 50 μm.
Conclusions:
- The optimized plasmonic waveguide design enables high gain in graphene THz lasers.
- Ultra-compact, voltage-tunable graphene-based lasers operating at room temperature are feasible.
- This work paves the way for practical THz graphene laser devices.
