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Enhanced Reflection of GaAs Nanowire Laser Using Short-Period, Symmetric Double Metal Grating Reflectors
1School of Electronics and Communication Engineering, Guangzhou University, Guangzhou 510006, China.
Nanomaterials (Basel, Switzerland)
|May 14, 2022
Summary
This study introduces a novel nanowire laser structure using double silver gratings. This design significantly enhances reflectivity, reducing the threshold gain for efficient lasing emission in nanowires.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Individual nanowires can achieve lasing due to high refractive index contrast.
- End facet reflection is often insufficient for low threshold gain, particularly in smaller diameter nanowires.
Purpose of the Study:
- To propose and analyze a novel nanowire laser structure utilizing double silver gratings.
- To enhance feedback mechanisms and reduce threshold gain for nanowire lasers.
Main Methods:
- Utilized the finite element method to calculate reflective properties of the proposed structure.
- Simulated reflectivity of nanowires with double silver gratings compared to single gratings and no gratings.
Main Results:
- Double silver gratings achieve high reflectivity (>90% with >8 periods).
- Reflectivity is significantly enhanced, especially for small diameter nanowires (17x for 150 nm).
- Double gratings outperform single gratings in reflective performance.
Conclusions:
- The proposed double grating structure effectively enhances round-trip feedback and lowers threshold gain.
- This design enables efficient lasing in nanowires with reduced gain requirements.
- Short grating periods are achievable, benefiting on-chip interconnection systems.
