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High-efficiency upward radiation in a slow-light grating beam scanner.
Optics Express
|June 29, 2023
Summary
We developed a high-efficiency slow-light grating (SLG) that selectively radiates light upward, overcoming efficiency limits of conventional designs. This advancement significantly improves performance for applications like light detection and ranging.
Area of Science:
- Optics
- Photonics
- Materials Science
Background:
- Slow-light gratings (SLGs) are utilized as solid-state optical beam scanners.
- Conventional SLGs suffer from reduced efficiency due to unwanted downward radiation.
Purpose of the Study:
- To develop a high-efficiency SLG with selective upward radiation.
- To enhance the performance of optical beam scanning technologies.
Main Methods:
- Designed a novel SLG structure incorporating through-hole and surface gratings.
- Employed covariance matrix adaptation evolution strategy for structural optimization.
- Conducted experimental validation of the designed SLG.
Main Results:
- Achieved a maximum upward emissivity of 95%.
- Demonstrated experimental enhancement of emissivity by 2-4 dB.
- Improved roundtrip efficiency by 5.4 dB.
Conclusions:
- The novel SLG design effectively minimizes downward radiation and maximizes upward emission.
- The enhanced efficiency is significant for practical applications, particularly in light detection and ranging (LiDAR).
- This work presents a substantial improvement in SLG performance for optical scanning.
