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Gradient moiré perovskite superlattices for laser beam steering
Nanli Mou1,2, Bing Tang3,4, Delin Zhang1
1Guangdong Basic Research Center of Excellence for Aggregate Science, School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China.
Science Advances
|November 12, 2025
Summary
Researchers developed gradient moiré perovskite superlattices for dynamic laser beam steering. This novel approach enables continuous, wide-angle tuning of laser emission from a single device, advancing photonic technologies.
Area of Science:
- Photonics and Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Laser emission control is crucial for many technologies.
- Compact lasers with integrated beam steering are highly sought after but challenging to develop.
- Moiré superlattices offer unique tunable optical properties.
Purpose of the Study:
- To demonstrate dynamic laser beam steering using gradient moiré perovskite superlattices.
- To investigate the relationship between moiré structure and laser emission characteristics.
- To create a tunable platform for light-matter interactions in photonic devices.
Main Methods:
- Fabrication of gradient moiré photonic superlattices by combining 2D square lattices and curved 1D perovskite gratings.
- Analysis of moiré interlayer coupling and its effect on cavity modes.
- Characterization of lasing properties and beam steering capabilities by varying twist angles.
Main Results:
- Successfully created gradient moiré perovskite superlattices with continuously variable twist angles.
- Observed moiré-induced band-edge modes supporting low-threshold lasing.
- Achieved continuous and wide-range (>30°) tuning of laser emission angles from a single device by manipulating pump area and twist angles.
Conclusions:
- Gradient moiré perovskite superlattices provide a highly tunable platform for controlling laser emission.
- This technology enables dynamic laser beam steering, paving the way for programmable and intelligent photonic applications.
- The findings advance the understanding of moiré-induced light-matter interactions for future optoelectronic devices.
