Related Experiment Video
Updated: Jun 24, 2026
08:39
Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Ultrafast, reconfigurable all-optical beam steering and spatial light modulation.
Claudio U Hail1,2, Lior Michaeli1,3, Harry A Atwater4
1Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA, USA.
Nature Nanotechnology
|June 22, 2026
Summary
Researchers achieved ultrafast light modulation using the optical Kerr effect in a dielectric metasurface. This breakthrough enables subfemtosecond, reconfigurable control of light for advanced photonic applications.
Area of Science:
- Photonics
- Metamaterials
- Ultrafast Optics
Background:
- Spatiotemporal light control is crucial for photonic applications.
- Current methods rely on slow electronic transitions (picosecond response times).
Purpose of the Study:
- To demonstrate ultrafast, reconfigurable light modulation using the optical Kerr effect in a metasurface.
- To overcome the limitations of slow carrier relaxation in existing photonic materials.
Main Methods:
- Utilized resonant light-matter interactions in a high-quality factor dielectric metasurface.
- Employed all-optical tuning of the refractive index with a spatially structured pump beam.
- Leveraged the subfemtosecond optical Kerr effect for light modulation.
Main Results:
- Achieved pulse-limited beam steering (74-fs response time) up to ±13° in the near-infrared.
- Demonstrated programmable deflection angles controlled by the pump beam pattern.
- Observed phenomena including pump self-modulation, self-diffraction, and linear frequency conversion.
Conclusions:
- The optical Kerr effect in metasurfaces enables ultrafast, reconfigurable spatial light modulation.
- This approach offers a pathway to subwavelength and subcycle control of light.
- Potential applications in signal processing, pulse shaping, and ultrafast imaging.
