Spatiotemporal Moiré lattice light fields.

Area of Science:

• Optics and Photonics
• Wave Physics
• Light Field Engineering

Background:

• Precise control over light's spatial and temporal properties is crucial for advanced applications.
• Space-time modulation enables unique light properties like diffraction-free propagation.

Purpose of the Study:

• To theoretically propose and experimentally demonstrate spatiotemporal Moiré lattice light fields.
• To explore the generation and properties of these novel light fields.

Main Methods:

• Utilized a 4f pulse shaper for spectral control.
• Employed an x-ω (space-time) modulation strategy.
• Controlled discrete rotational symmetry of the spatiotemporal spectrum.

Main Results:

• Successfully generated tunable spatiotemporal Moiré patterns with controllable sublattice sizes.
• Confirmed diffraction-free propagation in time-averaged intensities.
• Demonstrated spatiotemporal Moiré lattices carrying transverse orbital angular momentum.

Conclusions:

• Spatiotemporal Moiré lattices offer a new platform for light-matter interaction studies.
• Potential applications exist in wave-based systems beyond optics, including acoustics and electron waves.