Generation of space-time wave packets in modulated J_x waveguide arrays

Area of Science:

• Photonics and Optical Engineering
• Integrated Optics
• Wave Phenomena

Background:

• Space-time wave packets (STWPs) exhibit linear dispersive spectra, allowing for diffraction-free propagation.
• Generating STWPs within integrated photonic systems presents a significant technical hurdle.

Purpose of the Study:

• To propose and demonstrate a novel method for generating STWPs in integrated waveguide arrays.
• To enable controllable propagation characteristics of STWPs, including group velocity and form.

Main Methods:

• Utilized modulated Jx waveguide arrays with equally spaced eigenspectra.
• Employed traveling-wave modulation with a single frequency to establish spatiotemporal correlation.
• Controlled modulation parameters to steer STWP group velocity and couple eigenmodes for different STWP types.

Main Results:

• Successfully generated STWPs in modulated waveguide arrays.
• Demonstrated control over STWP group velocity (positive, negative, infinite).
• Created both solid and hollow STWPs by coupling specific eigenmodes.

Conclusions:

• The proposed modulated Jx waveguide array offers a unique platform for integrated STWP generation.
• This approach facilitates on-chip space-time photonics, potentially enabling new practical applications.