Steering frequency combs with equal line spacing and high directivity are essential for applications in precision measurement, wireless communication, and radar detection. However, existing approaches typically separate frequency comb generation from beam steering, requiring precise phase locking and multiple discrete devices. These systems not only demand ample space to accommodate multiple device structures, but also impose strict demands on physical integration and engineering implementation. Here, we present a multicolor space-time modulation approach based on programmable waveguide antennas that integrates frequency comb generation and beam steering into a single device. Using coupled-mode theory, we first validate the scattering modes in the momentum-frequency plane for monochromatic space-time modulation. We further generalize the framework to incorporate multicolor space-time modulation, achieving simultaneous control over beam-steering direction, comb line spacing, and intensity. By unifying comb generation and beam steering within a single device, our work offers a compact and reconfigurable solution for photonic and microwave systems.

Close

PrevNext

View figure in article

• Beam control
• Frequency combs & self-phase locking
• Optoelectronics
• Metasurfaces
• Wireless communication networks
• Coupled mode theory
• Radar
• Radio frequency techniques