Direct space to time terahertz pulse shaping with nonlinear metasurfaces

Area of Science:

• Optics and Photonics
• Materials Science
• Nonlinear Optics

Background:

• Terahertz (THz) pulse generation is crucial for various scientific and technological applications.
• Controlling the temporal shape of THz pulses remains a significant challenge.
• Nonlinear metasurfaces offer novel possibilities for light manipulation.

Purpose of the Study:

• To present a method for generating THz pulses with precisely controlled temporal shapes.
• To demonstrate the capability of nonlinear metasurfaces in shaping THz emission.
• To enable all-optical control over THz pulse characteristics.

Main Methods:

• Utilizing nonlinear metasurfaces with specific inclusion designs for single-cycle THz emission.
• Mapping the spatial amplitude and phase of the nonlinear response to the temporal pulse shape.
• Employing a reconstruction method to achieve desired pulse shapes.
• Investigating the influence of pump pulse characteristics on the emitted THz pulse.

Main Results:

• Demonstrated generation of THz pulses with tailored temporal shapes from nonlinear metasurfaces.
• Showcased the direct correlation between metasurface nonlinear response and emitted pulse waveform.
• Successfully reconstructed desired THz pulse shapes.
• Achieved generation of few-cycle THz pulses with controlled carrier-envelope properties.
• Established all-optical control over THz pulse shaping via pump pulse parameters.

Conclusions:

• Nonlinear metasurfaces provide an effective platform for generating shaped THz pulses.
• The presented method offers precise control over THz pulse temporal characteristics.
• This work opens avenues for advanced THz spectroscopy and applications requiring tailored ultrashort pulses.