Terahertz generation in parallel plate waveguides activated by nonlinear metasurfaces

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Nonlinear metasurfaces are known to generate broadband terahertz (THz) radiation.
• Controlling THz emission properties is crucial for advanced applications.

Purpose of the Study:

• To present an extended Maxwell-Hydrodynamic model for simulating THz emission from metal-dielectric interfaces.
• To investigate THz emission tuning mechanisms in nonlinear metasurfaces.
• To propose and analyze a novel metasurface-activated waveguide platform for efficient THz waveguide mode generation.

Main Methods:

• Numerical simulations using an extended Maxwell-Hydrodynamic model.
• Application of the model to split ring resonator metasurfaces.
• Analysis of THz emission as a function of excitation laser duration.
• Investigation of a proposed metasurface-activated waveguide platform.

Main Results:

• The model successfully simulates THz emission from nonlinear metasurfaces.
• A tuning mechanism for spectral peak position and intensity of THz radiation was identified.
• The proposed waveguide platform demonstrates efficient generation of THz waveguide modes.
• Tunability of the generated THz modes was confirmed.

Conclusions:

• The extended Maxwell-Hydrodynamic model provides a powerful tool for studying THz emission.
• The identified tuning mechanisms offer control over THz radiation characteristics.
• The novel metasurface-activated waveguide platform shows significant potential for future THz technologies.