Accurate simulation of THz generation with finite-element time domain methods

Area of Science:

• Nonlinear Optics
• Computational Physics
• Materials Science

Background:

• Accurate simulation of complex nonlinear optical processes is crucial for scientific advancement.
• Traditional methods often rely on approximations like the slowly varying envelope approximation, limiting their scope.
• Understanding phenomena like terahertz generation requires robust simulation techniques.

Purpose of the Study:

• To develop a mathematical model and numerical simulation techniques for accurate full broadband simulation of complex nonlinear optical processes.
• To overcome limitations of existing approximations in nonlinear optics simulations.
• To elucidate terahertz (THz) generation in periodically poled Lithium Niobate (PPLN) and optical harmonic generation.

Main Methods:

• Development of a time-domain mathematical model.
• Implementation of numerical simulation techniques without the slowly varying envelope approximation.
• Application of the model to simulate THz generation in PPLN and optical harmonic generation.

Main Results:

• Demonstration of accurate full broadband simulation capabilities for complex nonlinear optical processes.
• Successful elucidation of THz generation mechanisms in PPLN.
• Validation of the model's accuracy through numerical simulations.

Conclusions:

• The developed time-domain model provides accurate broadband simulation of nonlinear optical processes.
• This method offers a more comprehensive approach compared to approximations.
• The simulations provide valuable insights into THz generation in PPLN and related optical phenomena.