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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Simulation study on cascaded terahertz pulse generation in electro-optic crystals.

Toshiaki Hattori, Kousuke Takeuchi

|June 24, 2009

Summary

Cascaded optical rectification generates intense terahertz (THz) pulses in electro-optic crystals, exceeding theoretical efficiency limits. Simulations reveal spectral red shifting and explore factors affecting THz generation.

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Area of Science:

Optics and Photonics
Terahertz (THz) Science and Technology
Nonlinear Optics

Background:

Terahertz (THz) pulse generation is crucial for various scientific and technological applications.
Cascaded optical rectification offers a promising route for efficient THz wave production.
Understanding the underlying physics is key to optimizing THz generation efficiency.

Purpose of the Study:

To investigate cascaded optical rectification processes for intense THz pulse generation.
To simulate THz and optical field propagation in electro-optic crystals.
To analyze factors influencing THz generation efficiency and spectral characteristics.

Main Methods:

One-dimensional coupled propagation equations for THz and optical fields were utilized.

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Simulations were performed under ideal conditions (perfect phase matching, no absorption).

Effects of absorption, phase mismatch, and pulse width were examined using ZnTe crystal parameters.

Main Results:

Cascaded optical rectification achieved THz pulse generation efficiencies exceeding the Manley-Rowe limit under ideal conditions.
Significant red shifting of the pump light spectrum was observed.
Finite absorption, phase mismatches, and pulse width were found to impact THz generation.

Conclusions:

Cascaded optical rectification is a highly efficient method for generating intense THz pulses.
Optimizing phase matching and minimizing absorption are critical for maximizing THz output.
Multiple pulse pumping can potentially enhance THz field generation.