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Comprehensive modeling of THz microscope with a sub-wavelength source.

Hungyen Lin¹, Christophe Fumeaux, Benjamin Seam Yu Ung

¹School of Electrical & Electronic Engineering, The University of Adelaide, SA 5005, Australia. hlin@eleceng.adelaide.edu.au

|March 30, 2011

Summary

A new computational model accurately simulates terahertz (THz) near-field microscopy, enhancing beam characterization for advanced imaging applications. This validated model offers quantitative insights into THz near-field microscopy performance.

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Area of Science:

Terahertz (THz) Science and Technology
Computational Electromagnetics
Optical Microscopy

Background:

Broadband THz near-field emission microscopy relies on sub-wavelength emission points.
Accurate modeling of these emission points is crucial for understanding THz near-field microscopy performance.
Traditional experimental approaches are complex and limit quantitative analysis.

Purpose of the Study:

To computationally model the sub-wavelength THz emission point in nonlinear electro-optical crystals.
To validate the Gaussian aperture model in the THz near-field regime.
To provide a tool for THz beam characterization in near-field microscopy applications.

Main Methods:

Computational modeling of the THz emission point as a Gaussian intensity profile aperture.
Validation of the model using dual-axis knife-edge experiments.
Application of the model to analyze a copolymer sample with sub-wavelength features.

Main Results:

The Gaussian aperture model accurately represents the THz emission point in the near-field regime.
The model successfully characterizes THz beams using realistic parameter values.
Demonstrated capability in analyzing sub-wavelength structures with THz near-field microscopy.

Conclusions:

The validated numerical model provides quantitative understanding of THz near-field microscopy performance parameters.
This model is applicable to broadband electro-optical THz near-field emission microscopy.
The model's principles can be extended to other THz near-field focused beam techniques.