Optimization-Based Terahertz Imaging
- Resource Type
- Periodical
- Authors
- Tsai, H.-R.; Enderli, F.; Feurer, T.; Webb, K. J.
- Source
- IEEE Transactions on Terahertz Science and Technology IEEE Trans. THz Sci. Technol. Terahertz Science and Technology, IEEE Transactions on. 2(5):493-503 Sep, 2012
- Subject
- Fields, Waves and Electromagnetics
Image reconstruction
Imaging
Detectors
Dielectric constant
Laser beams
Optimization
Mathematical model
terahertz (THz) imaging
- Language
- ISSN
- 2156-342X
2156-3446
A terahertz (THz) imaging modality based on nonlinear optimization that is not limited by weak scatter or low refractive index is presented. Two-dimensional reconstructions of sub-wavelength dielectric cylinders in air are performed through iterative coordinate descent (ICD) optimization in a Bayesian framework using experimental data obtained by illuminating the objects with a THz beam. Strategies for avoiding local minima and to allow for faster convergence and improved image quality are presented and evaluated.