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Topography of hidden objects using THz digital holography with multi-beam interferences
Optics Express
|August 10, 2017
Summary
We developed a new method for terahertz (THz) digital holography to separate signals from objects behind transparent samples. This technique significantly improves holographic reconstructions compared to standard methods.
Area of Science:
- Physics
- Optics
- Imaging Science
Background:
- Terahertz (THz) digital holography is a powerful imaging technique.
- Separating signals from objects obscured by transparent materials remains a challenge.
Purpose of the Study:
- To present a novel method for separating object signals in THz digital holography with reflection.
- To improve holographic reconstructions of objects hidden behind THz-transparent samples.
Main Methods:
- The method combines three interference patterns to retrieve object beam amplitude and phase.
- It utilizes a three-beam interference model for pattern description.
- Simulations and experimental validation were performed using a metallic resolution target behind Teflon.
Main Results:
- The proposed method successfully separates the scattered signal from the object.
- Experimental and simulated interference patterns align with the three-beam interference model.
- Holographic reconstructions show significant improvement over standard Fourier transform phase retrieval methods.
Conclusions:
- The developed method effectively enhances THz digital holography for imaging through transparent samples.
- This technique offers a substantial improvement in holographic reconstruction quality.
