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Continuous-wave terahertz self-referencing digital holography based on Fresnel's mirrors
Optics Letters
|February 15, 2020
Summary
A new self-referencing terahertz digital holography (TDH) method using Fresnel’s mirrors improves imaging stability and eliminates twin images. This technique offers a robust approach for terahertz phase-contrast imaging applications.
Area of Science:
- Optics and Photonics
- Imaging Science
Background:
- Continuous-wave terahertz digital holography (TDH) is an established full-field phase-contrast imaging technique.
- Existing TDH geometries include in-line and Mach-Zehnder off-axis configurations.
Purpose of the Study:
- To propose a novel self-referencing terahertz digital holography (TDH) approach.
- To enhance temporal stability and eliminate twin images in TDH.
Main Methods:
- A self-referencing TDH configuration utilizing Fresnel’s mirrors was developed.
- The object wavefront is partitioned and reflected, leading to interference and off-axis hologram formation.
- Phase-contrast imaging performance was evaluated using various sample types.
Main Results:
- The proposed Fresnel’s mirrors TDH configuration demonstrated immunity to superposed twin images.
- The new recording configuration exhibited higher temporal stability compared to traditional Mach-Zehnder interferometers.
- Successful phase-contrast imaging of different samples was achieved.
Conclusions:
- The self-referencing TDH method based on Fresnel’s mirrors offers a stable and twin-image-free approach for terahertz phase-contrast imaging.
- This technique presents a promising advancement for applications requiring high-quality terahertz imaging.
