Continuous-wave terahertz reflective ptychography by oblique illumination

Area of Science:

• Optics and Photonics
• Terahertz Science and Technology

Background:

• Terahertz (THz) reflective imaging is crucial for various applications.
• Existing methods face challenges with illumination non-uniformity and complex object reconstruction.

Purpose of the Study:

• To adapt ptychography for continuous-wave terahertz reflective imaging.
• To develop a lensless imaging scheme for improved THz reflective imaging.

Main Methods:

• Application of ptychography to continuous-wave THz reflective imaging.
• Implementation of a compact, lensless, full-field oblique-illumination setup.
• Utilizing tilted plane correction for diffraction pattern analysis.

Main Results:

• Successful retrieval of the complex-valued object function.
• Effective suppression of non-uniform illumination artifacts.
• Demonstrated feasibility using two distinct metal samples.

Conclusions:

• Ptychography is a viable technique for continuous-wave THz reflective imaging.
• The proposed lensless scheme offers a robust solution for THz imaging challenges.
• This method enhances the accuracy and reliability of THz reflective imaging.