Lensless imaging from diffraction intensity measurements by use of a noniterative phase-retrieval method

Area of Science:

• Physics
• Optics
• Wave Phenomena

Background:

• Reconstructing complex object amplitude from diffraction patterns is crucial for high-frequency wave phenomena.
• Existing noniterative phase-retrieval methods have limitations.

Purpose of the Study:

• To propose a new noniterative method for reconstructing complex amplitude from Fresnel diffraction patterns.
• To address challenges in high-frequency wave phenomena like X-rays and electron waves.
• To enable retrieval of phase vortices.

Main Methods:

• Utilizes Fresnel diffraction patterns of an object illuminated by coherent waves.
• Employs a noniterative phase-retrieval method.
• Substitutes a Gaussian filter with the Fraunhofer diffraction pattern of a circular aperture.

Main Results:

• Successfully reconstructs the complex amplitude of an object.
• Demonstrates the efficacy of using Fraunhofer diffraction pattern as a Gaussian filter substitute.
• Achieves retrieval of phase vortices, an advantage over other methods.

Conclusions:

• The proposed method offers an efficient noniterative approach for complex amplitude reconstruction.
• This technique is applicable to high-frequency wave phenomena.
• The ability to retrieve phase vortices enhances its utility in wave optics and imaging.