Lensless complex amplitude image retrieval through a visually opaque scattering medium

Area of Science:

• Optics and Photonics
• Image Reconstruction
• Wavefront Sensing

Background:

• Imaging through scattering media remains a significant challenge in optics.
• Complex amplitude information is crucial for full object characterization but difficult to retrieve.
• Traditional imaging systems are limited by aberrations and physical constraints.

Purpose of the Study:

• To demonstrate a lensless method for retrieving complex amplitude images through visually opaque scattering media.
• To encode and reconstruct object information using interference patterns from spatially fluctuating fields.
• To overcome limitations of conventional imaging in non-ideal optical environments.

Main Methods:

• Utilizing intensity measurements of scattered light from a visually opaque diffuser.
• Employing a phase-retrieval algorithm to reconstruct the interference pattern.
• Implementing a lensless optical configuration to avoid aberration effects.

Main Results:

• Successful digital regeneration of the interference pattern from a single Charge Coupled Device (CCD) image.
• Recovery of complex fields for optical vortices with two different topological charges.
• Demonstration of lensless complex amplitude image retrieval through scattering.

Conclusions:

• The proposed lensless technique effectively retrieves complex amplitude images from scattered light.
• This method offers a promising solution for imaging in scenarios where conventional optics are not feasible.
• The ability to reconstruct optical vortices highlights the technique's potential for advanced optical applications.