Scanning-free imaging through a single fiber by random spatio-spectral encoding.

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Materials Science

Background:

• Traditional 2D imaging often requires bulky scanning mechanisms.
• Fiber-based imaging is desirable for minimally invasive procedures but faces challenges with signal encoding and robustness.
• Scattering media can manipulate light, but their application in direct imaging through single fibers is complex.

Purpose of the Study:

• To develop a scanner-free 2D imaging approach utilizing a single optical fiber.
• To encode spatial information from a 2D object into spectral signatures using a scattering medium.
• To demonstrate the feasibility of reconstructing 2D images from spectral data collected at the fiber's proximal end.

Main Methods:

• A random scattering medium was integrated at the fiber's distal end.
• Each pixel of the 2D object was encoded with a unique random spectral signature via scattering.
• 2D images were reconstructed from a single spectral measurement at the fiber's proximal end.
• The system's performance was evaluated with externally illuminated 2D objects.

Main Results:

• Successful 2D imaging of externally illuminated objects was demonstrated through a single fiber.
• The technique successfully encoded spatial information into distinct spectral signatures.
• The imaging approach proved insensitive to fiber bending, a critical factor for endoscopic use.
• A single spectrum measurement at the fiber's proximal end was sufficient for image reconstruction.

Conclusions:

• The proposed method offers a novel, scanner-free approach for 2D imaging via a single fiber.
• The use of a scattering medium for spectral encoding provides a robust and potentially cost-effective imaging solution.
• The insensitivity to fiber bending highlights its potential for advanced endoscopic imaging applications.