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All-optical, an ultra-thin endoscopic photoacoustic sensor using multi-mode fiber
Nadav Shabairou1, Benjamin Lengenfelder2,3, Martin Hohmann2,3
1Faculty of Engineering, Bar-Ilan University, Ramat-Gan, 52900, Israel. shabain@biu.ac.il.
Scientific Reports
|June 6, 2020
Summary
All-optic photoacoustic sensors using multimode fibers offer a novel, ultra-thin solution for in-vivo imaging. This advancement overcomes limitations of traditional mechanical transducers, enabling contact-free photoacoustic signal detection.
Area of Science:
- Biomedical Optics
- Medical Imaging
- Fiber Optics
Background:
- Photoacoustic endoscopy (PAE) traditionally uses mechanical ultrasound transducers.
- These transducers require direct contact and are difficult to miniaturize.
- All-optic sensors offer a promising alternative for contact-free sensing.
Purpose of the Study:
- To demonstrate photoacoustic signal sensing through a multimode fiber (MMF).
- To develop an ultra-thin endoscopic photoacoustic sensor.
- To explore advanced signal processing for improved PAE.
Main Methods:
- Utilizing a multimode fiber for all-optic photoacoustic signal detection.
- Employing the optical-flow method for speckle sensing.
- Applying speckle reconstruction without direct speckle imaging.
Main Results:
- Successful sensing of photoacoustic signals through an MMF.
- Extraction of photoacoustic signals despite mode-mixing in the MMF.
- Demonstration of a speckle reconstruction method applicable to MMFs.
Conclusions:
- MMF-based all-optic sensors provide an ultra-thin solution for PAE.
- The optical-flow and speckle reconstruction methods enable effective signal extraction.
- This approach advances the development of minimally invasive photoacoustic imaging technologies.
