Non-diffracting Bessel Beam Imaging Through Turbid Media
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Solution Overview
Problem
Current imaging techniques face challenges in visualizing internal structures through turbid media due to light scattering, making it difficult to distinguish between base and scattering components, especially in biological tissues and fluids.
Innovation Solution
The method employs non-diffracting light beams, such as Airy or Bessel beams, which maintain their shape and intensity over long distances, allowing for deeper penetration and clearer imaging by illuminating and scanning the medium, and collecting backscattered light to construct images based on intensity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional light beams are used for imaging through turbid media, then the imaging can be performed with simple equipment, but the penetration depth is limited due to light scattering
Solution Approach 1:
The patent transforms conventional diffracting Gaussian light beams into non-diffracting Bessel beams by modifying the beam's wavefront characteristics and spatial distribution. This parameter change enables the light to maintain its intensity profile over extended propagation distances, achieving deeper penetration into turbid media while resisting scattering effects.
Solution Approach 2:
The patent exploits the scattering properties of turbid media by using non-diffracting Bessel beams that can penetrate and propagate through scattering environments. Instead of being blocked by scattering, the beam's unique properties allow it to interact with the medium in a way that enables imaging through the turbid layer, converting the harmful scattering effect into a usable imaging modality.
2Length of moving object
If non-diffracting light beams are used to improve penetration depth, then imaging through turbid media becomes feasible, but the device complexity increases
Solution Approach 1:
The patent introduces an axicon optical element as an intermediary component that transforms a conventional Gaussian beam into a non-diffracting Bessel beam. This intermediary device simplifies the overall system by providing a straightforward optical transformation method, avoiding the need for complex spatial light modulators or iterative wavefront shaping systems while still achieving the desired beam characteristics for deep tissue imaging.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables effective imaging through turbid media, improving penetration depth and resolution, allowing for clearer visualization of internal structures and objects within biological tissues and fluids, even in high-scattering environments.
Implementation Method 1
non-diffracting light beams, such as Airy or Bessel beams, which maintain their shape and intensity over long distances
Implementation Method 2
scattering of the imaging light by biological organelles
Implementation Method 3
illuminating the medium by a non-diffracting light beam over a plurality of locations on a boundary of the medium to excite the fluorescent molecules
Data Source
AI summary
A method of imaging through a medium is disclosed. The method comprises: illuminating the medium by a non-diffracting light beam over a plurality of locations on a boundary of the medium; collecting back scattered light for each location of the light beam; and constructing an image based on intensity levels of the back scattered light at each of the plurality of locations, the intensity levels constituting local contrasts over the image.