Enhanced deep detection of Raman scattered light by wavefront shaping

TL;DR

This paper demonstrates how wavefront shaping can significantly enhance the detection of Raman scattered light in scattering media, enabling deeper non-invasive tissue analysis without increasing irradiation levels.

Contribution

The study introduces a wavefront shaping method to improve Raman signal detection at depth, overcoming scattering limitations in biological tissues.

Findings

Enhanced Raman signal at depth using wavefront shaping

Maintained constant total irradiance during enhancement

Potential for improved non-invasive tissue diagnostics

Abstract

Light scattering limits the penetration depth of non-invasive Raman spectroscopy in biological media. While safe levels of irradiation may be adequate to analyze superficial tissue, scattering of the pump beam reduces the Raman signal to undetectable levels deeper within the tissue. Here we demonstrate how wavefront shaping techniques can significantly increase the Raman signal at depth, while keeping the total irradiance constant, thus increasing the amount of Raman signal available for detection.