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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Time domain diffuse Raman spectroscopy using single pixel detection.

Alessandro Bossi1,2, Sanathana Konugolu Venkata Sekar3, Michele Lacerenza1,4

  • 1Politecnico di Milano, Department of Physics, Milan, Italy.

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|November 29, 2023
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Summary
This summary is machine-generated.

This study introduces time-domain diffuse Raman spectroscopy (TD-DIRS) using a single-pixel detector and digital micromirror device for cost-effective, in-depth chemical analysis of thick biological tissues.

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Area of Science:

  • Biophotonics
  • Spectroscopy
  • Chemical Imaging

Background:

  • Diffuse Raman spectroscopy (DIRS) enables chemical analysis of thick biological tissues.
  • Existing DIRS methods often involve complex and expensive detection systems.
  • Depth-resolved analysis of biological tissues remains a challenge.

Purpose of the Study:

  • To develop a novel, cost-effective time-domain diffuse Raman spectroscopy (TD-DIRS) system.
  • To enable in-depth chemical analysis of thick biological tissues.
  • To overcome limitations of current DIRS detection technologies.

Main Methods:

  • Utilized a single-pixel detector and digital micromirror device (DMD) for wavelength encoding in an imaging spectrometer.
  • Employed time-of-flight distribution of photons for depth probing of Raman signals.
  • Validated the system with bilayer phantoms (tissue-bone mimicking and biological tissue-calcium carbonate).

Main Results:

  • Successfully differentiated Raman signals from layered phantom materials.
  • Reconstructed Raman spectra from individual layers in phantoms.
  • Demonstrated retrieval of Raman peaks from biological tissue phantoms despite autofluorescence.

Conclusions:

  • The novel TD-DIRS setup offers a cost-effective and high-performance solution for in-depth Raman spectroscopy.
  • The system provides potential for improved and quantitative material analysis in diffusive media.
  • This approach advances the capability for non-invasive chemical investigation of biological tissues.