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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

532
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...
532
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
602

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Updated: Sep 13, 2025

Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
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Noncontact Fiber Optic Probe for Clinical Applications of Raman Spectroscopy.

Sean Fitzgerald1,2, Eric Marple3, Jay Werkhaven4

  • 1Vanderbilt Biophotonics Center, Nashville, Tennessee, USA.

Applied Spectroscopy
|July 30, 2025
PubMed
Summary
This summary is machine-generated.

A new Raman spectroscopy (RS) probe with a miniature lens improves noncontact tissue analysis. This novel design enhances signal intensity and spatial precision for clinical applications.

Keywords:
Raman Spectroscopybiomedicalclinicaldiagnosticfiber probeminiaturenoncontact

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Area of Science:

  • Biomedical Optics
  • Spectroscopy
  • Medical Devices

Background:

  • Clinical Raman spectroscopy (RS) typically uses fiber optic probes for direct tissue contact.
  • Conventional noncontact RS probes face challenges with reduced collection efficiency and spatial precision.
  • Existing probes are limited in navigating narrow body cavities and integrating with medical instruments.

Purpose of the Study:

  • To develop a novel RS probe for efficient noncontact collection of both fingerprint (FP) and high-wavenumber (HW) Raman spectra.
  • To improve spatial precision and signal collection efficiency in noncontact RS analysis.
  • To evaluate the impact of different lens materials on spectral quality for in vivo tissue analysis.

Main Methods:

  • Stochastic light propagation simulations were used to predict performance improvements.
  • Novel RS probes with miniature lenses were designed and fabricated using various materials (fused silica, quartz, sapphire, calcium fluoride).
  • In vivo tissue analysis was performed to compare signal quality and spatial selectivity against conventional probes.

Main Results:

  • The novel probe demonstrated a 90% increase in signal intensity and a four-fold improvement in spatial selectivity during noncontact operation.
  • Crystalline lenses were found to best preserve weak Raman signals from tissues in both FP and HW regions.
  • Performance was validated against conventional RS probes, showing significant enhancements.

Conclusions:

  • The developed noncontact RS probe with a miniature lens design significantly enhances spectral collection efficiency and spatial precision.
  • Crystalline lenses are optimal for preserving Raman signal quality in dual-region analysis, though material choice depends on specific spectral needs.
  • The prototype, incorporating a widefield camera, offers a clinically compatible solution for noncontact tissue interrogation.