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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Published on: August 30, 2012

Waveguide confined Raman spectroscopy for microfluidic interrogation.

Praveen C Ashok1, Gajendra P Singh, Helen A Rendall

  • 1SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, Fife KY16 9SS, UK. pca7@st-andrews.ac.uk

Lab on a Chip
|January 13, 2011
PubMed
Summary
This summary is machine-generated.

We developed Waveguide Confined Raman Spectroscopy (WCRS), a novel fiber-based microfluidic detection scheme. This alignment-free method enhances Raman signal collection for portable microfluidic devices.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Microfluidics

Background:

  • Microfluidic devices offer miniaturization and high throughput.
  • Raman spectroscopy provides rich chemical information but faces challenges in microfluidic integration, such as alignment and background noise.
  • Existing methods struggle with efficient signal collection and substrate interference.

Purpose of the Study:

  • To introduce and validate a novel fiber-based microfluidic Raman spectroscopic detection scheme.
  • To demonstrate an alignment-free and substrate-independent Raman detection method for microfluidics.
  • To explore the scalability and applicability of the new technique in various microfluidic systems.

Main Methods:

  • Implementation of a fiber-based microfluidic Raman spectroscopic detection scheme (Waveguide Confined Raman Spectroscopy - WCRS).
  • Embedding fibers on-chip to confine excitation and collection regions for maximal Raman signal.
  • Investigating the effects of fiber length, collection angle, and core size on collection efficiency and fluorescence background.
  • Utilizing urea as a model analyte to study concentration prediction capabilities.

Main Results:

  • Successful implementation of WCRS, enabling microfluidic dimensions down to micrometers.
  • Achieved completely alignment-free Raman spectroscopic detection with no substrate background.
  • Demonstrated efficient Raman signal collection and investigated key parameters affecting performance.
  • Validated the device's ability to predict analyte concentration (urea).

Conclusions:

  • WCRS offers a scalable, alignment-free Raman spectroscopic detection solution for microfluidics.
  • The technique can be integrated with other microfluidic functional devices, such as microreactors and microdroplet systems.
  • WCRS facilitates the development of portable, cost-effective microfluidic devices for wider Raman spectroscopy applications.