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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...

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
08:12

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Published on: March 13, 2013

Cavity-enhanced on-chip absorption spectroscopy using microring resonators.

Arthur Nitkowski1, Long Chen, Michal Lipson

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.

Optics Express
|August 6, 2008
PubMed
Summary
This summary is machine-generated.

We developed an on-chip laser absorption spectroscopy system using silicon microring resonators and microfluidics. This miniaturized device enables sensitive detection of small liquid volumes for lab-on-a-chip applications.

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Area of Science:

  • Photonics
  • Microfluidics
  • Spectroscopy

Background:

  • Laser absorption spectroscopy is crucial for chemical analysis.
  • Miniaturization of spectroscopy systems is essential for lab-on-a-chip devices.
  • Integrating microfluidics with optical components enhances sensitivity.

Purpose of the Study:

  • To demonstrate on-chip laser absorption spectroscopy.
  • To utilize silicon microring resonators for enhanced light-liquid interaction.
  • To develop a compact spectroscopy device for lab-on-a-chip applications.

Main Methods:

  • Fabrication of silicon microring resonators with high Q-factor (>100,000).
  • Integration of polydimethylsiloxane (PDMS) microfluidic channels with resonators.
  • Measurement of N-methylaniline absorption spectra from 1460 nm to 1610 nm with 1 nm resolution.

Main Results:

  • Successful on-chip laser absorption spectroscopy demonstrated.
  • Effective free space path lengths up to 5 mm achieved.
  • Absorption spectra of <2 nL N-methylaniline measured with high resolution.

Conclusions:

  • Silicon microring resonators integrated with microfluidics enable on-chip spectroscopy.
  • The developed system offers high sensitivity for small sample volumes.
  • This technology paves the way for fully integrated lab-on-a-chip spectroscopy devices.