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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.
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Updated: Apr 18, 2026

Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
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On-chip optical trapping and Raman spectroscopy using a TripleX dual-waveguide trap.

Martijn Boerkamp, Thijs van Leest, Jeroen Heldens

    Optics Express
    |January 22, 2015
    PubMed
    Summary

    This study introduces a novel dual-beam optical trapping and Raman spectroscopy system using advanced waveguides. The integrated device efficiently traps and analyzes microparticles, showing promise for microbiological applications.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Spectroscopy

    Background:

    • On-chip optical trapping and Raman spectroscopy require integrated solutions for efficiency.
    • Waveguide fabrication technologies are crucial for miniaturizing optical systems.

    Purpose of the Study:

    • To develop a novel dual-beam geometry for on-chip optical trapping and Raman spectroscopy.
    • To utilize microfabricated waveguides for integrated photonic functions.

    Main Methods:

    • Fabrication of box-shaped waveguides using TripleX technology (SiO2 and Si3N4).
    • Implementation of a dual-beam geometry for simultaneous trapping and spectroscopy.
    • Simulation of optical fields and calculation of optical forces for trapping analysis.
    • Measurement of Raman spectra from trapped polystyrene beads.

    Main Results:

    • Successfully trapped 1 μm polystyrene beads using the waveguide system.
    • Observed discrete trapping positions in the axial direction due to beam interference.
    • Achieved an average transverse trap stiffness of 0.8 pN/nm/W, indicating strong trapping.
    • Acquired Raman spectra with short integration times (down to 0.25 s).

    Conclusions:

    • The developed waveguide system enables efficient on-chip optical trapping and Raman spectroscopy.
    • The short integration times are highly promising for the analysis of microbiological cells.
    • This integrated approach offers a powerful tool for microparticle manipulation and analysis.