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Updated: Feb 12, 2026

Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations

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Optimizing laser crater enhanced Raman spectroscopy.

V N Lednev, P A Sdvizhenskii, M Ya Grishin

|April 1, 2018

Summary

Cavity production significantly enhances Raman signal detection. Laser ablation and steel needle tapping methods offer comparable signal boosts, with needle tapping providing a simple, automatable solution for rough materials.

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Published on: May 12, 2023

Area of Science:

Analytical Chemistry
Spectroscopy
Materials Science

Background:

Raman spectroscopy is a powerful technique for material analysis.
Signal enhancement is crucial for detecting low-concentration analytes or weak scatterers.
Laser-induced features can modify surface properties to improve Raman signal collection.

Purpose of the Study:

To systematically investigate Raman signal enhancement using laser crater production.
To compare laser cratering with alternative cavity production methods.
To explore the influence of experimental parameters on signal enhancement for various materials.

Main Methods:

Laser craters were generated using a pulsed Nd:YAG laser (532 nm).
Raman spectra were acquired using a commercial spectrometer with 785 nm laser excitation.
Parameters studied included pulse number, lens distance, and spot offset.
Alternative methods: steel needle tapping and hole drilling.

Main Results:

Maximum Raman signal enhancement reached 11-fold for loose powders.
Pressed tablets showed reduced enhancement (2-fold).
Steel needle tapping achieved a 10-fold enhancement in rough, highly reflective materials.
Laser ablation and needle tapping yielded comparable results, outperforming drilling.

Conclusions:

Cavity production, particularly laser ablation and needle tapping, effectively enhances Raman signals.
Needle tapping offers a simple, automatable method for signal enhancement, especially for challenging materials.
Laser cratering is suitable for automation but requires an additional pulsed laser system.