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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

443
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...
443
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
450

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Probing Local Optical Fields via Ultralow Frequency Raman Scattering from a Corrugated Probe.

Chih-Feng Wang1, Alexander B C Mantilla2, Andrey Krayev3

  • 1Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States.

The Journal of Physical Chemistry Letters
|September 12, 2023
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Summary

This study introduces ultralow frequency Raman scattering from metallic probes for nanoscale optical field imaging. This method enables non-invasive visualization of plasmonic particles and material differentiation with high resolution.

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Area of Science:

  • Nanophotonics
  • Spectroscopy
  • Materials Science

Background:

  • Tip-enhanced Raman scattering (TERS) typically uses molecular reporters to map local optical fields.
  • Probing local fields with high spatial resolution is crucial for understanding nanoscale phenomena.

Purpose of the Study:

  • To demonstrate ultralow frequency Raman (ULF) scattering from metallic probes as an alternative for nanoscale optical field imaging.
  • To explore the capabilities of ULF-TERS for visualizing plasmonic structures and differentiating materials.

Main Methods:

  • Utilizing ULF Raman scattering from a nanocorrugated metallic probe in a TERS setup.
  • Employing non-invasive tapping mode feedback for imaging.
  • Analyzing ULF-TERS signals from plasmonic nanoparticles and material interfaces.

Main Results:

  • Achieved bright ULF-TERS response from the metallic probe itself.
  • Enabled non-invasive local field imaging with high spatial resolution (down to 5 nm).
  • Successfully visualized local fields of small plasmonic particles (≥20 nm) and distinguished Si/SiO2 domains.

Conclusions:

  • ULF-TERS from metallic probes offers a viable, non-invasive alternative to molecular reporters for nanoscale optical field imaging.
  • The technique provides high resolution for characterizing plasmonic materials and semiconductor interfaces.