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Related Concept Videos

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...
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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Related Experiment Video

Updated: Jun 20, 2026

Ultrafast Laser-Ablated Nanoparticles and Nanostructures for Surface-Enhanced Raman Scattering-Based Sensing Applications
06:15

Ultrafast Laser-Ablated Nanoparticles and Nanostructures for Surface-Enhanced Raman Scattering-Based Sensing Applications

Published on: June 16, 2023

Enhanced Raman scattering from silicon microstructures.

D V Murphy, S R Brueck

    Optics Letters
    |September 1, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers observed over 100x Raman intensity enhancement in silicon (Si) phonon modes using submicrometer Si spheres. This electromagnetic-structure-resonance effect arises from light coupling with sphere resonances.

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    Ultrafast Laser-Ablated Nanoparticles and Nanostructures for Surface-Enhanced Raman Scattering-Based Sensing Applications
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    Published on: June 16, 2023

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    Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model

    Published on: August 22, 2015

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Condensed Matter Physics

    Background:

    • Raman spectroscopy is a key technique for analyzing vibrational modes in materials.
    • Enhancing Raman scattering signals is crucial for sensitive material characterization.
    • Submicrometer dielectric structures offer unique optical properties.

    Purpose of the Study:

    • To investigate electromagnetic-structure-resonance enhancement of Raman scattering from silicon (Si) phonon modes.
    • To explore the use of submicrometer Si structures for signal amplification.
    • To understand the underlying physics of the observed enhancement.

    Main Methods:

    • Fabrication and characterization of submicrometer silicon spheres.
    • Experimental measurement of Raman scattering intensity from Si structures.
    • Analytic modeling of Raman intensity considering electromagnetic resonances.

    Main Results:

    • Observed Raman intensity enhancements exceeding 100 times compared to bulk silicon.
    • Demonstrated significant enhancement in approximately 0.1-micrometer diameter Si spheres.
    • Achieved good qualitative agreement between experimental results and analytic calculations.

    Conclusions:

    • Electromagnetic-structure-resonance coupling significantly enhances Si phonon mode scattering.
    • Submicrometer high-index dielectric spheres are effective structures for Raman signal amplification.
    • The findings provide a pathway for enhanced optical sensing and characterization of silicon-based materials.