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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Related Experiment Video

Updated: Jun 22, 2026

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
15:06

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Published on: January 3, 2016

Forward scattering measurement device with a high angular resolution.

David Roßkamp, Frederic Truffer, Sylvain Bolay

    Optics Express
    |June 18, 2009
    PubMed
    Summary

    A novel optical device accurately measures forward scattered light using an avalanche photodiode (APD). Results align with Mie theory, validating its effectiveness for particle size analysis.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Analytical Chemistry

    Background:

    • Accurate measurement of light scattering is crucial for particle characterization.
    • Existing methods may have limitations in angular range or sensitivity.
    • Developing new optical devices can enhance precision in scattered light analysis.

    Purpose of the Study:

    • To develop and test a new optical device for measuring forward scattered light.
    • To quantify scattered light within a specific angular range (3 to 20 degrees).
    • To validate the device's performance against established theoretical models.

    Main Methods:

    • Designed an optical device focusing scattered light onto a plane.
    • Employed a motorized iris diaphragm to select specific scattering angles.

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    Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

    Published on: December 8, 2016

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    Last Updated: Jun 22, 2026

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  • Utilized an integrating sphere and an avalanche photodiode (APD) for signal detection.
  • Tested the device with polystyrene microsphere suspensions of varying sizes.

    • Main Results:

    • The device successfully measured forward scattered light between 3 and 20 degrees.
    • Axial position on the focal plane correlated with scattering angle.
    • Experimental data showed good agreement with predictions from Mie theory.
    • The device demonstrated reliable performance with different particle sizes.

    Conclusions:

    • The developed optical device is effective for measuring forward scattered light.
    • The device's accuracy is validated by its concordance with Mie theory.
    • This instrument offers a promising tool for particle size analysis and characterization.