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Related Experiment Video

Updated: Apr 26, 2026

Visualizing Diffusional Dynamics of Gold Nanorods on Cell Membrane using Single Nanoparticle Darkfield Microscopy

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Published on: March 5, 2021

A simple method to disentangle nanoparticle optical properties by darkfield microspectroscopy.

Alessio Gnerucci¹, Fulvio Ratto, Sonia Centi

¹Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, I-50139, Florence, Italy.

Microscopy Research and Technique

|July 29, 2014

Summary

This study introduces a darkfield optical microspectroscopy method to precisely measure nanoparticle (NP) absorption and scattering. The technique accurately quantifies optical properties across various concentrations, offering a robust tool for colloid analysis.

Keywords:

darkfield microspectroscopy optical extinction plasmonic nanoparticles scattering

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Area of Science:

Optical Spectroscopy
Nanotechnology
Materials Science

Background:

Accurate characterization of nanoparticle (NP) optical properties is crucial for their application.
Existing methods often require complex setups or are limited in their ability to disentangle absorption and scattering.
Quantifying optical coefficients like absorption and scattering cross sections independently is challenging.

Purpose of the Study:

To develop and validate a darkfield optical microspectroscopy technique for disentangled measurement of NP absorption and scattering cross sections.
To assess the method's robustness by analyzing statistical and systematic errors.
To demonstrate the technique's application using a gold nanoparticle (NP) colloid.

Main Methods:

Utilized a darkfield optical microspectroscopy setup with a variable numerical aperture objective on an inverted microscope.
Acquired spectra in both darkfield and brightfield configurations.
Applied Lambert-Beer (LB) equation modeling, combining three spectra with varying objective apertures, to disentangle absorption, scattering, and extinction coefficients.

Main Results:

Successfully measured absorption and scattering cross sections for gold NPs as a function of particle number density (0.04–3.94 µm⁻³).
Demonstrated good linearity of optical coefficients up to approximately 1.5 µm⁻³ (∼1 mM Au concentration).
Identified typical plasmonic resonances around 520 nm and 750 nm and quantified extinction and scattering cross sections.

Conclusions:

The presented darkfield optical microspectroscopy technique provides a robust and accurate method for disentangling NP absorption and scattering coefficients.
The method is validated through error analysis and exemplary measurements on gold NPs, showing good linearity over a significant concentration range.
This technique is broadly applicable to various colloids with UV-Vis-NIR spectral features and holds potential for NP localization in biological samples.