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Simultaneous Label-Free Autofluorescence Multi-Harmonic Microscopy

Simultaneous Label-Free Autofluorescence Multi-Harmonic Microscopy

Published on: August 29, 2025

Near-field imaging with a localized nonlinear light source.

Stefano Palomba¹, Lukas Novotny

¹Institute of Optics, University of Rochester, Rochester, New York 14627, USA.

|August 25, 2009

Summary

This summary is machine-generated.

We developed a new high-resolution imaging technique using gold nanoparticles as a light source. This method utilizes nonlinear optical signals for advanced fluorescence and extinction imaging of nanoscale samples.

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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

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Area of Science:

Nanophotonics
Nonlinear Optics
Plasmonics

Background:

High-resolution imaging is crucial for nanoscale characterization.
Conventional light sources can be limited in resolution and excitation control.
Nonlinear optical phenomena offer unique pathways for light generation and manipulation.

Purpose of the Study:

To demonstrate a novel near-field imaging and spectroscopy technique.
To utilize the nonlinear optical response of a gold nanoparticle dimer as a localized excitation source.
To enable high-resolution fluorescence and extinction imaging.

Main Methods:

Employing a gold nanoparticle pair as a nonlinear optical antenna.
Using femtosecond laser pulses at frequencies omega(1) and omega(2) to induce four-wave mixing (4WM).
Utilizing the generated 4WM light (2omega(1) - omega(2)) for excitation in fluorescence and extinction imaging.

Main Results:

Achieved high-resolution near-field imaging and spectroscopy.
Demonstrated localized photon emission from the nanoparticle dimer junction.
Successfully imaged fluorescent nanospheres and tubular J-aggregates using this technique.

Conclusions:

The gold nanoparticle dimer serves as an efficient, tunable nonlinear light source for imaging.
This nonlinear optical approach provides a powerful tool for nanoscale imaging and spectroscopy.
The technique shows promise for advanced material characterization at the nanoscale.