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Plasmon-assisted optofluidics.

Jon S Donner¹, Guillaume Baffou, David McCloskey

¹ICFO - Institut de Ciènces Fotòniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.

|June 11, 2011

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Illuminated plasmonic nanostructures generate heat, inducing nanoscale fluid convection. While negligible for single nanostructures, this thermal effect becomes significant for larger structures or assemblies.

Area of Science:

Multiphysics phenomena
Nanoscale heat transfer
Fluid dynamics

Background:

Plasmonic nanostructures exhibit unique optical properties when illuminated.
Light absorption in plasmonics leads to localized heating.
Understanding nanoscale heat dissipation and its impact on surrounding fluids is crucial.

Purpose of the Study:

To investigate heat release and fluid convection induced by illuminated plasmonic structures at the nanoscale.
To develop a unified theoretical framework combining optics, thermodynamics, and hydrodynamics for this phenomenon.
To quantify the relationship between structure properties, temperature, and fluid velocity.

Main Methods:

Development of a unified theoretical formalism.
Numerical simulations of temperature and velocity fields.

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Last Updated: Jun 1, 2026

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Published on: December 10, 2011

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Published on: June 28, 2017

Analysis of a gold disk on glass illuminated at plasmon resonance.

Main Results:

Fluid velocity shows a linear dependence on structure temperature.
Fluid velocity exhibits a quadratic dependence on structure size (at constant temperature).
Negligible fluid velocity (<1 nm/s) for single nanostructures due to low Reynolds number.

Conclusions:

Thermal-induced fluid convection is significant for micrometer-sized plasmonic structures or assemblies of nanostructures.
The study provides a framework for understanding nanoscale optothermal-hydrodynamic coupling.
Potential applications in microfluidics and thermal management at the nanoscale.