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Updated: Dec 23, 2025

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Published on: January 3, 2016

Negative Effective Mass in Plasmonic Systems.

Edward Bormashenko¹, Irina Legchenkova¹

¹Department of Chemical Engineering, Ariel University, Ariel 407000, Israel.

Materials (Basel, Switzerland)

|April 23, 2020

Summary

This summary is machine-generated.

Researchers demonstrate negative effective mass metamaterials using electro-mechanical coupling and plasma oscillations. This phenomenon occurs when a metallic particle

Keywords:

low frequency plasmons metamaterials negative effective mass plasma oscillations

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Area of Science:

Condensed Matter Physics
Metamaterials Science
Nanotechnology

Background:

Negative effective mass is a counterintuitive property with potential applications in advanced materials.
Metamaterials offer unique electromagnetic and mechanical properties not found in natural materials.

Purpose of the Study:

To theoretically demonstrate negative effective mass in metamaterials through electro-mechanical coupling.
To explore the role of plasma oscillations in achieving negative mass properties.

Main Methods:

Utilizing electro-mechanical coupling to link mechanical vibrations with electron gas plasma oscillations.
Modeling the effective mass of a metallic particle subjected to external frequencies near plasma frequency.
Applying the concept to specific conducting metals like Gold (Au) and Lithium (Li).

Main Results:

The effective mass of a metallic particle becomes negative when its vibration frequency approaches the plasma oscillation frequency from above.
The derived formula for effective mass, m_eff = m1 + m2 * (ωp^2 / (ωp^2 - ω^2)), quantifies this negative mass regime.
The phenomenon is theoretically supported by calculations involving plasma oscillations (ωp) and external frequencies (ω).

Conclusions:

Electro-mechanical coupling provides a viable pathway to engineer metamaterials with negative effective mass.
Plasma oscillations of free electron gas are crucial for achieving this negative mass effect.
The findings open possibilities for novel metamaterial applications leveraging negative mass properties.