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Related Experiment Video

Updated: May 23, 2026

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination

Published on: August 18, 2020

Light-controlled plasmon switching using hybrid metal-semiconductor nanostructures.

Hari P Paudel¹, Michael N Leuenberger

¹NanoScience Technology Center and Department of Physics, University of Central Florida, 12424 Research Parkway Suite 400, Orlando, Florida 32826, United States.

|April 5, 2012

Summary

We demonstrate dynamic control of plasmon resonance frequencies in silver-titanium dioxide nanoshells. A pump laser induces electron-hole pairs, causing a blue shift in plasmon frequency for light-controlled switching applications.

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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

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Published on: May 28, 2016

Area of Science:

Nanophotonics
Materials Science
Optoelectronics

Background:

Surface plasmon resonance (SPR) in metal nanoparticles is sensitive to their dielectric environment.
Controlling SPR frequencies dynamically is crucial for advanced optical devices.
Hybrid metal-semiconductor nanostructures offer tunable optical properties.

Purpose of the Study:

To demonstrate dynamic control of plasmon resonance frequencies in a hybrid Ag/TiO(2) nanoshell structure.
To investigate the effect of photo-induced electron-hole pairs on plasmon resonance.
To develop a model for a light-controlled surface plasmon polariton switch.

Main Methods:

Fabrication of hybrid silver (Ag) core and titanium dioxide (TiO(2)) shell nanoshells.
Utilizing a pump laser pulse to generate transient electron-hole pairs in the TiO(2) layer.
Measuring the shift in plasmon resonance frequency as a function of photo-induced carrier density.
Calculating the plasmon resonance shift magnitude and wavelength dependence.

Main Results:

Achieved dynamic control over plasmon resonance frequencies by modulating the dielectric function of TiO(2).
Observed a blue shift in the Ag surface plasmon frequency due to photo-induced electron-hole pairs.
Obtained significant plasmon resonance shifts up to 126 nm around 460 nm wavelength.
Demonstrated that TiO(2)'s band gap energy prevents simultaneous excitation of surface plasmons and electron-hole pairs.

Conclusions:

Proof of concept for light-tunable plasmon resonance in Ag/TiO(2) nanoshells.
The developed method enables dynamic modulation of optical properties.
The findings pave the way for novel light-controlled optical switches and devices.