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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Published on: May 28, 2016

Charge-tunable quantum plasmons in colloidal semiconductor nanocrystals.

Alina M Schimpf¹, Niket Thakkar, Carolyn E Gunthardt

¹Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States.

|December 24, 2013

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Quantum plasmons were discovered in doped semiconductor nanocrystals, challenging the classical Drude model. This finding reveals a closer link between plasmon resonances and electron transitions in semiconductors compared to metals.

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Plasmonic nanostructures are crucial for sensing, photonics, and catalysis.
Doped semiconductor nanocrystals offer tunable carrier densities for plasmonic applications.
Classical Drude model is typically used to analyze plasmon resonances in these materials.

Purpose of the Study:

To investigate the plasmon resonance energies in doped semiconductor nanocrystals.
To determine if classical models accurately describe plasmon behavior in these nanomaterials.
To explore the fundamental differences between plasmonics in semiconductors and metals.

Main Methods:

Fabrication of size-controlled, photodoped ZnO nanocrystals.
Experimental measurement of plasmon resonance energies.

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Analysis using classical Drude model and Lorentz oscillator model.

Main Results:

Experimental plasmon resonance energies deviated from classical Drude model predictions for small nanocrystal sizes.
Quantum plasmons were identified in ZnO nanocrystals.
Lorentz oscillator model provided a better fit to the experimental data.

Conclusions:

Classical Drude model is insufficient for describing plasmon resonances in small semiconductor nanocrystals.
Quantum effects become significant in small-sized plasmonic semiconductor nanocrystals.
A stronger correlation exists between plasmon resonances and single-electron transitions in semiconductors than in metals.