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Layered silver nanoparticles embedded in a BaF(2) matrix: optical characterization.

Maria L Protopapa¹, Antonella Rizzo, Marilena Re

¹Department of Advanced Physical Technologies and New Materials, Italian National Agency for New Technologies,Energy and the Environment (ENEA), CR Brindisi, S.S. 7 Appia, 72100 Brindisi, Italy. lucia.protopapa@enea.it

|December 17, 2009

Summary

Researchers created silver nanoclusters within a barium fluoride matrix for optical applications. They monitored surface plasmon resonance to characterize these nanostructured optical coatings.

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Multilayer stacks of silver (Ag) and barium fluoride (BaF2) were fabricated on silica substrates.
The goal was to create Ag nanoclusters embedded within an insulating BaF2 matrix.
Such nanostructured materials have potential applications in optical coatings, like antireflection layers.

Purpose of the Study:

To investigate the optical properties of Ag nanoclusters within a BaF2 dielectric matrix.
To address the challenge of characterizing nanostructured optical coatings containing metallic nanoparticles.
To monitor and fit the surface plasmon resonance (SPR) peak in optical absorption spectra.

Main Methods:

Fabrication of alternating Ag (approx. 1.2 nm) and BaF2 (approx. 25 nm) layers via thermal evaporation.

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Thermal annealing treatment at 500°C for 1 hour to form Ag nanoclusters.

Optical absorption spectroscopy to observe SPR peaks and fitting using a modified Maxwell-Garnett effective medium theory.

Main Results:

Formation of Ag nanoclusters within the BaF2 matrix was confirmed by the appearance of SPR peaks.
The optical absorption spectra were successfully fitted using a theoretical model accounting for particle shape and arrangement.
This demonstrates a method for characterizing the optical properties of such nanostructured materials.

Conclusions:

The study successfully characterized Ag nanoclusters in a BaF2 matrix using optical absorption spectroscopy and theoretical modeling.
The employed model, based on Maxwell-Garnett theory, effectively captures the optical response influenced by nanocluster morphology.
This work contributes to understanding and designing nanostructured optical coatings for advanced optical applications.