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Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Optical encoding by plasmon-based patterning: hard and inorganic materials become photosensitive.

A Siozios¹, D C Koutsogeorgis, E Lidorikis

¹Department of Materials Science and Engineering, University of Ioannina, GR-45110 Ioannina, Greece.

|December 3, 2011

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This study reports on photosensitive aluminum nitride (AlN) nanocomposite films containing silver nanospheres. Laser annealing induces changes in the film

Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Nanocomposite aluminum nitride (AlN) films with embedded metallic nanoparticles exhibit unique optical properties.
Localized surface plasmon resonances (LSPR) in metallic nanoparticles are sensitive to their surrounding dielectric environment.

Purpose of the Study:

To investigate the photosensitivity of AlN films containing silver nanospheres.
To explore the mechanism of photoinduced modulation of LSPR in these nanocomposites.
To demonstrate the application of this phenomenon for optical data storage.

Main Methods:

Fabrication of AlN films with embedded silver nanospheres.
Laser annealing to induce photoinduced changes.
Spectroscopic analysis to characterize LSPR shifts.

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Evaluation of optical encoding capabilities.

Main Results:

Photosensitivity observed in AlN/Ag nanocomposite films.
Laser annealing caused silver nanoparticle enlargement and AlN matrix recrystallization.
Significant spectral shift of LSPR due to photoinduced refractive index changes.
Successful spectrally selective optical encoding demonstrated.

Conclusions:

The photosensitivity arises from photoinduced LSPR modulation via laser annealing.
The process enables durable, chemically inert optical data encoding.
AlN/Ag nanocomposites offer a promising platform for advanced optical storage.