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Optical harmonic generation from periodically arrayed hexagonal structure of silver nanoparticles.

Chih-Chiang Ho¹, Yi-Chen Yeh, Juh Tzeng Lue

¹Department of Electrical Engineering, National Tsing Hua University Hsin Chu 30042, Taiwan.

Journal of Nanoscience and Nanotechnology

|November 26, 2009

Summary

Researchers created hexagonal nano-silver clusters using a self-assembly method. This structure significantly enhanced optical second-harmonic generation compared to uniform films, attributed to Bragg wave vectors.

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Periodic nanostructures offer unique optical properties.
Controlling nanoparticle arrangement is key to enhancing nonlinear optical effects.

Purpose of the Study:

To fabricate close-packed hexagonal nano-silver clusters.
To investigate the enhancement of optical second-harmonic susceptibility in these structures.

Main Methods:

Self-assembled fabrication of nano-silver clusters on polystyrene micro-spheres.
Deposition of silver films and subsequent lift-off of micro-spheres.
Measurement of optical second-harmonic susceptibility.

Main Results:

Successfully fabricated hexagonal close-packed nano-silver clusters.

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Observed several-fold enhancement in second-harmonic generation intensity compared to uniform silver films.

Attributed enhancement to quasi-phase matching conditions from Bragg wave vectors.

Conclusions:

Periodic arrangement of nano-silver particles significantly boosts optical second-harmonic generation.
The self-assembly method provides a viable route for creating advanced photonic materials.
Understanding quasi-phase matching is crucial for optimizing nonlinear optical responses.