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Harmonic Nanoparticles for Regenerative Research

Harmonic Nanoparticles for Regenerative Research

Published on: May 1, 2014

Surface area-dependent second harmonic generation from silver nanorods.

Hoang Minh Ngo¹, Thanh Tuyen Luong¹, Isabelle Ledoux-Rak¹

¹Laboratoire de Photonique Quantique et Moléculaire, UMR 8537, Ecole Normale Supérieure de Cachan, CentraleSupélec, CNRS, Université Paris-Saclay, 94235 Cachan, France. ledoux@lpqm.ens-cachan.fr.

Physical Chemistry Chemical Physics : PCCP

|August 9, 2016

Summary

Silver nanorods (AgNRs) exhibit tunable nonlinear optical (NLO) properties dependent on their surface area. A novel synthesis method yields AgNRs with controlled aspect ratios for photonics applications.

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Area of Science:

Materials Science
Nanotechnology
Photonics

Background:

Nonlinear optical (NLO) properties of metallic nanoparticles are crucial for photonics.
Gold nanorods are well-studied, but alternative noble metals like silver offer potential for novel NLO applications.

Purpose of the Study:

To synthesize silver nanorods (AgNRs) with controllable localized surface plasmon resonance.
To characterize the quadratic NLO properties of AgNRs with varying aspect ratios.

Main Methods:

A one-step, seedless synthesis method using polyvinylpyrrolidone (PVP) as a capping agent.
Characterization of AgNRs with aspect ratios ranging from 5.0 to 9.7.
Second-harmonic light scattering (HLS) at 1064 nm to measure NLO properties.

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Main Results:

Successfully synthesized AgNRs with tunable aspect ratios.
Demonstrated that the hyperpolarizability (β) of AgNRs is strongly dependent on their surface area.
Established a correlation between AgNR dimensions and their NLO response.

Conclusions:

Silver nanorods are promising NLO materials for photonic devices.
The developed synthesis method offers a facile route to tailor AgNR properties.
Surface area is a key factor governing the NLO performance of AgNRs.