Issue 19, 2017

Enhanced second harmonic generation in individual barium titanate nanoparticles driven by Mie resonances

Abstract

Although previous designs of nonlinear optical (NLO) nanostructures have focused on photonic crystals and metal plasmonic nanostructures, complex structures, large ohmic loss, and Joule heating greatly hinder their practical applications. Beyond photonic crystals and metal plasmonic nanostructures, all-dielectric materials (ADMs) offer new ways to generate NLO behavior at subwavelength scales. Herein, we report enhancement in the tunable second harmonic generation (SHG) reflected from individual mid-refractive ADM nanoparticles, BaTiO3 nanoparticles (BTO NPs). Multipole decomposition, as observed in the linear spectra, demonstrated that the SHG enhancement originated from an overlap between the magnetic dipole or quadrupole resonance and the second harmonic wavelength of the pump source. In the vicinity of magnetic resonances, the localized field inside the nanoparticles could be increased by more than one order of magnitude. Compared with the spectral-separated electric and magnetic resonances in high-refractive all-dielectric nanostructures, an overlap of resonances was observed in the mid-refractive all-dielectric nanostructures and it resulted in electromagnetic (EM) mode coupling. A broad spectral characteristic results in moderate EM field enhancements over a wide wavelength range, which is conducive to the tunability of the SHG responses. Our study revealed the relationship between the linear and nonlinear optics at the nanoscale and helped in the design of efficient nonlinear optical devices based on ADMs.

Graphical abstract: Enhanced second harmonic generation in individual barium titanate nanoparticles driven by Mie resonances

Supplementary files

Article information

Article type
Paper
Submitted
13 Feb 2017
Accepted
21 Apr 2017
First published
22 Apr 2017

J. Mater. Chem. C, 2017,5, 4810-4819

Enhanced second harmonic generation in individual barium titanate nanoparticles driven by Mie resonances

C. Ma, J. Yan, Y. Wei, P. Liu and G. Yang, J. Mater. Chem. C, 2017, 5, 4810 DOI: 10.1039/C7TC00650K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements