Bismuth Ferrite Dielectric Nanoparticles Excited at Telecom Wavelengths as Multicolor Sources by Second, Third, and Fourth Harmonic Generation

TL;DR

This paper demonstrates that Bismuth Ferrite nanoparticles can generate multiple harmonic signals simultaneously when excited by a telecom laser, enabling multicolor light sources with controllable properties.

Contribution

It is the first to show simultaneous second, third, and fourth harmonic generation in a single dielectric nanoparticle with polarization control.

Findings

Successful generation of multiple harmonics at telecom wavelengths

Polarization controls the relative intensity of generated harmonics

Characterization of nonlinear optical responses of Bismuth Ferrite nanoparticles

Abstract

We demonstrate the simultaneous generation of second, third, and fourth harmonic from a single dielectric Bismuth Ferrite nanoparticle excited by a telecom fiber laser at 1560 nm. We first characterize the signals associated with different nonlinear orders in terms of spectrum, excitation intensity dependence, and relative signal strengths. Successively, on the basis of the polarization-resolved emission curves of the three harmonics, we discuss the interplay of susceptibility tensor components at the different orders and we show how polarization can be used as an optical handle to control the relative frequency conversion properties.