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Second-Harmonic Generation from a Quantum Emitter Coupled to a Metallic Nanoantenna
journal contribution
posted on 2020-03-09, 11:36 authored by Antton Babaze, Ruben Esteban, Javier Aizpurua, Andrei G. BorisovWe use time-dependent density functional
theory and a semiclassical
model to study second-harmonic generation in a system comprising a
quantum emitter and a spherical metallic nanoparticle, where the transition
frequency of the quantum emitter is set to be resonant with the second
harmonic of the incident frequency. The quantum emitter is shown to
enable strong second-harmonic generation, which is otherwise forbidden
because of symmetry constraints. The time-dependent density functional
theory calculations allow one to identify the main mechanism driving
this nonlinear effect, where the quantum emitter plays the role of
an optical resonator that experiences the nonlinear near fields generated
by the metallic nanoantenna located nearby. The influence of the intrinsic
properties of the quantum emitter and the nanoantenna, together with
the relative position of both in the coupled system, allows for a
high degree of control of the nonlinear light emission. The main effects
and contributions to this nonlinear process can be correctly captured
by a semiclassical description developed in this work.