Modal Symmetry Controlled Second-Harmonic Generation
by Propagating Plasmons
Version 2 2019-08-29, 12:35Version 2 2019-08-29, 12:35
Version 1 2019-08-29, 12:33Version 1 2019-08-29, 12:33
Posted on 2019-08-29 - 12:35
A new
concept for second-harmonic generation (SHG) in an optical
nanocircuit is proposed. We demonstrate both theoretically and experimentally
that the symmetry of an optical mode alone is sufficient to allow
SHG even in centro-symmetric structures made of centro-symmetric material.
The concept is realized using a plasmonic two-wire transmission-line
(TWTL), which simultaneously supports a symmetric and an antisymmetric
mode. We first confirm that emission of second-harmonic light into
the symmetric mode of the waveguide is symmetry-allowed when the fundamental
excited waveguide modes are either purely symmetric or antisymmetric.
We further switch the emission into the antisymmetric mode when a
controlled mixture of the fundamental modes is excited simultaneously.
Our results open up a new degree of freedom into the designs of nonlinear
optical components and should pave a new avenue toward multifunctional
nanophotonic circuitry.
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