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Optical control of topological end states via soliton formation in a 1D lattice
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DOI：10.1515/nanoph-2024-0401.png)
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Abstract
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Discrete spatial solitons are self-consistent solutions of the discrete nonlinear Schr & ouml;dinger equation that maintain their shape during propagation. Here we show, using a pump-probe technique, that soliton formation can be used to optically induce and control a linear topological end state in the bulk of a Su-Schrieffer-Heeger lattice, using evanescently-coupled waveguide arrays. Specifically, we observe an abrupt nonlinearly-induced transition above a certain power threshold due to an inversion symmetry-breaking nonlinear bifurcation. Our results demonstrate all-optical active control of topological states.
Keywords:
discrete spatial solitons
topological photonics
pump-probe
Kerr-nonlinearity
waveguide lattices
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