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Temporal dynamics of light-written waveguides in unbiased liquid crystals

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Details

Original languageEnglish
Pages (from-to)1878-1887
Number of pages10
JournalJournal of the Optical Society of America B: Optical Physics
Volume35
Issue number8
DOIs
Publication statusPublished - 1 Aug 2018
Publication typeA1 Journal article-refereed

Abstract

The control of light by light is one of the main aims in modern photonics. In this context, a fundamental cornerstone is the realization of light-written waveguides in real time, resulting in all-optical reconfigurability of communication networks. Light-written waveguides are often associated with spatial solitons, that is, non-diffracting waves due to a nonlinear self-focusing effect in the harmonic regime. From an applicative point of view, it is important to establish the temporal dynamics for the formation of such light-written guides. Here, we investigate theoretically the temporal dynamics in nematic liquid crystals, a material where spatial solitons can be induced using continuous wave lasers with a few milliwatts of power. We fully address the role of the spatial walk-off and the longitudinal nonlocality in the waveguide formation. We show that for powers large enough to induce light self-steering the beam undergoes several fluctuations before reaching the stationary regime, in turn leading to a much longer formation time for the light-written waveguide.

Publication forum classification

Field of science, Statistics Finland