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Issue 38, 2019
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Plasmon-mediated discrete diffraction behaviour of an array of responsive waveguides

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Abstract

We investigate the discrete diffraction phenomenon in a Polymer-Liquid Crystal-Polymer Slices (POLICRYPS) overlaying a random distribution of gold nanoparticles (AuNPs, plasmonic elements). We study the propagation of a CW green laser beam through the waveguide structure as a function of beam polarization, laser intensity and sample temperature. It turns out that the plasmonic field created at the interface between AuNPs and POLICRYPS waveguides enables and stabilizes the optical field propagation within the responsive nematic liquid crystal channels. The active role of the liquid crystal is pointed out by a polarization, temperature and beam divergence experimental analysis and evidenced by a peculiar trumpet-shaped discrete diffraction pattern. Theoretical simulations confirm that the observed optical behavior is governed by the interaction of the nematic liquid crystal with optical and plasmonic fields.

Graphical abstract: Plasmon-mediated discrete diffraction behaviour of an array of responsive waveguides

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Publication details

The article was received on 11 Aug 2019, accepted on 17 Sep 2019 and first published on 18 Sep 2019


Article type: Paper
DOI: 10.1039/C9NR06917H
Nanoscale, 2019,11, 17931-17938

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    Plasmon-mediated discrete diffraction behaviour of an array of responsive waveguides

    L. Pezzi, L. De Sio, A. Veltri, A. Cunningham, A. De Luca, T. Büergi, C. Umeton and R. Caputo, Nanoscale, 2019, 11, 17931
    DOI: 10.1039/C9NR06917H

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