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A hybrid trans-modal liquid crystal optical vortex generator

Abstract: This work experimentally validates a large-aperture optical vortex generator using a novel hybrid structure, combining transmission electrode and modal techniques, in what we term the trans-modal technique. The continuous transmission electrode is designed to generate a linear voltage distribution between the contact electrodes, while the electrode stubs distribute the voltage across the active area. A high-resistivity layer of the conducting polymer PEDOT fills the gap between the electrodes, resulting in a completely continuous voltage distribution. A 1-cm aperture device is experimentally demonstrated, but the structure is completely scalable. Theoretical results validate the design, and experimental results demonstrate precise control over the topological charge for both positive and negative values of orbital angular momentum. Remarkably, the conversion efficiency for the first topological charges is almost 100%. The reduction in efficiency of the higher-order modes has been explained theoretically, and it is not caused by design but by the PEDOT characteristics. The fabrication process is straightforward, as the high-resistivity layer may also be inhomogeneous. This work contributes significantly to the field by introducing a novel method for optical vortex generation. The simplicity of the fabrication process, high conversion efficiency, and ability to control the topological charge make this technique a promising avenue for future research and applications.

 Autoría: Walewska A., Bennis N., Jankowski T., Morawiak P., Zografopoulos D.C., Filipiak M., Slowikowski M., Cobo A., Algorri J.F.,

 Fuente: Optics and Laser Technology, 2025, 181(B), 111849

 Editorial: Elsevier

 Fecha de publicación: 01/02/2025

 Nº de páginas: 8

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.optlastec.2024.111849

 ISSN: 0030-3992

 Proyecto español: TED2021-130378B-C21

 Url de la publicación: https://doi.org/10.1016/j.optlastec.2024.111849

Autoría

WALEWSKA, ALEKSANDRA

BENNIS, NOUREDDINE

JANKOWSKI, TOMASZ

MORAWIAK, PRZEMEK

ZOGRAFOPOULOS, DIMITRIOS C.

FILIPIAK, MACIEJ

SLOWIKOWSKI, MATEUSZ