Diffractive and refractive liquid crystal devices based on multilayer matrices

Otón Martínez, Eva and Morawiak, Przemyslaw and Mazur, Rafał and Quintana Arregui, Xabier and Geday, Morten Andreas and Otón Sánchez, José Manuel and Piecek, Wiktor (2019). Diffractive and refractive liquid crystal devices based on multilayer matrices. "Journal of Lightwave Technology", v. 37 (n. 9); pp. 2086-2093. ISSN 1558-2213. https://doi.org/10.1109/JLT.2019.2898010.

Description

Title: Diffractive and refractive liquid crystal devices based on multilayer matrices
Author/s:
  • Otón Martínez, Eva
  • Morawiak, Przemyslaw
  • Mazur, Rafał
  • Quintana Arregui, Xabier
  • Geday, Morten Andreas
  • Otón Sánchez, José Manuel
  • Piecek, Wiktor
Item Type: Article
Título de Revista/Publicación: Journal of Lightwave Technology
Date: February 2019
ISSN: 1558-2213
Volume: 37
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Tecnología Fotónica y Bioingeniería
Creative Commons Licenses: None

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Abstract

Tunable photonic devices based on self-organized materials like liquid crystals are opening new alternatives for photonic applications, especially when several optical functions can be implemented into one device. Beam steering devices based on liquid crystals usually work either as digital beam steerers (phase gratings), or as analog steerers (prisms). Digital steerers move laser beams to fixed positions; they cannot be tuned continuously. Analog beam steerers produce a continuous angular deviation of laser beams but with very limited deviation angles. In this work we developed a tunable grating-prism, that can work as a prism and as a phase grating at the same time. This combination of refractive and diffractive effects is achieved with multilayer ITO electrode matrices in a liquid crystal device. This solution is completely different from previous approaches, like blaze gratings or Fresnel configurations - the tunability range here is completely continuous, or completely stepped, or a combination of both at the same time - as there are no interpixels or dead areas in the multilayer configuration. The proposed grating-prism is able to deviate a light beam to a large fixed angle by diffraction, and then fine-tune the beam over small angle ranges by refraction. Additionally, the light losses produced by ITO diffraction in conventional liquid crystal gratings are significantly reduced using the layered configuration.

More information

Item ID: 59386
DC Identifier: http://oa.upm.es/59386/
OAI Identifier: oai:oa.upm.es:59386
DOI: 10.1109/JLT.2019.2898010
Official URL: https://ieeexplore.ieee.org/document/8636910
Deposited by: Dr Eva Oton
Deposited on: 11 Mar 2020 10:51
Last Modified: 11 Mar 2020 10:51
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