Computational split-field finite-difference time-domain evaluation of simplified tilt-angle models for parallel-aligned liquid-crystal devices

Andrés Márquez; Jorge Francés; Francisco J. Martínez; Sergi Gallego; Mariela L. Álvarez; Eva M. Calzado; Inmaculada Pascual; Augusto Beléndez

doi:10.1117/1.OE.57.3.037110

24 March 2018 Computational split-field finite-difference time-domain evaluation of simplified tilt-angle models for parallel-aligned liquid-crystal devices

Andrés Márquez, Jorge Francés, Francisco J. Martínez, Sergi Gallego, Mariela L. Álvarez, Eva M. Calzado, Inmaculada Pascual, Augusto Beléndez

Author Affiliations +

Optical Engineering, Vol. 57, Issue 3, 037110 (March 2018). https://doi.org/10.1117/1.OE.57.3.037110

Abstract

Simplified analytical models with predictive capability enable simpler and faster optimization of the performance in applications of complex photonic devices. We recently demonstrated the most simplified analytical model still showing predictive capability for parallel-aligned liquid crystal on silicon (PA-LCoS) devices, which provides the voltage-dependent retardance for a very wide range of incidence angles and any wavelength in the visible. We further show that the proposed model is not only phenomenological but also physically meaningful, since two of its parameters provide the correct values for important internal properties of these devices related to the birefringence, cell gap, and director profile. Therefore, the proposed model can be used as a means to inspect internal physical properties of the cell. As an innovation, we also show the applicability of the split-field finite-difference time-domain (SF-FDTD) technique for phase-shift and retardance evaluation of PA-LCoS devices under oblique incidence. As a simplified model for PA-LCoS devices, we also consider the exact description of homogeneous birefringent slabs. However, we show that, despite its higher degree of simplification, the proposed model is more robust, providing unambiguous and physically meaningful solutions when fitting its parameters.

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Andrés Márquez, Jorge Francés, Francisco J. Martínez, Sergi Gallego, Mariela L. Álvarez, Eva M. Calzado, Inmaculada Pascual, and Augusto Beléndez "Computational split-field finite-difference time-domain evaluation of simplified tilt-angle models for parallel-aligned liquid-crystal devices," Optical Engineering 57(3), 037110 (24 March 2018). https://doi.org/10.1117/1.OE.57.3.037110

Received: 2 October 2017; Accepted: 28 February 2018; Published: 24 March 2018

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