Time evolution of photovoltaic fields generated by arbitrary light patterns in z-cut LiNbO3 :Fe: application to optoelectronic nanoparticle manipulation

Optics Express
Juan F Muñoz-MartínezM Carrascosa

Abstract

The bulk photovoltaic effect is a phenomenon that generates high electric fields in certain ferroelectric crystals under illumination, as iron doped lithium niobate (LiNbO3:Fe). A variety of innovative applications of these electric fields require using of z-cut plates, in which the polar axis is normal to the larger crystal faces. However, the kinetics and distribution of the photovoltaic fields in this configuration have not been investigated in depth. In this work, the photovoltaic charge transport of z-cut configuration is studied through a complete finite element analysis. Light patterns commonly used for particle trapping applications are used to study the temporal evolution of the electric field developed by the crystal. Results show that photovoltaic currents perpendicular to the optical axis play a key role in the development of the final charge distribution. Moreover, there is a relevant, localized charge accumulation inside the crystal which is required to reach the saturation electric field in the whole illuminated volume. The role of crystal thickness and light absorption are analysed. It has been found that they are important to determine the time evolution of the process. The simulations are expected to be a key ...Continue Reading

References

Apr 8, 2006·Optics Letters·Jennifer L CarnsDean R Evans
Feb 18, 2011·Lab on a Chip·Miles Padgett, Roberto Di Leonardo
Feb 22, 2011·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Alfonso Blázquez-CastroMercedes Carrascosa
Nov 24, 2011·Optics Express·Javier VillarroelFernando Agulló-López
Jan 15, 2016·Optics Letters·J F Muñoz-MartínezM Carrascosa
Jul 8, 2016·Scientific Reports·Lipin ChenShihao Sun
Feb 29, 2020·Optics Letters·Esmeralda Muñoz-CortésAngel García-Cabañes

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