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

Muñoz Martinez, Juan Francisco and Alcazar De Velasco Rico, Angel Manuel and Carrascosa, Mercedes (2019). Time evolution of photovoltaic fields generated by arbitrary light patterns in z-cut lithium niobate crystals: application to optoelectronic nanoparticle manipulation. "Optics Express", v. 28 (n. 12); ISSN 1094-4087. https://doi.org/10.1364/OE.389153.

Description

Title: Time evolution of photovoltaic fields generated by arbitrary light patterns in z-cut lithium niobate crystals: application to optoelectronic nanoparticle manipulation
Author/s:
  • Muñoz Martinez, Juan Francisco
  • Alcazar De Velasco Rico, Angel Manuel
  • Carrascosa, Mercedes
Item Type: Article
Event Title: Photorefractive Photonics and beyond 2019 (PR19)
Event Location: Gérardmer, Francia
Título de Revista/Publicación: Optics Express
Date: 2019
ISSN: 1094-4087
Volume: 28
Subjects:
Freetext Keywords: Optoelectronic tweezers; Photovoltaic tweezers; Bulk photovoltaic effect; Finite Element Method; FEM; Nanoparticles; Lithium niobate; Space charge field; z; cut
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Mecánica de Fluidos y Propulsión Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Currently, an optoelectronic technique for the manipulation of micro- and nanoparticles called photovoltaic tweezers (PVT) is experiencing a great development. Some applications include generation of structures of nanoparticles, droplet manipulation and liquid crystal orientation. All these applications are based on LiNbO3:Fe substrates due to the high electric fields this material is able to develop because of the bulk photovoltaic effect (BPE). In particular, z-cut crystals are preferred over x- or y-cut ones as they allow flexible 2D particle manipulation and patterning. Unfortunately, charge transport related to the BPE has been scarcely investigated in z-cut configuration. This work aims to fill this gap and shed light on the formation of the photovoltaic electric and space charge fields in z-cut LiNbO3:Fe crystals. Their time evolution and other related magnitudes relevant for particle manipulation, such as dielectrophoretic and electrophoretic potentials outside the crystal, have been studied in depth for different illumination conditions using the finite element method. It has been found that the components of the drift current perpendicular to the optical axis, usually neglected in simpler models, play an important role in the final space charge distribution. This is the main reason why the models already available in the literature are not able to properly describe the internal photovoltaic electric fields for high values of the light exposure. The results of this work should be a useful tool for designing experiments and improving the operation of PVT and other related techniques that are also based on these photovoltaic fields in z-cut crystals.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainMAT2014-57704-C3-2-RUnspecifiedUnspecifiedModelización del funcionamiento de las pinzas fotovoltaicas y del comportamiento de las estructuras generadas y sus aplicaciones
Government of SpainMAT2017-83951-RUnspecifiedUnspecifiedPinzas optoelectrónicas para la manipulación de nanopartículas y especies biológicas sobre niobato de litio, y su implementación en dispositivos optofluídicos
Universidad Politécnica de MadridRR01/2016UnspecifiedUnspecifiedUnspecified

More information

Item ID: 65055
DC Identifier: https://oa.upm.es/65055/
OAI Identifier: oai:oa.upm.es:65055
DOI: 10.1364/OE.389153
Official URL: https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-28-12-18085&id=432336
Deposited by: Memoria Investigacion
Deposited on: 20 Dec 2021 09:03
Last Modified: 20 Dec 2021 09:03
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