Vector analysis of the space-charge field in nonconventionally biased photorefractive crystals

Crognale, C.; Rosa, L.

doi:10.1109/jlt.2005.849935

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…Will new phenomena appear during soliton formations and their interactions? Recently, space charge fields in nonconventionally biased photorefractive crystals have been numerically analyzed by Crognale and Rosa [9]. In this paper, we theoretically predict and experimentally demonstrate the existence of two-dimensional (2-D) bright elliptical solitons in a nonconventionally biased strontium barium niobate (SBN) crystal.…”

Section: Introductionmentioning

confidence: 94%

Elliptical solitons in nonconventionally biased photorefractive crystals

Zhang¹,

Zhao²,

Lou³

et al. 2007

Opt. Express

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We theoretically predict and experimentally observe the two-dimensional (2-D) bright solitons in a nonconventionally biased strontium barium niobate (SBN) crystal. A theory describing light propagating in an SBN crystal with a bias field along an arbitrary direction is formulated. Then the existence of 2-D bright solitons in such a crystal is numerically verified. By employing digital holography, the index changes induced by Gaussian beams in an SBN crystal under different biasing conditions are visualized. Finally, skewed elliptical solitons are experimentally demonstrated.

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Section: Introductionmentioning

confidence: 94%

Elliptical solitons in nonconventionally biased photorefractive crystals

Zhang¹,

Zhao²,

Lou³

et al. 2007

Opt. Express

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“…By solving Equation (2), the space-charge field produced in LiNbO 3 by laser illumination can be calculated [34]. The charge-distribution created in the region illuminated by the laser beam is the sum of several contributions: diffusion, photovoltaic and drift current [35], which in our case is negligible due to the absence of an external electric field.…”

Section: Photorefractive Field and Dep Force In Lithium Niobatementioning

confidence: 99%

Numerical and Experimental Study of Optoelectronic Trapping on Iron-Doped Lithium Niobate Substrate

et al. 2016

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Optoelectronic tweezers (OET) are a promising technique for the realization of reconfigurable systems suitable to trap and manipulate microparticles. In particular, dielectrophoretic (DEP) forces produced by OET represent a valid alternative to micro-fabricated metal electrodes, as strong and spatially reconfigurable electrical fields can be induced in a photoconductive layer by means of light-driven phenomena. In this paper we report, and compare with the experimental data, the results obtained by analyzing the spatial configurations of the DEP-forces produced by a 532 nm laser beam, with Gaussian intensity distribution, impinging on a Fe-doped Lithium Niobate substrate. Furthermore, we also present a promising preliminary result for water-droplets trapping, which could open the way to the application of this technique to biological samples manipulation.

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“…From the purely nonlinear perspective, i.e., in the writing phase, effects resulting from the interaction of different polarization states have been predicted in Ref. [10], whereas a recent effort has been dedicated to the study of effects of unconventional bias field directions [11,12], a geometry that can equally activate polarization change.…”

Section: Introductionmentioning

confidence: 99%

Separating polarization components through the electro-optic read-out of photorefractive solitons

Pierangelo¹,

DelRe²,

Ciattoni³

et al. 2007

Opt. Express

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Analyzing the propagation dynamics of a light beam of arbitrary linear input polarization in an electro-activated photorefractive soliton we are able to experimentally find the conditions that separate its linear polarization components, mapping them into spatially distinct regions at the crystal output. Extending experiments to the switching scheme based on two oppositely biased solitons, we are able to transform this spatial separation into a separation of two distinct guided modes. The result is a miniaturized electro-optic polarization separator.

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Vector analysis of the space-charge field in nonconventionally biased photorefractive crystals

Cited by 5 publications

References 20 publications

Elliptical solitons in nonconventionally biased photorefractive crystals

Elliptical solitons in nonconventionally biased photorefractive crystals

Numerical and Experimental Study of Optoelectronic Trapping on Iron-Doped Lithium Niobate Substrate

Separating polarization components through the electro-optic read-out of photorefractive solitons

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