Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 10, 2015
|
|
---|---|---|
Article Number | 15026 | |
Number of page(s) | 7 | |
DOI | https://doi.org/10.2971/jeos.2015.15026 | |
Published online | 21 May 2015 |
Regular paper
Comparative theoretical analysis between parallel and perpendicular geometries for 2D particle patterning in photovoltaic ferroelectric substrates
1
Dep. Mecánica de Fluidos y Propulsión Aeroespacial, Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros 3, 28040 Madrid, Spain
2
Dep. Física de Materiales, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
Received:
19
January
2015
Revised:
1
April
2015
This paper describes the dielectrophoretic potential created by the evanescent electric field acting on a particle near a photovoltaic crystal surface depending on the crystal cut. This electric field is obtained from the steady state solution of the Kukhtarev equations for the photovoltaic effect, where the diffusion term has been disregarded. First, the space charge field generated by a small, square, light spot where d ≪ l (being d a side of the square and l the crystal thickness) is studied. The surface charge density generated in both geometries is calculated and compared as their relation determines the different properties of the dielectrophoretic potential for both cuts. The shape of the dielectrophoretic potential is obtained and compared for several distances to the sample. Afterwards other light patterns are studied by the superposition of square spots, and the resulting trapping profiles are analysed. Finally the surface charge densities and trapping profiles for different d/l relations are studied.
Key words: Optoelectronic tweezers / photovoltaic tweezers / particle trapping / dielectrophoresis / nanoparticles
© The Author(s) 2015. All rights reserved.
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