The application of evanescent photovoltaic (PV) fields, generated by visible illumination of Fe:LiNbO3 substrates, for parallel massive trapping and manipulation of micro- and nano-objects is critically reviewed. The technique has been often referred to as photovoltaic or photorefractive tweezers. The main advantage of the new method is that the involved electrophoretic and/or dielectrophoretic forces do not require any electrodes and large scale manipulation of nano-objects can be easily achieved using the patterning capabilities of light. The paper describes the experimental techniques for particle trapping and the main reported experimental results obtained with a variety of micro- and nano-particles (dielectric and conductive) and different illumination configurations (single beam, holographic geometry, and spatial light modulator projection). The report also pays attention to the physical basis of the method, namely, the coupling of the evanescent photorefractive fields to the dielectric response of the nano-particles. The role of a number of physical parameters such as the contrast and spatial periodicities of the illumination pattern or the particle deposition method is discussed. Moreover, the main properties of the obtained particle patterns in relation to potential applications are summarized, and first demonstrations reviewed. Finally, the PV method is discussed in comparison to other patterning strategies, such as those based on the pyroelectric response and the electric fields associated to domain poling of ferroelectric materials.
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December 2015
Review Article|
October 20 2015
LiNbO3: A photovoltaic substrate for massive parallel manipulation and patterning of nano-objects
M. Carrascosa;
M. Carrascosa
1Dept. Física de Materiales,
Universidad Autónoma de Madrid
, Madrid 28049, Spain
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A. García-Cabañes;
A. García-Cabañes
1Dept. Física de Materiales,
Universidad Autónoma de Madrid
, Madrid 28049, Spain
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M. Jubera;
M. Jubera
1Dept. Física de Materiales,
Universidad Autónoma de Madrid
, Madrid 28049, Spain
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J. B. Ramiro;
J. B. Ramiro
2Dept. Mecánica de Fluidos y Propulsión Aeroespacial,
Universidad Politécnica de Madrid
, Madrid 28040, Spain
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F. Agulló-López
F. Agulló-López
3Centro de Microanálisis de Materiales (CMAM),
Universidad Autónoma de Madrid
, Madrid 28049, Spain
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Appl. Phys. Rev. 2, 040605 (2015)
Article history
Received:
April 17 2015
Accepted:
July 21 2015
Citation
M. Carrascosa, A. García-Cabañes, M. Jubera, J. B. Ramiro, F. Agulló-López; LiNbO3: A photovoltaic substrate for massive parallel manipulation and patterning of nano-objects. Appl. Phys. Rev. 1 December 2015; 2 (4): 040605. https://doi.org/10.1063/1.4929374
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