Trapping of dielectric microparticles on iron-doped lithium niobate crystal by optical Bessel beam-induced space-charge field

Lusine M. Tsarukyan; Anahit M. Badalyan; Ruben K. Hovsepyan; Rafael Kh. Drampyan

doi:10.1117/12.2553060

1 April 2020 Trapping of dielectric microparticles on iron-doped lithium niobate crystal by optical Bessel beam-induced space-charge field

Lusine M. Tsarukyan, Anahit M. Badalyan, Ruben K. Hovsepyan, Rafael Kh. Drampyan

Author Affiliations +

Proceedings Volume 11367, Photosensitive Materials and their Applications; 113671B (2020) https://doi.org/10.1117/12.2553060
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

We report the trapping of dielectric micro-particles of CaCO₃ via dielectrophoretic forces on the surface of Fe doped LiNbO₃ (LN:Fe) crystal with recorded volume holographic grating which provides quasi-periodic space-charge electric field distribution on the crystal surface. The non-diffracting Bessel beam approach was used for optical induction of holographic grating by 20÷40 mW power Bessel beam at 532 nm wavelength in photorefractive Y-cut LN:Fe crystal providing the Bessel lattice periodicity of ~40 m and hologram size on the crystal surface of 4 mm. This approach provides the induction of high contrast 2D periodic distribution of electric field on the crystal surface and high quality 2D patterning of microparticles. The particles are trapped on the crystal surface in the areas of refractive index maxima of the Bessel lattice. The physical model was developed to explain the experimental results. The photovoltaic approach of trapping and manipulation of micro- and nanoparticles is promising for applications in photonics, integrated optics and biotechnology.

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Lusine M. Tsarukyan, Anahit M. Badalyan, Ruben K. Hovsepyan, and Rafael Kh. Drampyan "Trapping of dielectric microparticles on iron-doped lithium niobate crystal by optical Bessel beam-induced space-charge field", Proc. SPIE 11367, Photosensitive Materials and their Applications, 113671B (1 April 2020); https://doi.org/10.1117/12.2553060

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