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Colloidal crystal formation using optothermal forces
Author(s): J. Ramírez-Ramírez Sr.; J. Vazquez-Lozano; H. Peregrina-Barreto; R. Ramos-García
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Paper Abstract

We show that colloidal crystals can be assembled by means of temperature gradients produced by light absorption (λ=1070 nm) in a 21 nm titanium thin film deposited on one of the cell´s walls. Depending on the position of a 100x microscope objective focus within the 20 μm thick cell, three different regimes of crystal formation can be identified: 1) convective currents regime; 2) convective-thermophoresis regime, and 3) thermophoresis regime. We show that defects on the crystal can be modified dynamically by switching on and off the laser beam. In addition, the crystal can be 2D manipulated along the substrate. This technique could lead to the formation of large area colloidal crystals for photonics applications.

Paper Details

Date Published: 9 September 2019
PDF: 7 pages
Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110832H (9 September 2019); doi: 10.1117/12.2530312
Show Author Affiliations
J. Ramírez-Ramírez Sr., Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
J. Vazquez-Lozano, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
H. Peregrina-Barreto, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
R. Ramos-García, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)


Published in SPIE Proceedings Vol. 11083:
Optical Trapping and Optical Micromanipulation XVI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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