Determining intrinsic potentials and validating optical binding forces between colloidal particles using optical tweezers

Chi Zhang (), José Muñetón Díaz, Augustin Muster, Diego R. Abujetas, Luis S. Froufe-Pérez and Frank Scheffold ()
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Chi Zhang: University of Fribourg
José Muñetón Díaz: University of Fribourg
Augustin Muster: University of Fribourg
Diego R. Abujetas: University of Fribourg
Luis S. Froufe-Pérez: University of Fribourg
Frank Scheffold: University of Fribourg

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Understanding the interactions between small, submicrometer-sized colloidal particles is crucial for numerous scientific disciplines and technological applications. In this study, we employ optical tweezers as a powerful tool to investigate these interactions. We utilize a full image reconstruction technique to achieve high precision in characterizing particle pairs that enable nanometer-scale measurement of their positions. This approach captures intricate details and provides a comprehensive understanding of the spatial arrangement between particles, overcoming previous limitations in resolution. Moreover, our research demonstrates that properly accounting for optical binding forces to determine the intrinsic interaction potential is vital. We employ a discrete dipole approximation approach to calculate optical binding potentials and achieve a good agreement between the calculated and observed binding forces. We incorporate the findings from these simulations into the assessment of the intrinsic interaction potentials and validate our methodology by using short-range depletion attraction induced by micelles as an example.

Date: 2024
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DOI: 10.1038/s41467-024-45162-w

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