
Facultad de Ciencias Físicas, Ciudad Universitaria s/n, Universidad Complutense de Madrid, 28040 Madrid, Spain
José A. Rodrigo (jarmar@fis.ucm.es)
Published:2020,
Published Online:27 October 2020,
Received:15 May 2020,
Revised:15 September 2020,
Accepted:10 October 2020
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Rodrigo, J. A., Angulo, M. & Alieva, T. Tailored optical propulsion forces for controlled transport of resonant gold nanoparticles and associated thermal convective fluid flows. Light: Science & Applications, 9, 1897-1907 (2020).
Rodrigo, J. A., Angulo, M. & Alieva, T. Tailored optical propulsion forces for controlled transport of resonant gold nanoparticles and associated thermal convective fluid flows. Light: Science & Applications, 9, 1897-1907 (2020). DOI: 10.1038/s41377-020-00417-1.
Noble metal nanoparticles illuminated at their plasmonic resonance wavelength turn into heat nanosources. This phenomenon has prompted the development of numerous applications in science and technology. Simultaneous optical manipulation of such resonant nanoparticles could certainly extend the functionality and potential applications of optothermal tools. In this article
we experimentally demonstrate optical transport of single and multiple resonant nanoparticles (colloidal gold spheres of radius 200 nm) directed by tailored transverse phase-gradient forces propelling them around a 2D optical trap. We show how the phase-gradient force can be designed to efficiently change the speed of the nanoparticles. We have found that multiple hot nanoparticles assemble in the form of a quasi-stable group whose motion around the laser trap is also controlled by such optical propulsion forces. This assembly experiences a significant increase in the local temperature
which creates an optothermal convective fluid flow dragging tracer particles into the assembly. Thus
the created assembly is a moving heat source controlled by the propulsion force
enabling indirect control of fluid flows as a micro-optofluidic tool. The existence of these flows
probably caused by the temperature-induced Marangoni effect at the liquid water/superheated water interface
is confirmed by tracking free tracer particles migrating towards the assembly. We propose a straightforward method to control the assembly size
and therefore its temperature
by using a nonuniform optical propelling force that induces the splitting or merging of the group of nanoparticles. We envision further development of microscale optofluidic tools based on these achievements.
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