Tailored optical propulsion forces for controlled transport of resonant gold nanoparticles and associated thermal convective fluid flows.
Laser material processing
Nanophotonics and plasmonics
Optical manipulation and tweezers
Journal
Light, science & applications
ISSN: 2047-7538
Titre abrégé: Light Sci Appl
Pays: England
ID NLM: 101610753
Informations de publication
Date de publication:
2020
2020
Historique:
received:
15
05
2020
revised:
15
09
2020
accepted:
10
10
2020
entrez:
2
11
2020
pubmed:
3
11
2020
medline:
3
11
2020
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 33133521
doi: 10.1038/s41377-020-00417-1
pii: 417
pmc: PMC7589520
doi:
Types de publication
Journal Article
Langues
eng
Pagination
181Informations de copyright
© The Author(s) 2020.
Déclaration de conflit d'intérêts
Conflict of interestThe authors declare that they have no conflict of interest.
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