Optothermal pulling, trapping, and assembly of colloids using nanowire plasmons
| Autor: | Sunny Tiwari, G. V. Pavan Kumar, RK Sahu, Vijayakumar Chikkadi, Vandana Sharma, Diptabrata Paul |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Nanowire FOS: Physical sciences Physics::Optics Trapping Applied Physics (physics.app-ph) Condensed Matter - Soft Condensed Matter Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Soft matter Plasmon Condensed Matter - Mesoscale and Nanoscale Physics business.industry Fluid Dynamics (physics.flu-dyn) General Chemistry Physics - Applied Physics Physics - Fluid Dynamics Condensed Matter Physics Polarization (waves) Surface plasmon polariton Active matter Condensed Matter::Soft Condensed Matter Optoelectronics Soft Condensed Matter (cond-mat.soft) business Excitation Optics (physics.optics) Physics - Optics |
| Popis: | Optical excitation of colloids can be harnessed to realize soft matter systems that are out of equilibrium. In this paper, we present our experimental studies on the dynamics of silica colloids in the vicinity of a silver nanowire propagating surface plasmon polaritons (SPPs). Due to the optothermal interaction, the colloids are directionally pulled towards the excitation point of the nanowire. Having reached this point, they are spatio-temporally trapped around the excitation location. By increasing the concentration of colloids in the system, we observe multi-particle assembly around the nanowire. This process is thermophoretically driven and assisted by the SPPs. Furthermore, we find such an assembly to be sensitive to the excitation polarization at the input of the nanowire. Numerically-simulated temperature distribution around an illuminated nanowire corroborates sensitivity to the excitation polarization. Our study will find relevance in exploration of SPP-assisted optothermal pulling, trapping and assembly of colloids, and can serve as a test-bed of plasmon-driven active matter. |
| Databáze: | OpenAIRE |
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