• Photonics Research
  • Vol. 10, Issue 12, 2734 (2022)
Nicola Pellizzi1, Alfredo Mazzulla2、3、*, Pasquale Pagliusi1、2, and Gabriella Cipparrone1、4、*
Author Affiliations
  • 1Physics Department, University of Calabria, 87036 Rende (CS), Italy
  • 2Cnr—Istituto di Nanotecnologia- sede secondaria di Rende (CS), 87036 Rende (CS), Italy
  • 3e-mail:
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    DOI: 10.1364/PRJ.466396 Cite this Article Set citation alerts
    Nicola Pellizzi, Alfredo Mazzulla, Pasquale Pagliusi, Gabriella Cipparrone. Plasmon-enhanced rotational dynamics of anisotropic core-shell polymeric-metallic microparticles[J]. Photonics Research, 2022, 10(12): 2734 Copy Citation Text show less

    Abstract

    The development of efficient and cost-effective micromachines is a challenge for applied and fundamental science, given their wide fields of usage. Light is a suitable tool to move small objects in a noncontact way, given its capabilities in exerting forces and torques. However, when complex manipulation is required, micro-objects with proper architecture could play a specific role. Here we report on the rotational dynamics of core-shell particles, with a polymeric nematic core of ellipsoidal shape capped by Au nanoparticles. They undergo a peculiar synchronous spinning and orbital motion when irradiated by a simple Gaussian beam, which originates from the coupling of the metallic nanoparticles’ optical response and the core anisotropies. The rotation capabilities are strongly enhanced when the trapping wavelength lies in the plasmonic resonance region: indeed, the spin kinetic energy reaches values two orders of magnitude larger than the one of bare microparticles. The proposed strategy brings important insights into optimizing the design of light controlled micro-objects and might benefit applications in microfluidics, microrheology, and micromachining involving rotational dynamics.
    Nicola Pellizzi, Alfredo Mazzulla, Pasquale Pagliusi, Gabriella Cipparrone. Plasmon-enhanced rotational dynamics of anisotropic core-shell polymeric-metallic microparticles[J]. Photonics Research, 2022, 10(12): 2734
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