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Proceedings Paper

Light-driven selective assembly and healing of optical matter (Conference Presentation)
Author(s): Fan Nan; Zijie Yan

Paper Abstract

A system far from thermodynamic equilibrium is usually disordered yet ordered dissipative structures can still spontaneous form under certain conditions.1-2 The optical field provides a steady energy supply and enables a non-equilibrium dissipative state, where disorder-to-order transition occurs under anisotropic electrodynamic interactions. We find that a large number of Ag nanoparticles illuminated by a linearly polarized laser beam could self-assemble into partially ordered arrays, but they exhibited frequent structure transition between dimer chains and hexagonal nanoparticle lattices.3 In order to selective assembly of ordered lattice structures or dimer chains, a single Ag nanowire is illuminated to create a 3D interferometric optical field.4 The nanowire-guided self-assembly can be controlled by tuning the direction of linear polarization relative to the long-axis of a nanowire. The plasmonic nanowire can enhance the optical binding of nanoparticles both along and perpendicular to the laser polarization when the polarization is aligned at a specific angle. On the other hand, when specific dimer chains are perturbed and destabilized by another laser, their structures can self-heal after the perturbation is removed. Our observations suggest that light-driven self-organization of metal nanoparticles with strong optical binding interactions will provide new opportunities to discover new dissipative structures and build novel reconfigurable artificial nanostructures at mesoscale.

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 1108326 (9 September 2019);
Show Author Affiliations
Fan Nan, The Univ. of North Carolina at Chapel Hill (United States)
Zijie Yan, The Univ. of North Carolina at Chapel Hill (United States)


Published in SPIE Proceedings Vol. 11083:
Optical Trapping and Optical Micromanipulation XVI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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