Dr. Fan Nan Profile

Dr. Fan Nan

at Jinan University

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Proceedings Article | 9 September 2019 Presentation

Light-driven selective assembly and healing of optical matter (Conference Presentation)

Fan Nan, Zijie Yan

Proceedings Volume 11083, 1108326 (2019) https://doi.org/10.1117/12.2529265

KEYWORDS: Nanoparticles, Nanowires, Polarization, Silver, Optical binding, Thermodynamics, Thermography, Electrodynamics, Directed self assembly, Interferometry

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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.

Proceedings Article | 17 September 2018 Presentation

Probing stability of optical matter chains by polarization modulation (Conference Presentation)

Fan Nan, Zijie Yan

Proceedings Volume 10723, 107230X (2018) https://doi.org/10.1117/12.2320726

KEYWORDS: Polarization, Modulation, Nanoparticles, Optical binding, Gold, Particles, Plasmonics, Thermography

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Optical binding of plasmonic nanoparticles offers a unique route to assemble mesoscale clusters and chains. However, stability is an issue that prevents assembling large-scale optical matter from nanoparticles. Here, we report a new method to study and improve the spatiotemporal stability of optical matter chains consisting of gold nanospheres by modulating the polarization direction of a linearly polarized optical line trap. The optical binding strengths of gold nanoparticles with parallel and perpendicular polarized light are different, resulting in versatile oscillation properties of the nanoparticles with polarization modulation. We show that the optical binding strength is spatially inhomogeneous along the nanoparticle chains depending on the total number and relative positions of particles, and it is temporally variable depending on the frequency of polarization modulation. In particular, the average oscillation amplitude of the particles can be tuned by increasing the frequency of polarization modulation. The spatiotemporal stability of the optically bound nanoparticles can be improved when the polarization modulation speed is fast and the optical binding is strong enough to suppress thermal motion. This study represents a new way to manipulate optical forces at mesoscale, and provides important information for assembling large-scale optical matter with nanoparticles.

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