Dynamic Coupling of Optically Evolved Assembling and Swarming of Gold Nanoparticles with Photothermal Local Phase Separation of Polymer Solution

Aibara, Issei; Huang, Chih‐Hao; Kudo, Tetsuichi; Bresolí‐Obach, Roger; Hofkens, Johan; Furube, Akihiro; Masuhara, Hiroshi

doi:10.1021/acs.jpcc.0c02777

Cited by 19 publications

(20 citation statements)

References 47 publications

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“…The selective excitation of electric and magnetic dipolar modes by PDF has been shown in previous works [36][37][38] and can be explicitly derived from the multipole expansion of a circularly polarized PW,…”

mentioning

confidence: 79%

Multiple Kerker Anapoles in Dielectric Microspheres

Sanz-Fernández

Molezuelas-Ferreras

Lasa-Alonso

et al. 2021

Laser & Photonics Reviews

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High refractive index dielectric spheres present remarkable light-scattering properties in the spectral range dominated by dipolar modes. However, most of these properties are absent for larger spheres under plane wave illumination. Here, a proposal to unravel these dipolar regimes for larger particles under the illumination of a pure dipolar field is presented. This type of illumination ensures that the scattering response of the sphere is purely dipolar. In this scenario, it is shown that Kerker conditions are not only related to duality symmetry and a strong backward-to-forward asymmetric light-scattering, but also to the appearance of non-radiating sources: the so-called hybrid anapoles. Finally, it is shown that all the above-mentioned scattering features under dipolar illumination are reproducible with an experimentally accessible tightly-focused Gaussian beam.

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mentioning

confidence: 79%

Multiple Kerker Anapoles in Dielectric Microspheres

Sanz-Fernández

Molezuelas-Ferreras

Lasa-Alonso

et al. 2021

Laser & Photonics Reviews

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“…Shoji and Tsuboi describe the developments of plasmonic optical tweezers for soft nanomaterials. The combination of resonant optical trapping with nano patterned plasmonic surfaces permits small molecule manipulation, such as heme proteins (Shoji and Tsuboi, 2014 ) the photothermal effect of AuNPs can be harnessed to drive phase separation of polymer solution along with assembling and swarming of AuNPs simultaneously (Aibara et al, 2020 ).…”

Section: Applications In Biomedical Engineeringmentioning

confidence: 99%

Applications of Optically Controlled Gold Nanostructures in Biomedical Engineering

Phummirat

Mann

Preece

2021

Front. Bioeng. Biotechnol.

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Since their inception, optical tweezers have proven to be a useful tool for improving human understanding of the microscopic world with wide-ranging applications across science. In recent years, they have found many particularly appealing applications in the field of biomedical engineering which harnesses the knowledge and skills in engineering to tackle problems in biology and medicine. Notably, metallic nanostructures like gold nanoparticles have proven to be an excellent tool for OT-based micromanipulation due to their large polarizability and relatively low cytotoxicity. In this article, we review the progress made in the application of optically trapped gold nanomaterials to problems in bioengineering. After an introduction to the basic methods of optical trapping, we give an overview of potential applications to bioengineering specifically: nano/biomaterials, microfluidics, drug delivery, biosensing, biophotonics and imaging, and mechanobiology/single-molecule biophysics. We highlight the recent research progress, discuss challenges, and provide possible future directions in this field.

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“…In the case of polystyrene (PS) nanoparticles (NPs) their periodical array and disc‐like structure with concentric circle or hexagonal packing are formed [52,53] . Interestingly, Au NPs demonstrate assembling and swarming at glass/solution interface, where the NPs fluctuate like a group of bees [54,55] . We call these phenomena “optically evolved assembling and swarming”, and we have elucidated their dynamics and mechanism [56] .…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle Assembling Dynamics Induced by Pulsed Optical Force

Chen

Chiang

Kudo

et al. 2021

The Chemical Record

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Femtosecond (fs) laser trapping dynamics is summarized for silica, hydrophobically modified silica, and polystyrene nanoparticles (NPs) in aqueous solution, highlighting their distinct optical trapping dynamics under CW laser. Mutually repulsive silica nanoparticles are tightly confined under fs laser compared to CW laser trapping and, upon increasing laser power, they are ejected from the focus as an assembly. Hydrophobically modified silica and polystyrene (PS) NPs are sequentially ejected just like a stream or ablated, giving bubbles. The ejection and bubbling take place with the direction perpendicular to laser polarization and its direction is randomly switched from one to the other. These characteristic features are interpreted from the viewpoint of single assembly formation of NPs at an asymmetric position in the optical potential. Temporal change in optical forces map is prepared for a single PS NP by calculating scattering, gradient, and temporal forces. The relative contribution of the forces changes with the volume increase of the assembly and, when the pushing force along the trapping pulse propagation overcome the gradient in the focal plane, the assembly undergoes the ejection. Further fs multiphoton absorption is induced for the larger assembly leading to bubble generation. The assembling, ejection, and bubbling dynamics of NPs are characteristic features of pulsed optical force and are considered as a new platform for developing new material fabrication method.

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Dynamic Coupling of Optically Evolved Assembling and Swarming of Gold Nanoparticles with Photothermal Local Phase Separation of Polymer Solution

Cited by 19 publications

References 47 publications

Multiple Kerker Anapoles in Dielectric Microspheres

Multiple Kerker Anapoles in Dielectric Microspheres

Applications of Optically Controlled Gold Nanostructures in Biomedical Engineering

Nanoparticle Assembling Dynamics Induced by Pulsed Optical Force

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