Dr. Chih-Hao Huang Profile

Dr. Chih-Hao Huang

at National Yang Ming Chiao Tung Univ.

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Proceedings Article | 30 September 2024 Presentation + Paper

A plasmonic machine at solution interface: optical trapping and swarming of gold nanoparticles

Hiroshi Masuhara, Mu-En Li, Pin-Hsun Huang, Chih-Hao Huang

Proceedings Volume 13126, 1312602 (2024) https://doi.org/10.1117/12.3028396

KEYWORDS: Gold, Nanoparticles, Glasses, Nanolithography, Silica

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We study unique optical trapping phenomenon at glass/solution interface for gold nanoparticles with the diameter of 200 ~ 400 nm. With prolonged irradiation, gathering of many NPs forms a dynamically moving and fluctuating assembly like a flying group of birds in sky. We call this phenomenon as optical trapping and swarming, which extends to a few ten µm, much larger than the focal area of the 1064 nm trapping laser. We have elucidated the swarming dynamics and mechanism in view of optical binding and its expanded network, while here we design new experiments of the swarming toward a plasmonic machine, depending on laser polarization. The morphology and size of the Au NP swarming is intrinsically determined by optical, physical, and chemical parameters of NP, which is demonstrated by utilizing silica-coated gold nanoparticles. Further the swarming can be controlled by performing trapping and swarming on patterned glasses; one is on gold nanodisk pattern fabricated lithographically and the other is on polycaprolactone microchannel prepared by electrospinning writing method. The dumbbell-shaped morphology is switched from bidirectional to unidirectional, and its shape is modified. The dynamically fluctuating Au NPs can induce hydrodynamic flow in solution and give mechanical pressure to the surrounding. Also, the swarming NPs are heated by photo-absorption of the 1064 nm laser. The present findings indicates that the swarming gold nanoparticles can work as a plasmonic machine, and its systematic study will enable various designs of dynamic matter in the few ten micrometer domain.

Proceedings Article | 5 October 2023 Presentation + Paper

Optically evolved assembling and swarming of gold nanoparticles at solution interface leading to a plasmonic machine

Hiroshi Masuhara, Chih-Hao Huang

Proceedings Volume 12663, 1266302 (2023) https://doi.org/10.1117/12.2678023

KEYWORDS: Nanoparticles, Gold, Interfaces, Polarization, Plasmonics, Optical binding, Nanolithography, Laser scattering, Laser irradiation, Gold nanoparticles

Read Abstract +

In optical trapping of gold (Au) nanoparticles (NPs) at a glass/solution interface, initially NPs align in the manner of optical binding not only inside but also outside of the focused trapping site. Further gathering and assembling of more NPs lead to the formation of their dynamically moving and fluctuating assembly like a flying group of bees in air. Since we found this phenomenon, we have been systematically studying its dynamics and mechanism. It shows clear dependence on trapping laser polarization. The assembling and swarming expand linearly with the direction perpendicular to linear laser polarization, giving a dumbbell shape morphology, while a disk like one is prepared for circularly polarized laser. The morphology and the size of such assemblies can be controlled by tuning optical, physical, and chemical parameters based on the intrinsic surface plasmon resonance properties of Au NPs. We demonstrate new appearance of two swarms with ellipse and ring distribution of NPs by shifting the axial position of the trapping laser focus with respect to the interface. The contours of the dumbbell shape can be controlled by the incident and focusing angles of the trapping laser. Upon using the Au NPs with different size, shape, and structures, surprisingly unique dynamic behavior is observed. Further we introduce nanolithographically fabricated gold nanopattern as a glass interface, showing a new control way of the swarming morphology. These results show high potential of “optically evolved assembling and swarming” in the studies on nanophotonic machine.

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