Inner structure of ZnO microspheres fabricated via laser ablation in superfluid helium

Minowa, Yosuke; Oguni, Yuya; Ashida, Masaaki

doi:10.1364/oe.25.010449

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…Laser ablation, or sputtering, is a unique in-situ preparation method to produce atoms, ions, and nano/microparticles in various environments; it is also applicable to superfluid 4 He. Laser ablation in superfluid 4 He has been used for precision spectroscopy[1-3], tracer injection [20], nano/micro structure formation [5,6], and optical manipulation/trapping [21,22]. In this study, we observed the silicon nanoparticledecorated, suspended quantised vortices, and identified the vortex reconnection events [13], the dynamics of which were found to be consistent with the results of dimensional analysis the simple vortex filament model (VFM) calculations.…”

Section: Introductionsupporting

confidence: 64%

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mentioning

confidence: 99%

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Visualisation of quantised vortex reconnection as enabled by laser ablation

Minowa,

Aoyagi,

Inui

et al. 2021

Preprint

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Impurity injection into superfluid helium is a simple yet unique method with diverse applications, including high-precision spectroscopy[1-3], quantum computing[4], nano/micro material synthesis [5,6], and flow visualisation [7]. Quantised vortices are believed to play a major role in the interaction between superfluid helium and light impurities [2,[8][9][10][11]. However, the basic principle governing the interaction is still controversial for dense materials such as semiconductor and metal impurities [5,12]. Herein, we provide experimental evidence of the attraction of the dense silicon nanoparticles to the quantised vortex cores. We prepared the silicon nanoparticles via insitu laser ablation. Following laser ablation, we observed that the silicon nanoparticles formed curved-filament-like structures, indicative of quantised vortex cores. We also observed that two accidentally intersecting quantised vortices exchanged their parts, a phenomenon called quantised vortex reconnection [13]. This behaviour closely matches the dynamical scaling of reconnections.Our results provide a new method for visualising and studying impurity-quantised vortex interactions.

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Section: Introductionsupporting

confidence: 64%

“…

…”

mentioning

confidence: 99%

Visualisation of quantised vortex reconnection as enabled by laser ablation

Minowa,

Aoyagi,

Inui

et al. 2021

Preprint

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“…Figure 1E shows the typical SEM image of the synthesized zinc oxide particles. The zinc oxide particles are highly spherical (28), which is suitable for optical trapping. Many synthesized zinc oxide particles have dimensionalities in the stability-size regime, although its difficult to control the synthesized particle size distribution.…”

Section: Particle Loadingmentioning

confidence: 99%

“…Determining the trapped particle size is very necessary because the size governs the interaction between the particle and the surrounding quantum fluid. In our study, zinc oxide particles of sizes ranging from nanometres to micrometres (28) were fabricated through the laser ablation process. We demonstrate the size determination of the actual trapped particle using the Mie scattering theory (29).…”

Section: Optical Trapping In Superfluid Heliummentioning

confidence: 99%

Optical trapping of nanoparticles in superfluid helium

Minowa,

Geng,

Kokado

et al. 2021

Preprint

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Optical tweezers, the three-dimensional confinement of a nanoparticle by a strongly focused beam of light, have been widely employed in investigating biomaterial nanomechanics, nanoscopic fluid properties, and ultrasensitive detections in various environments such as inside living cells, at gigapascal pressure, and under high vacuum. However, the cryogenic operation of solidstate-particle optical tweezers is poorly understood. In this study, we demonstrate the optical trapping of metallic and dielectric nanoparticles in superfluid helium below 2 K, which is two orders of magnitude lower than in the previous experiments. We prepare the nanoparticles via in-situ laser ablation.The nanoparticles are stably trapped with a single laser beam tightly focused in the superfluid helium. Our method provides a new approach for studying nanoscopic quantum hydrodynamic effects and interactions between quantum fluids and classical objects.Teaser Optical tweezers can grab nanoparticles at extremely low temperature (1.4 K), show-1

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“…Minowa and associates find that ZnO microspheres produced by laser ablation in superfluid helium contain bubble-like voids, even though they act as whispering gallery mode laser cavities [7]. The authors suggest that helium gas (or evaporated target material) contained in molten ZnO particles may create voids in the microspheres.…”

Section: Materials Processing By Structured Lightmentioning

confidence: 99%

Focus issue introduction: synergy of structured light and structured materials

Omatsu¹,

Litchinitser²,

Brasselet³

et al. 2017

Opt. Express

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Structured light beams, such as optical vortices, vector beams, and non-diffracting beams, have been recently studied in a variety of fields, such as optical manipulations, optical telecommunications, nonlinear interactions, quantum physics, and 'super resolution' microscopy.. Their unique physical properties, such as annular intensity profile, helical wavefront and orbital angular momentum, give rise to a plethora of new, fundamental light-matter interactions and device applications. Recent progress in nanostructured materials, including metamaterials and metasurfaces, opened new opportunities for structured light generation on the microscale that exceed the capabilities of bulk-optics approaches such as computer generated holography and diffractive optics. Furthermore, structured optical fields may interact with matters on the subwavelength scale to yield new physical effects, such as spin-orbital momentum coupling. This special issue of Optics Express focuses on the state-of-the-art fundamental research and emerging technologies and applications enabled by the interplay of "structured light" and "structured materials".

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Inner structure of ZnO microspheres fabricated via laser ablation in superfluid helium

Cited by 13 publications

References 28 publications

Visualisation of quantised vortex reconnection as enabled by laser ablation

Visualisation of quantised vortex reconnection as enabled by laser ablation

Optical trapping of nanoparticles in superfluid helium

Focus issue introduction: synergy of structured light and structured materials

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