Controlling the Visible Electromagnetic Resonances of Si/SiO<sub>2</sub> Dielectric Core–Shell Nanoparticles by Thermal Oxidation

Tsuchimoto, Yuta; Yano, Taka Aki; Hada, Masaki; Nakamura, Kazutaka G.; Hayashi, T.; Hara, Masahiko

doi:10.1002/smll.201500884

Cited by 24 publications

(12 citation statements)

References 31 publications

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“…The scattering spectra of the corresponding individual Si nanospheres with the diameters obtained from SEM images are computed using Mie theory and are also displayed close to the experimental spectra for parallel analyses. The calculations were performed in effective surrounding medium of refractive index 1.25, given by the average between the air refractive index ( n = 1.0) and the glass substrate refractive index ( n = 1.5), and taking into account a 2 nm thick SiO 2 layer around the nanoparticle . The dark-field and SEM images confirm that the scattering color changes from blue to red with increasing the diameter from 90 to 155 nm.…”

Section: Resultsmentioning

confidence: 95%

Large-Scale and Low-Cost Fabrication of Silicon Mie Resonators

et al. 2019

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High index dielectric nanoparticles have been proposed for many different applications. However, widespread utilization in practice also requires large-scale production methods for crystalline silicon nanoparticles, with engineered optical properties in a low-cost manner.Here, we demonstrate a facile, low-cost, and large-scale fabrication method of crystalline silicon colloidal Mie resonators in water, using a blender. The obtained nanoparticles are polydisperse with an almost spherical shape and the diameters controlled in the range 100−200 nm by a centrifugation process. Then the size distribution of silicon nanoparticles enables broad extinction from UV to near-infrared, confirmed by Mie theory when considering the size distribution in the calculations. Thanks to photolithographic and drop-cast deposition techniques to locate the position on a substrate of the colloidal nanoparticles, we experimentally demonstrate that the individual silicon nanoresonators show strong electric and magnetic Mie resonances in the visible range.

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Section: Resultsmentioning

confidence: 95%

Large-Scale and Low-Cost Fabrication of Silicon Mie Resonators

et al. 2019

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“…Specifically, the electric field enhancement factors (EFs) of the typical and highest values of Ag and Au are 10 and 4000, respectively. In contrast, according to the previously reported researches on Si, − ,− GaP, , ZnO, TiO 2 , − ,, and two-dimensional materials , (Table ), the EFs of semiconductors are between 2 and 200, with an exception of the three systems (footnote b in Table ) analyzed by “specific local volume” around the nanostructure.…”

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confidence: 80%

Nanogap-Rich TiO₂ Film for 2000-Fold Field Enhancement with High Reproducibility

Hanatani

Yoshihara

Sakamoto

et al. 2020

J. Phys. Chem. Lett.

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Titanium dioxide (TiO 2 ) is a crucial semiconductor for photocatalysts, solar cells, hydrogen evolution reactions, and antivirus agents. The properties and performances of these applications can improve significantly if the integrated TiO 2 acts as a light harvester through a large field enhancement. This study investigates the electromagnetic field enhancement of a nanogap-rich TiO 2 film with a large area, prepared by a facile dry process at room temperature. Herein, the loading pressure is applied to the TiO 2 particles for closely packing them in the film. The field enhancement, as a function of the loading pressure, is explored from the fluorescence intensity enhancement of a dye molecule. An average enhancement factor >2000 is achieved, which is a remarkable record for semiconductors. Furthermore, the reproducibility is significant; the relative standard deviation value is small (∼4%). Calculations were performed using the finite-difference-time-domain method. A nanogap of 5 nm yields the highest EF for triangular-prism TiO 2 particles.

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“…This accumulated knowledge of Si oxidation should facilitate the color generation of very small Si nanostructures that have been difficult to fabricate. In addition, the core/shell nanostructure − of Si surrounded by an oxide film will behave differently from simple Mie resonators. Large changes in the resonance properties through Si oxidation will drastically expand color printing design variation.…”

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confidence: 99%

Control of Si-Based All-Dielectric Printing Color through Oxidation

et al. 2018

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All-dielectric color printing by means of high-index Mie resonators has enabled wider control of reflection colors depending on structural geometry. However, modifying the geometry, including the height, by using conventional fabrication processes remains challenging, and drastic color modification approaches via the addition of a new tuning axis are required to extend color varieties and applications. Here, we demonstrate all-dielectric pixel color control through Si oxidation. Oxidized monocrystalline Si nanostructures exhibit wider tunability of brilliant reflection colors depending on the oxidation reaction. The different color change properties of each nanostructure enable the construction of an "invisible ink" that can hide color information. This approach for controlling printing color could be utilized to further extend color variation and reactive applications.

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Controlling the Visible Electromagnetic Resonances of Si/SiO₂ Dielectric Core–Shell Nanoparticles by Thermal Oxidation

Cited by 24 publications

References 31 publications

Large-Scale and Low-Cost Fabrication of Silicon Mie Resonators

Large-Scale and Low-Cost Fabrication of Silicon Mie Resonators

Nanogap-Rich TiO₂ Film for 2000-Fold Field Enhancement with High Reproducibility

Control of Si-Based All-Dielectric Printing Color through Oxidation

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Controlling the Visible Electromagnetic Resonances of Si/SiO2 Dielectric Core–Shell Nanoparticles by Thermal Oxidation

Cited by 24 publications

References 31 publications

Large-Scale and Low-Cost Fabrication of Silicon Mie Resonators

Large-Scale and Low-Cost Fabrication of Silicon Mie Resonators

Nanogap-Rich TiO2 Film for 2000-Fold Field Enhancement with High Reproducibility

Control of Si-Based All-Dielectric Printing Color through Oxidation

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Product

Resources

About

Controlling the Visible Electromagnetic Resonances of Si/SiO₂ Dielectric Core–Shell Nanoparticles by Thermal Oxidation

Nanogap-Rich TiO₂ Film for 2000-Fold Field Enhancement with High Reproducibility