Significant suppression of Rayleigh scattering loss in silica glass formed by the compression of its melted phase

Ono, Madoka; Aoyama, Shuhei; Fujinami, Masanori; Ito, Setsuro

doi:10.1364/oe.26.007942

Cited by 27 publications

(31 citation statements)

References 12 publications

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“…c Variation of the largest void radius from both experiments (red, up to 0.2 GPa) and MD simulations. The inset is a close-up view of the pressure region from 0 to 1 GPa where the dashed line is a guide for eyes to show the consistent trends between the simulation results and the positron annihilation lifetime spectroscopy experiments 15 . The error bar is calculated from the standard deviation of multiple samples.…”

Section: Structure Of Hot-compressed Silica Glass From MDmentioning

confidence: 69%

“…4a. Specifically, a scattering loss~0.081 dB km −1 due to Rayleigh scattering can be achieved at 4 GPa, which is in the same ballpark as the Rayleigh scattering loss of conventional/hot-compressed silica in experiments 11,15 and is extremely low given the much higher cooling rate used in MD (1 K ps −1 ). However, a further increase of P Q to 12 GPa will instead enhance the scattering by more than 10 times, in contrast with Fig.…”

Section: Calculation Of Rayleigh Scattering Of Densified Silica Glassmentioning

confidence: 84%

“…2c. Despite the fact that the experimental data (red points) from positron annihilation lifetime spectroscopy 15 are only available up to P Q = 0.2 GPa, the largest void size results from MD up to this range show a very good agreement in both the absolute value and the trend.…”

Section: Structure Of Hot-compressed Silica Glass From MDmentioning

confidence: 97%

“…However, reductions in cooling rate or annealing cause a significant decrease in production yield, and compositional variations can lead to an increase in loss due to chemical concentration fluctuations 14 . Recent experimental reports have shown that controlling the pressure history of silica can affect the density fluctuations or heterogeneity and the Rayleigh/X-ray scattering 15,16 . This method of controlling fictive pressure has provide a new train of thought to achieve even lower propagation loss of silica glass.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, in this study, we use molecular dynamics (MD) simulations to examine how density fluctuation of SiO 2 glass can be suppressed under conditions of varying pressure, including conditions beyond those reported in the experiments 15 . The MD simulations provide a direct probe to the SiO 2 network structure which can be compared with experimental results for density and void size within the experimentally achievable applied pressures.…”

Section: Introductionmentioning

confidence: 99%

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Topological pruning enables ultra-low Rayleigh scattering in pressure-quenched silica glass

Yang

Homma²,

Urata³

et al. 2020

npj Comput Mater

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Silica glass is the most indispensable material in optical communication applications due to its superior optical properties. The transmission loss of silica glass has been reduced over the past 30 years by continuous efforts toward decreasing density fluctuations by lowering of fictive temperature, e.g., through improvements in processing or doping. A recent study has shown that shrinkage of structural voids by hot compression is a promising way to further decrease the loss. However, an atomic understanding of the pressure effect is still lacking. Here, using molecular simulations, we connect the void shrinkage to topological pruning of silica network. Two physical models predict that the Rayleigh scattering loss of pressure-quenched silica glass can be reduced by >50% when the glass is quenched at an appropriate pressure (4 GPa in our simulation). Our studies are consistent with available experimental results and demonstrate topologically optimized structure can give desirable properties for optical applications of silica as well as other glasses with similar network structure.

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Section: Structure Of Hot-compressed Silica Glass From MDmentioning

confidence: 69%

Section: Calculation Of Rayleigh Scattering Of Densified Silica Glassmentioning

confidence: 84%

Section: Structure Of Hot-compressed Silica Glass From MDmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Topological pruning enables ultra-low Rayleigh scattering in pressure-quenched silica glass

Yang

Homma²,

Urata³

et al. 2020

npj Comput Mater

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Visibly Transparent Radiative Cooler under Direct Sunlight

Kim

Lee

Son

et al. 2021

Advanced Optical Materials

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Transparency is an important characteristic in practical applications of radiative cooling, but the transmitted sunlight trapped in an inner space is generally the main cause of the increasing temperature. A transparent radiative cooler that can lower a temperature during the daytime by transmitting visible light, reflecting near‐infrared (NIR) light, and radiating thermal energy through the atmospheric window is proposed. In contrast to transparent selective emitters that transmit most of the incoming solar irradiance under direct sunlight and opaque radiative coolers that reflect all solar energy, the proposed cooler achieves transparency and the cooling effect simultaneously by selectively blocking solar absorption in the NIR regime. Outdoor rooftop measurements confirm that the cooler can reduce i) the inner temperature of an absorbing system and ii) its own temperature when combined with commercially available paints. During daytime, the cooler provides a temperature reduction of a maximum 14.4 °C and 10.1 °C for the inner and own temperature, respectively, and of an average 5.2 °C and 4.3 °C, respectively, in comparison to the transparent selective emitter. The proposed cooler can reduce the temperature during the daytime while maintaining transparency, confirming its possibilities in practical applications such as passive diurnal cooling of vehicles or buildings and compatibility with current paint technologies for aesthetic use.

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Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy

Chiari

Nippa

Ikeda

et al. 2022

J of Applied Polymer Sci

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The free volume in the amorphous phase of a simple carbon‐black‐filled peroxide cross‐linked isoprene rubber (IR) is investigated by positron annihilation lifetime spectroscopy to clarify the structural changes in the rubber phase by the carbon black (CB) fillers. The ortho‐positronium (o‐Ps) pick‐off annihilation lifetime measured in the rubber without CB is around 2.8 ns and is found to be almost constant even after CB filling. This result indicates that in a portion of the rubber phase the free volume remains similar in size to that in the cross‐linked IR without CB. The o‐Ps intensity drastically decreases from 37% without CB to 15% with a CB loading as high as 80 phr. This decline is revealed to exceed the contribution, which is expected only from the decrease in the fraction of the amorphous phase by CB addition, by a factor of 0.37 at the highest CB loading. The additional reduction is related to the generation of a bound rubber layer surrounding the CB fillers with low molecular‐chain mobility where positronium formation is inhibited. The decrease rate is found to represent the volume of this rigid rubber phase and strongly depend on the formation of the CB network structure.

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Significant suppression of Rayleigh scattering loss in silica glass formed by the compression of its melted phase

Cited by 27 publications

References 12 publications

Topological pruning enables ultra-low Rayleigh scattering in pressure-quenched silica glass

Topological pruning enables ultra-low Rayleigh scattering in pressure-quenched silica glass

Visibly Transparent Radiative Cooler under Direct Sunlight

Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy

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