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Metamaterial - OSTI GOV

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Last Updated: 15 May 2022

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Spontaneous emission dynamics of Eu 3+ ions coupled to hyperbolic metamaterials

We investigate a system containing Eu 3+ 3 6O nanocrystals embedded in a porous Al2O 3 matrix. The 5 D 0 7 F 2 transition, led to a 2. 4 fold rise in decay rates among Eu 3+ ions, as well as an increase in the emission rate of the HMM-coupled Eu 3+ transition.

Source link: https://www.osti.gov/biblio/1853651


Multiple Tunable Hyperbolic Resonances in Broadband Infrared Carbon-Nanotube Metamaterials

We find distinctive subwavelength field profiles at the fundamental and higher-order resonant frequencies in a near-field scanning optical microscopy imaging study of nanotube metamaterial resonators. The nanotube metamaterials' wafer-scale region of the nanotube metamaterials allows us to combine near-field imaging with a more systematic far-field spectroscopic investigation of many resonator arrays' scaling properties. Broadband extinction in the 3–5 mm atmospheric transparency window through the coexistence of multiple modes in individual ribbons shows broadband extinction from 1. 5–10 mm and reversibly switchable extinction in the 3–5 mm atmospheric transparency window.

Source link: https://www.osti.gov/biblio/1853033


Superconducting metamaterials - the first step toward a microwave quantum bus

Quantitative information science is based on Coherent manipulation of quantum states. Quantum techniques are relying on microwave fields for quantum operations. As such, the microwave electromagnetic fields serve as the ideal "quantum bus" to connect various types of QIS devices into a hybrid quantum device. These superconducting resonant microstructures are artificial materials made up of arrays of superconducting resonant microstructures with much smaller dimensions than the microwave wavelengths of interest. Although maintaining very low loss, microwave quantum bus metamaterials are a good candidate medium for the microwave quantum bus, due to the efficient impedance, field distribution, and frequency response that can all be controlled by designing the microstructures, electrical bias, and magnetic flux while maintaining extremely low loss. We first investigated the properties of sputtered NbTiN thin films by correlating the film thickness with the desired state resistivity, superconducting transition temperature, and resonances of transmission line resonators produced from these films.

Source link: https://www.osti.gov/biblio/1663263


Performance evaluation of a metamaterial-based new cool roof using improved Roof Thermal Transfer Value model

This research investigated the model for both RadiCold cool roof and traditional roofing structures, considering that the RadiCold film has unique optical and thermal characteristics, as well as the new Roof Thermal Transfer Value model neglecting the effect of roof thermal mass, which can lead to overestimating the cooling load from roofs. The improved Roof Thermal Transfer Value model can more accurately reflect the heat gains or losses across the roofs, according to results from the reduced-size model building experiments. The cooling load reduction in using RadiCold cool roof resulted in cooling electricity savings of 113. 0-143. 9 kWh/ compared to the shingle roof and 88. 0–92. 4 kWh/ in comparison to the Thermoplastic Polyolefin roof for the three analyzed locations with an assumed air conditioning coefficient of performance of 3. 0.

Source link: https://www.osti.gov/biblio/1613651

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions