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Team develops a powerful Bragg reflector with ultrahigh refractive index metamaterial

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Schematic showing that nanoparticle-assembled ultra-high-index metamaterials can be fabricated and used as optical materials. Credit: POSTECH

We all look at ourselves in the mirror at least once a day. Mirrors are used not only in everyday life, but also in cutting-edge technologies such as semiconductor processes and high-definition displays. Recently, strong Bragg reflectors based on high-index metamaterials have been developed to reflect only the desired light.

A research team led by Prof. Gi-Ra Yi (Department of Chemical Engineering) of POSTECH, together with a research team led by Prof. Seok Joon Kwon and Prof. Pil Jin Yoo (Department of Chemical Engineering) of Sungkyunkwan University, developed an ultra-high refractive index meta developed the material.gold nanospheres and reflector It is a combination of metamaterials and polymers.

Metamaterials with properties not found in nature can be engineered to have negative (-) or ultra-high refractive indices. However, high-index metamaterials still have limitations from design to fabrication.

To overcome this problem, the research team developed a metamaterial that is uniformly arranged with 1-nanometer-level gaps by assembling spherical gold nanoparticles. This material, which maximizes the interaction of light and matter, has recorded the highest refractive indices in the visible and near-infrared regions. The 2D superstructure showed the highest refractive index ever, 7.8.

Distributed Bragg reflectors (DBRs), which are stacks of these metamaterials and low-index polymer layers, strongly reflect specific wavelengths.

In addition, the research team established a theory of plasmonic percolation model that can explain the very high refractive index. To theoretically explain the ultra-high refractive index of metamaterial We have clarified things that could not be explained by previous research, and it is expected that related research fields will develop in the future.

This research is attracting attention from academia and industry as it can be applied to precision semiconductor processes and high-definition displays.

This research advanced materials.

Sulfur-containing polymer provides high refractive index and transparency

For more information:
Dong-In Shin et al, Percolated plasmonic superlattices of nanospheres with 1 nm-level gaps as high-index metamaterials, advanced materials (2022). DOI: 10.1002/adma.202203942

Provided by Pohang University of Science and Technology (POSTECH)

Quote: Team Develops Powerful Bragg Reflectors with Ultra-High-Index Metamaterials (September 27, 2022) https://phys.org/news/2022-09-team-powerful-bragg Retrieved 09/29/2022 from -reflector-ultrahigh.html

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