Impedance-matched metadevices with a single matrix material
Abstract Artificial periodic structures including photonic crystals (PCs) and metamaterials have been widely employed to construct metadevices, whereas their effective refractive indices n e and relative impedances Z r are usually coupled together and hard to design separately. Here, we present a me...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-05-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-025-01559-1 |
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| Summary: | Abstract Artificial periodic structures including photonic crystals (PCs) and metamaterials have been widely employed to construct metadevices, whereas their effective refractive indices n e and relative impedances Z r are usually coupled together and hard to design separately. Here, we present a method for flexibly tuning the indices n e and impedances Z r of PCs. The unit cell of PC consists of a dielectric matrix with multiple air holes symmetrically distributed around the center of the unit cell. We find that the index n e of the PC mainly depends on the filling ratio of the dielectric, while its impedance Z r relies on the position of the holes. When the holes have an appropriate distance from the center of the unit cell, matched impedances (Z r = 1) can be achieved for PCs with different indices n e . As a result, impedance-matched metadevices, such as generalized Mikaelian lenses with high efficiency (> 96%), can be constructed even with high refractive indices in their matrices. |
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| ISSN: | 2045-2322 |