Frequency-hopping wave engineering with metasurfaces

Hiroki Takeshita, Ashif Aminulloh Fathnan, Daisuke Nita, Atsuko Nagata, Shinya Sugiura and Hiroki Wakatsuchi ()
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Hiroki Takeshita: Nagoya Institute of Technology, Gokiso-cho, Showa
Ashif Aminulloh Fathnan: Nagoya Institute of Technology, Gokiso-cho, Showa
Daisuke Nita: Nagoya Institute of Technology, Gokiso-cho, Showa
Atsuko Nagata: Nagoya Institute of Technology, Gokiso-cho, Showa
Shinya Sugiura: The University of Tokyo
Hiroki Wakatsuchi: Nagoya Institute of Technology, Gokiso-cho, Showa

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Wave phenomena can be artificially engineered by scattering from metasurfaces, which aids in the design of radio-frequency and optical devices for wireless communication, sensing, imaging, wireless power transfer and bio/medical applications. Scattering responses vary with changing frequency; conversely, they remain unchanged at a constant frequency, which has been a long-standing limitation in the design of devices leveraging wave scattering phenomena. Here, we present metasurfaces that can scatter incident waves according to two variables—the frequency and pulse width—in multiple bands. Significantly, these scattering profiles are characterized by how the frequencies are used in different time windows due to transient circuits. In particular, by using more than one frequency with coupled transient circuits, we demonstrate variable scattering profiles in response to unique frequency sequences, which can break a conventional linear frequency concept and markedly increase the available frequency channels in accordance with a factorial number of frequencies used. Our proposed concept, which is analogous to frequency hopping in wireless communication, advances wave engineering in electromagnetics and related fields.

Date: 2024
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DOI: 10.1038/s41467-023-44627-8

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