ORCID Profile
0000-0001-7736-8696
Current Organisation
University of Tokyo
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Publisher: AIP Publishing
Date: 08-2023
DOI: 10.1063/5.0161337
Abstract: We present a new concept of metasurface filters to preferentially extract pulsed waveforms at a constant frequency from a complex superimposed input signal. This filtering capability is realized using circuit-based metasurfaces, denoted waveform-selective metasurfaces, that behave according to the pulse duration of the incident wave. Importantly, our metasurface filters overcome a long-lasting issue of eliminating unnecessary pulses under simultaneous incidence without relying on variables that are commonly used for modulation schemes, e.g., frequency, time, and spatial variation (angular dependence). Such simultaneous filtering is made possible by integrating several types of waveform-selective metasurface unit cells with delay lines and successive interference cancellation processes. Moreover, we show that our concept can be extended to incorporating broadband signals, additional pulses, and variables used for existing modulation schemes. Our study therefore provides a higher degree of freedom to control electromagnetic waves and phenomena with possible applications including wireless power transfer and communications.
Publisher: IOP Publishing
Date: 15-11-2022
Abstract: With their self-tuned time-varying responses, waveform-selective metasurfaces embedded with nonlinear electronics have shown fascinating applications, including distinguishing different electromagnetic waves depending on the pulse width (PW). However, thus far they have only been realized with a spatially homogeneous scattering profile. Here, by modeling a metasurface as time-varying admittance sheets, we provide an analytical calculation method to predict the metasurface time-domain responses. This allows derivation of design specifications in the form of equivalent sheet admittance, which is useful in synthesizing a metasurface with spatiotemporal control, such as to realize a metasurface with prescribed time-dependent diffraction characteristics. As an ex le, based on the proposed equivalent admittance sheet modeling, we synthesize a waveform-selective Fresnel zone plate with variable focal length depending on the incoming PW. The proposed synthesis method for PW-dependent metasurfaces may be extended to designing metasurfaces with more complex spatiotemporal wave manipulation, benefiting applications such as sensing, wireless communications and signal processing.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 1999
Location: United Kingdom of Great Britain and Northern Ireland
Location: Japan
No related grants have been discovered for Shinya Sugiura.