Abstract
Metasurfaces have huge potentials to develop new type imaging systems due to their abilities of controlling electromagnetic waves. Here, we propose a new method for dual-sensor imaging based on cross-like holographic leaky-wave metasurfaces which are composed of hybrid isotropic and anisotropic surface impedance textures. The holographic leaky-wave radiations are generated by special impedance modulations of surface waves excited by the sensor ports. For one independent sensor, the main leaky-wave radiation beam can be scanned by frequency in one-dimensional space, while the frequency scanning in the orthogonal spatial dimension is accomplished by the other sensor. Thus, for a probed object, the imaging plane can be illuminated adequately to obtain the two-dimensional backward scattered fields by the dual-sensor for reconstructing the object. The relativity of beams under different frequencies is very low due to the frequency-scanning beam performance rather than the random beam radiations operated by frequency, and the multi-illuminations with low relativity are very appropriate for multi-mode imaging method with high resolution and anti- noise. Good reconstruction results are given to validate the proposed imaging method.
Highlights
Due to the low loss, low cost, and high performance, metasurfaces have found huge potential applications in controlling the electromagnetic waves in recent years, which are considered as the two-dimensional (2D) planar metamaterials[1,2,3,4]
Combining with the microwave holography, the desired radiation waves can be reproduced by exciting the hologram recorded by the interference between the object wave and reference wave[24,25]
If the hologram is expressed as Ψ = ψref + ψobj, in which ψref and ψref ψ2ψobojbrjeapcrceosrednint gthteo reference wave and object wave respectively, the reproduced wave ψrep can be the theory of holographic antennas[24,27]
Summary
Due to the low loss, low cost, and high performance, metasurfaces have found huge potential applications in controlling the electromagnetic waves in recent years, which are considered as the two-dimensional (2D) planar metamaterials[1,2,3,4]. Our group proposed a holographic metasurface that can generate the multi-beam radiations with two-dimensional frequency scanning[26]. The random holographic leaky-wave metasurfaces for imaging under compressed sensing was recently proposed[28], which could be considered as the single-sensor imaging system[29].
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