A Metasurfaces Review: Definitions and Applications

Bukhari, Syed Sheheryar; Vardaxoglou, J.C.; Whittow, William G.

doi:10.3390/app9132727

Cited by 200 publications

(119 citation statements)

References 99 publications

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“…where X a , M, and p are as defined in (1). When an LWA is sinusoidally impedance modulated with (2), the fundamental Floquet mode (n = 0) is a slow surface-wave mode.…”

Section: Lwa Theorymentioning

confidence: 99%

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Analysis and Design of Checkerboard Leaky-Wave Antennas With Low Radar Cross Section

Ramalingam

Balanis

Birtcher

et al. 2020

IEEE Open J. Antennas Propag.

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This paper addresses the analysis and design of a new class of metasurface leaky-wave antennas (LWAs) that inherently have low monostatic radar cross section (RCS) for normal incidence parallel polarization. The impedance profile of these antennas is modulated with a square wave to achieve leaky-wave behavior with low RCS. The low RCS performance is justified by the concepts of generalized Snell's law of reflection and array theory. When the reflection phase difference between consecutive periods is near 180 • , the power reflected in the specular direction is minimal. It is also shown that modulating the surface impedance with a square wave still results in a high-gain fan beam similar to that of a sinusoidal modulation; however, the trade-off for obtaining a low RCS is an increase in the sidelobe level due to radiation from higher-order harmonics. A similar trade-off exists between the gain/beamwidth and RCS reduction. A prototype of an LWA with low RCS was fabricated and measured; an excellent agreement was observed between simulations and measurements.

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“…where X a , M, and p are as defined in (1). When an LWA is sinusoidally impedance modulated with (2), the fundamental Floquet mode (n = 0) is a slow surface-wave mode.…”

Section: Lwa Theorymentioning

confidence: 99%

“…M ETASURFACE leaky-wave antennas (LWAs) are radiating structures with thin and light-weight geometries that are characterized by high gains and narrow beamwidths [1]. LWAs has been an attractive topic ever since the high gain from sinusoidally-modulated impedance surfaces was interpreted using leaky waves in [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Checkerboard Leaky-Wave Antennas With Low Radar Cross Section

Ramalingam

Balanis

Birtcher

et al. 2020

IEEE Open J. Antennas Propag.

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show abstract

“…To meet the growing requirement of device miniaturization and system integration, metasurfaces have emerged as a versatile platform for wavefront shaping [1][2][3][4][5][6][7]. Metasurfaces are one kind of such diffractive optical elements with flat subwavelength implementations, which consist of quasiperiodic arrays of light resonators (also called as meta-atoms) [8,9].…”

Section: Introductionmentioning

confidence: 99%

Imaging based on metalenses

et al. 2020

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Metalens, a prominent application of two-dimensional metasurfaces, has demonstrated powerful abilities even beyond traditional optical lenses. By manipulating the phase distribution of metalens composed of appropriately arranged nanoscale building blocks, the wavefront of incident wave can be controlled based on Huygens principle, thus achieving the desired reflected and transmitted wave for many different purposes. Metalenses will lead a revolution in optical imaging due to its flat nature and compact size, multispectral acquisition and even off-axis focusing. Here, we review the recent progress of metalenses presenting excellent properties, with a focus on the imaging application using these metalenses. We firstly discuss the mechanism for achieving metalenses with high efficiency, large numerical aperture, controlling the chromatic dispersion or monochromatic aberrations and large area fabrication. Then, we review several important imaging applications including wide-band focusing imaging, polarization dependent imaging, light field imaging and some other significant imaging systems in different areas. Finally, we make a conclusion with an outlook on the future development and challenges of this developing research field.

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“…Another reason is that proposed structure is not isotropic in nature. The cross-polarization reflection is increases because the proposed design is an-isotropic in nature [2]- [4].…”

Section: Introductionmentioning

confidence: 99%

Comment on “Design and Characterization of an Ultrabroadband Metamaterial Microwave Absorber”

et al. 2020

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The authors have proposed an Ultrabroadband Metamaterial Microwave Absorber. The authors have claimed that the proposed structure is metamaterial absorber. We have recognized that the designed structure is not a metamaterial absorber because of ignorance of cross-polarized reflection coefficient. The designed structure is polarization convertor because the proposed unit cell has an-isotropic geometry.

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A Metasurfaces Review: Definitions and Applications

Cited by 200 publications

References 99 publications

Analysis and Design of Checkerboard Leaky-Wave Antennas With Low Radar Cross Section

Analysis and Design of Checkerboard Leaky-Wave Antennas With Low Radar Cross Section

Imaging based on metalenses

Comment on “Design and Characterization of an Ultrabroadband Metamaterial Microwave Absorber”

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