High-Efficiency Metalenses with Switchable Functionalities in Microwave Region

Zhang, Kuang; Yuan, Ye; Ding, Xumin; Ratni, Badreddine; Burokur, Shah Nawaz; Wu, Qun

doi:10.1021/acsami.9b07102

Cited by 182 publications

(112 citation statements)

References 60 publications

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“…The truncation of the lens also reduces the footprint of the designed tapers. Our design concept combined with metasurfaces may be used to manipulate the wavefront [42,43].…”

Section: Resultsmentioning

confidence: 99%

Ultrashort waveguide tapers based on Luneburg lens

Badri

Gilarlue

2019

J. Opt.

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In integrated photonic circuits, silicon-on-insulator waveguides with different geometries have been employed to realize a variety of components. Therefore, efficient coupling of two different waveguides is crucial. In this paper, focusing property of the Luneburg lens is exploited to design waveguide tapers. The Luneburg lens, truncated in a shape of a parabolic taper with reduced footprint, is utilized to connect a 10 µm-wide waveguide to a 0.5 µm one with the same thickness with an average coupling loss of 0.35 dB in the entire O, E, S, C, L, and U bands of optical communications. The proposed compact taper with the length of 11 µm is implemented by varying the thickness of the guiding layer and compared with three conventional tapers with the same length. However, designing a coupler to connect waveguides with different thicknesses and widths is more challenging. By applying quasi-conformal transformation optics, we flatten the Luneburg lens and consequently increase the refractive index on the flattened side. As a result, we are able to couple two waveguides with different thicknesses and widths. The numerical simulations are used to evaluate the theoretically designed tapers. To our knowledge, this is the first study presenting ultrashort tapers based on truncated Luneburg lens.

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“…The truncation of the lens also reduces the footprint of the designed tapers. Our design concept combined with metasurfaces may be used to manipulate the wavefront [42,43].…”

Section: Resultsmentioning

confidence: 99%

Ultrashort waveguide tapers based on Luneburg lens

Badri

Gilarlue

2019

J. Opt.

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“…The dual OAM beams metasurface achieve 71% efficiency at 29.4 GHz and over 50% in a frequency bandwidth of 13%. In Reference [80], the authors proposed a mechanism for producing distinct OAM modes in orthogonal circular polarized (CP) transmitted fields, which breakthrough the inherent symmetric restriction between orthogonal CP waves (Figure 13d). The vortex beam carrying an OAM with mode l = 1 was generated in the cross-polarized output field under RHCP illumination, while the OAM with mode l = 3 is produced through cross-polarization under LHCP illumination.…”

Section: Transmissive Metasurfacesmentioning

confidence: 99%

A Review of Orbital Angular Momentum Vortex Beams Generation: From Traditional Methods to Metasurfaces

et al. 2020

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In this paper, we review the generation of vortex beams carrying orbital angular momentum in the microwave domain. We firstly present the theory of Laguerre–Gaussian beams where it is demonstrated that they carry such type of momentum. We further provide an overview of the classical methods used to generate orbital angular momentum vortex beams, which rely on two main methods; plane wave to vortex wave conversion and direct generation using radiating antennas. Then, we present recent progress in the physics of metasurfaces devoted to the generation of vortex beams with a discussion about reflective and transmissive metasurfaces for plane wave to vortex wave conversion as well as methods to reduce the intrinsic divergence characteristics of vortex beams. Finally, we conclude on this rapidly developing research field.

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“…DGS and EBG are preferred methods to reduce MC. Some of the advancements in metasurfaces like realizations of various polarization-independent properties for all frequency spectra were studied in [15,16]. In the present study, the authors investigate different EBG structures on a simple microstrip antenna to reduce MC between elements of 2 × 2 MIMO antenna for 5G communication.…”

Section: Introductionmentioning

confidence: 99%

Two Port Compact Mimo Antenna for Ism Band Applications

Sharma¹

2020

PIER C

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This article presents a compact size and high isolation 2 × 2, Multi-Input Multi-Output (MIMO) antenna for Industrial Scientific and Medical (ISM) band and 5G lower frequency band of 5G applications. Mutual coupling has been a great challenge in these applications. To improve isolation between elements of 2 × 2 MIMO antennas, a mushroom-shaped electromagnetic bandgap (EBG) and a fractal shaped EBG have been investigated. The overall size of the proposed antenna is 38.2 × 95.94 × 1.6 mm 3 with inter-element spacing (edge to edge) of 0.140λ. The proposed antenna has been designed, simulated, fabricated, and tested. The resulting outcome shows that the antenna operates in the band of 2.43-2.50 GHz and radiates in TM 10 mode. By using fractal shaped EBG, isolation of −24.67 dB is achieved. Apart from isolation, other performance parameters of the MIMO antenna are verified. The proposed antenna is suitable for weather radar, surface ship radar, satellite communication, and wireless local area network (WLAN) applications.

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High-Efficiency Metalenses with Switchable Functionalities in Microwave Region

Cited by 182 publications

References 60 publications

Ultrashort waveguide tapers based on Luneburg lens

Ultrashort waveguide tapers based on Luneburg lens

A Review of Orbital Angular Momentum Vortex Beams Generation: From Traditional Methods to Metasurfaces

Two Port Compact Mimo Antenna for Ism Band Applications

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