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您的检索式：作者名="BADREDDINE RATNI"
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| 1 | Complementary transmissive ultra-thin meta-deflectors for broadband polarization-independent refractions in the microwave region显示文摘Polarization manipulation is a significant issue for artificial modulation of the electromagnetic(EM) wave, but general mechanisms all suffer the restriction of inherent symmetric properties between opposite handedness.Herein, a strategy to independently and arbitrarily manipulate the EM wave with orthogonal circular polarizations based on a metasurface is proposed, which effectually breaks through traditional symmetrical characteristics between orthogonal handedness. By synthesizing the propagation phase and geometric phase, the appropriate Jones matrix is calculated to obtain independent wavefront manipulation of EM waves with opposite circular polarizations. Two transmissive ultra-thin meta-deflectors are proposed to demonstrate the asymmetrical refraction of transmitted circularly polarized waves in the microwave region. Simulated transmitted phase front and measured far-field intensity distributions are in excellent agreement, indicating that the transmitted wave with different polarizations can be refracted into arbitrary and independent directions within a wide frequency band(relative bandwidth of 25%). The results presented in this paper provide more freedom for the manipulation of EM waves, and motivate the realizations of various polarization-independent properties for all frequency spectra. | YUEYI YUAN KUANG ZHANG XUMIN DING BADREDDINE RATNI SHAH NAWAZ BUROKUR QUN WU | 2019 | Photonics Research2019，7，1： | 5 |
| 2 | Versatile metasurface platform for electromagnetic wave tailoring显示文摘The emergence of metasurfaces provides a novel strategy to tailor the electromagnetic response of electromagnetic waves in a controlled manner by judicious design of the constitutive meta-atom.However,passive metasurfaces tend to perform a specific or limited number of functionalities and suffer from narrow-frequency-band operation.Reported reconfigurable metasurfaces can generally be controlled only in a 1D configuration or use p-i-n diodes to show binary phase states.Here,a 2D reconfigurable reflective metasurface with individually addressable meta-atoms enabling a continuous phase control is proposed in the microwave regime.The response of the meta-atom is flexibly controlled by changing the bias voltage applied to the embedded varactor diode through an elaborated power supply system.By assigning appropriate phase profiles to the metasurface through voltage modulation,complex beam generation,including Bessel beams,vortex beams,and Airy beams,is fulfilled to demonstrate the accurate phase-control capability of the reconfigurable metasurface.Both simulations and measurements are performed as a proof of concept and show good agreement.The proposed design paves the way toward the achievement of real-time and programmable multifunctional meta-devices,with enormous potential for microwave applications such as wireless communication,electromagnetic imaging,and smart antennas. | RUI FENG BADREDDINE RATNI JIANJIA YI HAILIN ZHANG ANDRÉDE LUSTRAC SHAH NAWAZ BUROKUR | 2021 | Photonics Research2021，9，9： | 1 |
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