Coherent Perfect Diffraction in Metagratings

AbstractMetasurfaces are 2D engineered structures with subwavelength granularity, offering a wide range of opportunities to tailor the impinging wavefront. However, fundamental limitations on their efficiency in wave transformation, associated with their deeply subwavelength thickness, challenge their implementation in practical application scenarios. Here, it is shown how the coherent control of metagratings through multiple wave excitations can provide new opportunities to achieve highly reconfigurable broadband metasurfaces with large diffraction efficiency, beyond the limitations of conventional approaches. Remarkably, energy distribution between the 0th and higher diffraction orders can be continuously tuned by changing the relative phase difference between two excitation waves, enabling coherent control, with added benefits of enhanced efficiency and bandwidth. This concept is demonstrated for a thin electric metagrating operating at terahertz frequencies, showing that coherent control can overcome several of the limitations of single‐layer ultrathin metastructures, and extend their feasibility in various practical scenarios.

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Details

Published: Jul 23, 2020
Vol/Issue: 32(36)
License: View

Authors

Z

Ziying Zhang

Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 P. R. China

M

Ming Kang

Department of Electrical and Computer Engineering The University of Texas at Austin Austin TX 78712 USA

X

Xi Feng

Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 P. R. China

Y

Yuehong Xu

Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 P. R. China

X

Xieyu Chen

Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 P. R. China

H

Huifang Zhang

Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 P. R. China

Q

Quan Xu

Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 P. R. China

Z

Zhen Tian

Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 P. R. China

W

Weili Zhang

School of Electrical and Computer Engineering Oklahoma State University Stillwater OK 74078 USA

A

Alex Krasnok

Photonics Initiative Advanced Science Research Center City University of New York New York NY 10031 USA

J

Jiaguang Han

Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 P. R. China

A

Andrea Alù

Department of Electrical and Computer Engineering The University of Texas at Austin Austin TX 78712 USA; Photonics Initiative Advanced Science Research Center City University of New York New York NY 10031 USA; Physics Program Graduate Center City University of New York New York NY 10016 USA

Funding

National Science Foundation

National Natural Science Foundation of China Award: 61605143

Simons Foundation

Air Force Office of Scientific Research

U.S. Department of Defense

Cite This Article

Ziying Zhang, Ming Kang, Xi Feng, et al. (2020). Coherent Perfect Diffraction in Metagratings. Advanced Materials, 32(36). https://doi.org/10.1002/adma.202002341

Coherent Perfect Diffraction in Metagratings

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