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Coherent Perfect Diffraction in Metagratings.

Ziying Zhang1, Ming Kang2, Xueqian Zhang1

  • 1Center for Terahertz Waves, College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronics Information and Technology, Tianjin University, Tianjin, 300072, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|July 24, 2020
PubMed
Summary

Coherent control of metagratings using multiple wave excitations enables highly reconfigurable broadband metasurfaces. This approach overcomes efficiency limitations of conventional ultrathin metastructures for practical terahertz applications.

Keywords:
coherent controldiffractionmetagratingsterahertz

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Area of Science:

  • Metasurfaces and Nanophotonics
  • Wavefront Engineering
  • Terahertz Technology

Background:

  • Metasurfaces are 2D engineered structures with subwavelength granularity for wavefront tailoring.
  • Fundamental limitations in efficiency due to subwavelength thickness hinder practical applications of conventional metasurfaces.

Purpose of the Study:

  • To demonstrate a novel approach for achieving highly reconfigurable broadband metasurfaces with large diffraction efficiency.
  • To overcome the limitations of conventional ultrathin metastructures using coherent control.

Main Methods:

  • Utilizing coherent control of metagratings through multiple wave excitations.
  • Continuously tuning energy distribution between diffraction orders by adjusting the relative phase difference of excitation waves.
  • Demonstrating the concept on a thin electric metagrating operating at terahertz frequencies.

Main Results:

  • Achieved highly reconfigurable broadband metasurfaces with large diffraction efficiency.
  • Demonstrated continuous tuning of energy distribution between 0th and higher diffraction orders.
  • Showcased enhanced efficiency and bandwidth compared to conventional methods.

Conclusions:

  • Coherent control of metagratings offers a viable strategy to overcome limitations of ultrathin metasurfaces.
  • The proposed method enhances efficiency and bandwidth, extending feasibility for practical terahertz applications.