4.8 Article

Light-Driven Spintronic Heterostructures for Coded Terahertz Emission

Journal

ACS NANO
Volume 16, Issue 5, Pages 8294-8300

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c02160

Keywords

coded terahertz emission; ferromagnetic heterostructures; spintronic; inverse spin Hall effect; light-driven

Funding

  1. National Natural Science Foundation of China [62075240]
  2. Scientific Research Foundation of the National University of Defense Technology [ZK18-03-22, ZK18-01-03, ZK18-0336]
  3. Science Fund for Distinguished Young Scholars of Hunan Province [2020JJ2036]

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This study proposes and experimentally validates coded terahertz emission, which achieves efficient generation and control of terahertz waves in the terahertz frequency band. By utilizing stripe-patterned ferromagnetic heterostructures as coding units, the states of the coding units can be switched by manipulating the optical field distribution, enabling terahertz coding and emission.
The extraordinary proliferation of digital coding metasurfaces turns the real-time manipulation of electromagnetic (EM) waves into reality and promotes the programmable operation of multifunctional equipment. However, current studies are mainly involved in the modulation of the transmission process, and little attention has been given to the control of EM wave generation, especially in the terahertz (THz) band. Here, we conceptually propose and experimentally demonstrate coded terahertz emission, which integrates the efficient generation and control of THz waves across a wide frequency band. For validation, two types of stripe-patterned ferromagnetic heterostructures with opposite spin Hall angles were utilized as coding units. The two distinct states in each coding unit (with two polarization or phase states of 0 degrees and 180 degrees) can be characterized as 0 and 1 digits, which can be switched by manipulating the optical field distribution of the pump beam. Such an ability to realize simultaneous terahertz coding and terahertz emission is essential for meeting the increasingly demanding requirements of integration and miniaturization. Our work endows ferromagnetic heterostructures with controllable spatial characteristics and benefits their applications in wireless communications and holographic imaging.

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