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Related Concept Videos

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...

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Optically Modulated Waveguide-Coupled Spintronic Terahertz Radiation Emitters.

Zhenjie Ge1, Zuanming Jin1,2, Zhuoyi Li3,4,5

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Researchers developed a chip-scale device for generating, modulating, and sensing terahertz (THz) waves. This spintronic THz emitter enables on-chip control and detection, advancing THz technologies.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Terahertz (THz) waves are crucial for communication, imaging, and spectroscopy.
  • Compact and efficient on-chip THz sources are currently limited.

Purpose of the Study:

  • To demonstrate in-situ generation, modulation, and sensing of coherent THz radiation on a single chip.
  • To develop a monolithic platform integrating THz emission and modulation functionalities.

Main Methods:

  • Fabrication of a waveguide-fed spintronic THz emitter with W/Fe/Pt multilayers.
  • Magnetic-field and symmetry-dependent measurements under varying illumination.
  • All-optical modulation via pump polarization control.
  • Numerical simulations to elucidate physical mechanisms.

Main Results:

  • Successful in-situ generation and modulation of broadband THz radiation.
  • Confirmation of spin-to-charge conversion as the emission mechanism.
  • Efficient all-optical modulation achieved by varying pump polarization.
  • Demonstration of on-chip spectroscopic sensing using the device.

Conclusions:

  • A compact and integrable strategy for simultaneous THz wave generation and manipulation has been achieved.
  • The developed spintronic THz emitter shows significant potential for chip-scale THz communication, imaging, and sensing systems.