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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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Extremely frequency-widened terahertz wave generation using Cherenkov-type radiation.

Koji Suizu1, Kaoru Koketsu, Takayuki Shibuya

  • 1Department of Electrical Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. suizu@nuee.nagoya-u.ac.jp

Optics Express
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Summary

Researchers developed a novel Cherenkov radiation waveguide for efficient terahertz (THz) wave generation. This method achieves an extremely wide tunable frequency range, surpassing previous technologies for THz sources.

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Area of Science:

  • Nonlinear optics
  • Terahertz (THz) science and technology
  • Materials science

Background:

  • Efficient and tunable terahertz (THz) wave generation is crucial for various applications.
  • Existing methods are limited by nonlinear crystal properties, particularly THz absorption.
  • Novel strategies are needed to overcome these limitations for broader THz wave generation.

Purpose of the Study:

  • To demonstrate Cherenkov radiation with a waveguide structure as an effective strategy for efficient and extremely wide tunable THz-wave generation.
  • To overcome the limitations of nonlinear crystal absorption in the THz frequency region.
  • To achieve a tunable monochromatic bright THz-wave source.

Main Methods:

  • Fabrication of a MgO-doped lithium niobate slab waveguide with a thickness of 3.8 micrometers.
  • Demonstration of difference frequency generation of THz-wave using Cherenkov phase matching within the waveguide.
  • Characterization of the generated THz-wave's frequency range and energy output.

Main Results:

  • Achieved extremely wide frequency-widened THz-wave generation from 0.1 to 7.2 THz without structural dips.
  • Demonstrated a significantly wider tuning frequency range compared to injection-seeded-Terahertz Parametric Generators.
  • Obtained the widest THz-wave generation tuning range reported to date using lithium niobate.
  • Recorded the highest THz-wave energy of approximately 3.2 pJ with an energy conversion efficiency of about 10(-5) %.

Conclusions:

  • Cherenkov radiation in a waveguide structure is a highly effective strategy for efficient and ultra-broadband THz-wave generation.
  • This method overcomes the absorption limitations of conventional nonlinear crystals in the THz region.
  • The technique is adaptable to various nonlinear crystals, enabling the development of simple, compact, and high-efficiency THz sources.