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<p>In this review, we present a novel technique for terahertz (THz) electron spin resonance (ESR) spectroscopy using broadband frequency-tunable photomixers. These photomixers offer unique advantages, such as continuous and broadband frequency tunability, enabling high-resolution ESR spectroscopy in the THz region. Our technique can be applied to both field- and frequency-swept ESR setups, covering a wide frequency range of up to 1.1 THz and magnetic fields of up to 10 T. We also demonstrate an application to antiferromagnetic resonance spectroscopy. A comparison is made with other frequency-domain ESR techniques using continuous-wave and pulsed THz sources to emphasize the characteristics of our technique.</p>

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Terahertz Electron Spin Resonance Spectroscopy Using Broadband Frequency-Tunable Photomixers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月3日

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  • Eiji Ohmichi,
  • Yuto Shoji,
  • Hitoshi Ohta

摘要

In this review, we present a novel technique for terahertz (THz) electron spin resonance (ESR) spectroscopy using broadband frequency-tunable photomixers. These photomixers offer unique advantages, such as continuous and broadband frequency tunability, enabling high-resolution ESR spectroscopy in the THz region. Our technique can be applied to both field- and frequency-swept ESR setups, covering a wide frequency range of up to 1.1 THz and magnetic fields of up to 10 T. We also demonstrate an application to antiferromagnetic resonance spectroscopy. A comparison is made with other frequency-domain ESR techniques using continuous-wave and pulsed THz sources to emphasize the characteristics of our technique.