In this article, we demonstrate terahertz (THz) electron paramagnetic resonance (EPR) spectroscopy using a frequency-tunable photomixing source/detection system to investigate the electronic structure of solid-state samples in a microscopic manner. Fiber-coupled photoconductive antennae were used to generate and detect continuous THz waves obtained as the beat signals from two laser beams with different wavelengths. We will show some examples of EPR spectroscopy obtained by multi-frequency EPR measurements at room temperature. The technique reported here has several advantages, including high spectral resolution, wide frequency-range operation, high dynamic range, owing to the continuous-wave (cw) and tunable generation/detection of THz waves.In this article, we demonstrate terahertz (THz) electron paramagnetic resonance (EPR) spectroscopy using a frequency-tunable photomixing source/detection system to investigate the electronic structure of solid-state samples in a microscopic manner. Fiber-coupled photoconductive antennae were used to generate and detect continuous THz waves obtained as the beat signals from two laser beams with different wavelengths. We will show some examples of EPR spectroscopy obtained by multi-frequency EPR measurements at room temperature. The technique reported here has several advantages, including high spectral resolution, wide frequency-range operation, high dynamic range, owing to the continuous-wave (cw) and tunable generation/detection of THz waves.

中文翻译：

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使用基于光电导天线的连续波频率可调光混合器的太赫兹电子顺磁共振光谱

在本文中，我们展示了太赫兹 (THz) 电子顺磁共振 (EPR) 光谱，使用频率可调光混合源/检测系统以微观方式研究固态样品的电子结构。光纤耦合光电导天线用于产生和检测连续的太赫兹波，这些波作为来自不同波长的两束激光束的拍频信号而获得。我们将展示一些在室温下通过多频 EPR 测量获得的 EPR 光谱示例。由于连续波 (cw) 和太赫兹波的可调谐生成/检测，这里报告的技术具有几个优点，包括高光谱分辨率、宽频率范围操作、高动态范围。我们展示了太赫兹 (THz) 电子顺磁共振 (EPR) 光谱，使用频率可调的光混合源/检测系统以微观方式研究固态样品的电子结构。光纤耦合光电导天线用于生成和检测连续的太赫兹波，这些波作为来自不同波长的两个激光束的拍频信号而获得。我们将展示一些在室温下通过多频 EPR 测量获得的 EPR 光谱示例。由于连续波 (cw) 和太赫兹波的可调谐生成/检测，这里报告的技术具有几个优点，包括高光谱分辨率、宽频率范围操作、高动态范围。