Optimization of THz Wave Coupling into Samples in DNP/NMR Spectroscopy
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High power millimeter wave and terahertz sources are used in DNP/NMR spectroscopy to greatly enhance the NMR signal. A key issue is the efficient coupling of the source power to the sample. We present HFSS calculations showing that the MIT 250 GHz DNP/NMR system provides a B[subscript 1] value of 13 μT/W[superscript 1/2]. The simulation shows the importance of the diffraction of radiation passing through the RF coil, leading to non-uniform illumination of the sample. A simple single pass model yields insight into the origin of the observed B[subscript 1] value. Methods of optimizing the B[subscript 1] value are described.
Date issued
2010-10Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Plasma Science and Fusion Center; Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)Journal
Proceedings of the 35th International Conference on Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Barnes, Alexander et al. "Optimization of THz wave coupling into samples in DNP/NMR spectroscopy." Proceedings of the 2010 IEEE International Conference on Millimeter and Terahertz Waves: 1-3. © Copyright IEEE
Version: Final published version
ISBN
978-1-4244-6655-9