Optimization of THz Wave Coupling into Samples in DNP/NMR Spectroscopy
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...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Institute of Electrical and Electronics Engineers (IEEE)
2012
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| Online Access: | http://hdl.handle.net/1721.1/73044 https://orcid.org/0000-0003-1589-832X https://orcid.org/0000-0002-1148-9345 https://orcid.org/0000-0001-9813-0177 |
| Summary: | 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. |
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