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Optimization of THz wave coupling into samples in DNP/NMR spectroscopy

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7 Author(s)
Nanni, E.A. ; Plasma Sci. & Fusion Center, MIT, Cambridge, MA, USA ; Barnes, A.B. ; Matsuki, Y. ; Woskov, P.P.
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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 B1 value of 13 μT/W1/2. 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 B1 value. Methods of optimizing the B1 value are described.

Published in:

Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010 35th International Conference on

Date of Conference:

5-10 Sept. 2010