Macor, A.De Rijk, E.Alberti, S.Comment, A.Ansermet, J.-Ph2012-05-092012-05-092012-05-09201110.1109/irmmw-THz.2011.6104946https://infoscience.epfl.ch/handle/20.500.14299/80185By shining mm-waves upon a sample containing unpaired electron spins, DNP provides a way to enhance NMR signals. We report the characterization of a universal polarizer for EM-waves at 140 GHz made by rectangular grooved mirrors as well as design considerations for optimizing the coupling of a millimeter wave Gaussian beam to DNP/NMR samples. © 2011 IEEE.text::conference output::conference proceedings::conference paper