title: Monolithic MACS micro resonators.
abstract: Magic Angle Coil Spinning (MACS) aids improving the intrinsically low NMR sensitivity of heterogeneous microscopic samples. We report on the design and testing of a new type of monolithic 2D MACS resonators to overcome known limitations of conventional micro coils. The resonators' conductors were printed on dielectric substrate and tuned without utilizing lumped element capacitors. Self-resonance conditions have been computed by a hybrid FEM-MoM technique. Preliminary results reported here indicate robust mechanical stability, reduced eddy currents heating and negligible susceptibility effects. The gain in B1/P is in agreement with the NMR sensitivity enhancement according to the principle of reciprocity. A sensitivity enhancement larger than 3 has been achieved in a monolithic micro resonator inside a standard 4mm rotor at 500MHz. These 2D resonators could offer higher performance micro-detection and ease of use of heterogeneous microscopic substances such as biomedical samples, microscopic specimens and thin film materials.
authors.affiliation: NIMBE, CEA-CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France.
authors.forename: J A
authors.initials: JA
authors.lastname: Lehmann-Horn
authors.affiliation: NIMBE, CEA-CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France.
authors.forename: J-F
authors.initials: JF
authors.lastname: Jacquinot
authors.affiliation: Laboratoire d'Imagerie par Résonance Magnétique Médicale et Multi-Modalités (IR4M), UMR8081, CNRS, Université Paris-Sud, Université Paris Saclay, Orsay, France.
authors.forename: J C
authors.initials: JC
authors.lastname: Ginefri
authors.affiliation: Sorbonne Universités, UPMC Université Paris 06, UMR CNRS 7574, Laboratoire de Chimie de la Matière Condensée de Paris, Collège de France, 4 place Jussieu, 75252 Paris Cedex 05, France.
authors.forename: C
authors.initials: C
authors.lastname: Bonhomme
authors.affiliation: NIMBE, CEA-CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France. Electronic address: dsakellariou@cea.fr.
authors.forename: D
authors.initials: D
authors.lastname: Sakellariou
keywords: MR microscopy; Magic angle coil spinning; Micro NMR detection; Microscopic sample NMR; Transmission line resonator