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Updated: Mar 16, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
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Monolithic MACS micro resonators.

J A Lehmann-Horn1, J-F Jacquinot1, J C Ginefri2

  • 1NIMBE, CEA-CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 22, 2016
PubMed
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This study introduces novel 2D Magic Angle Coil Spinning (MACS) resonators for enhanced NMR sensitivity in microscopic samples. These new resonators achieve over 3x sensitivity gain, improving micro-detection of diverse materials.

Area of Science:

  • Magnetic Resonance Imaging
  • Materials Science
  • Electrical Engineering

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy suffers from low sensitivity with microscopic and heterogeneous samples.
  • Conventional microcoils used in Magic Angle Coil Spinning (MACS) have limitations that hinder sensitivity improvements.

Purpose of the Study:

  • To design and test a new monolithic 2D MACS resonator to overcome limitations of conventional microcoils.
  • To enhance NMR sensitivity for microscopic samples, enabling better analysis of heterogeneous substances.

Main Methods:

  • Developed monolithic 2D MACS resonators with conductors printed on a dielectric substrate.
  • Tuned resonators without lumped element capacitors, using a hybrid FEM-MoM technique for self-resonance computation.
Keywords:
MR microscopyMagic angle coil spinningMicro NMR detectionMicroscopic sample NMRTransmission line resonator

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  • Tested resonators for mechanical stability, eddy currents heating, and susceptibility effects.

    • Main Results:

    • Achieved a sensitivity enhancement factor greater than 3 at 500MHz within a standard 4mm rotor.
    • Demonstrated robust mechanical stability, reduced eddy currents heating, and negligible susceptibility effects.
    • Observed B1/P gain consistent with NMR sensitivity enhancement via the principle of reciprocity.

    Conclusions:

    • The new monolithic 2D MACS resonators offer improved performance and ease of use for micro-detection.
    • These resonators are suitable for analyzing heterogeneous microscopic substances like biomedical samples, specimens, and thin films.
    • The design overcomes limitations of conventional microcoils, paving the way for higher-performance NMR applications.