Electronic Characterization of Lithographically Patterned Microcoils for High Sensitivity NMR Detection

Demas, V; Bernhardt, A; Malba, V; Adams, K L; Evans, L; Harvey, C; Maxwell, R S; Herberg, J L

doi:10.1016/j.jmr.2009.06.003

Electronic Characterization of Lithographically Patterned Microcoils for High Sensitivity NMR Detection

Journal Article · Mon Jan 12 23:00:00 EST 2009 · Journal of Magnetic Resonance

DOI:https://doi.org/10.1016/j.jmr.2009.06.003· OSTI ID:966568

Demas, V; Bernhardt, A; Malba, V; Adams, K L; Evans, L; Harvey, C; Maxwell, R S; Herberg, J L

Nuclear magnetic resonance (NMR) offers a non-destructive, powerful, structure-specific analytical method for the identification of chemical and biological systems. The use of radio frequency (RF) microcoils has been shown to increase the sensitivity in mass limited samples. Recent advances in micro-receiver technology have further demonstrated a substantial increase in mass sensitivity [1]. Lithographic methods for producing solenoid microcoils possess a level of flexibility and reproducibility that exceeds previous production methods, such as hand winding microcoils. This paper presents electrical characterizations of RF microcoils produced by a unique laser lithography system that can pattern three dimensional surfaces and compares calculated and experimental results to those for wire wound RF microcoils. We show that existing optimization conditions for RF coil design still hold true for RF microcoils produced by lithography. Current lithographic microcoils show somewhat inferior performance to wire wound RF microcoils due to limitations in the existing electroplating technique. In principle, however, when the pitch of the RF microcoil is less than 100 {micro}m lithographic coils should show comparable performance to wire wound coils. In the cases of larger pitch, wire cross sections can be significantly larger and resistances lower than microfabricated conductors.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 966568

Report Number(s):: LLNL-JRNL-413292

Journal Information:: Journal of Magnetic Resonance, Journal Name: Journal of Magnetic Resonance Journal Issue: 1 Vol. 200; ISSN 1090-7807; ISSN JMARF3

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CROSS SECTIONS
DESIGN
DETECTION
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FLEXIBILITY
LASERS
NUCLEAR MAGNETIC RESONANCE
OPTIMIZATION
PERFORMANCE
PRODUCTION
SENSITIVITY
SOLENOIDS
WOUNDS

Electronic Characterization of Lithographically Patterned Microcoils for High Sensitivity NMR Detection

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