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Magnetic Lenz lenses improve the limit-of-detection in nuclear magnetic resonance

Spengler, N. 1; While, P. T.; Meissner, M. V. ORCID iD icon 1; Wallrabe, U.; Korvink, J. G. 1
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


A high NMR detection sensitivity is indispensable when dealing with mass and volume-limited
samples, or whenever a high spatial resolution is required. The use of miniaturised RF
coils is a proven way to increase sensitivity, but situations may arise where space restrictions
could prevent the use of a small resonant coil, e.g., in the interior of the smallest practicable
micro-coils. We present the use of magnetic lenses, denoted as Lenz lenses due to
their working principle, to focus the magnetic flux of an RF coil into a smaller volume and
thereby locally enhance the sensitivity of the NMR experimentÐat the expense of the total
sensitive volume. Besides focusing, such lenses facilitate re-guiding or re-shaping of magnetic
fields much like optical lenses do with light beams. For the first time we experimentally
demonstrate the use of Lenz lenses in magnetic resonance and provide a compact mathematical
description of the working principle. Through simulations we show that optimal
arrangements can be found.

Verlagsausgabe §
DOI: 10.5445/IR/1000073936
Veröffentlicht am 02.11.2017
DOI: 10.1371/journal.pone.0182779
Zitationen: 19
Web of Science
Zitationen: 15
Zitationen: 29
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 1932-6203
KITopen-ID: 1000073936
HGF-Programm 47.01.03 (POF III, LK 01) Biol.Netzwerke u.Synth.Regulat. IMT
Erschienen in PLoS one
Verlag Public Library of Science (PLoS)
Band 12
Heft 8
Seiten Art. Nr.: e0182779
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 15.08.2017
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