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A microwave resonator integrated on a polymer microfluidic chip

Kiss, S.Z.; Rostas, A.M.; Heidinger, L.; Spengler, N.; Meissner, M.V.; MacKinnon, N.; Schleicher, E.; Weber, S.; Korvink, J.G.

Abstract (englisch): We describe a novel stacked split-ring type microwave (MW) resonator that is integrated into a 10 mm by 10 mm sized microfluidic chip. A straightforward and scalable batch fabrication process renders the chip suitable for single-use applications. The resonator volume can be conveniently loaded with liquid sample via microfluidic channels patterned into the mid layer of the chip. The proposed MW resonator offers an alternative solution for compact in-field measurements, such as low-field magnetic resonance (MR) experiments requiring convenient sample exchange. A microstrip line was used to inductively couple MWs into the resonator. We characterised the proposed resonator topology by electromagnetic (EM) field simulations, a field perturbation method, as well as by return loss measurements. Electron paramagnetic resonance (EPR) spectra at X-band frequencies were recorded, revealing an electron-spin sensitivity of View the MathML source3.7·1011spins·Hz-1/2G-1 for a single EPR transition. Preliminary time-resolved EPR experiments on light-induced triplet states in pentacene were performed to estimate the MW conversion efficiency of the resonator.

Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1016/j.jmr.2016.07.008
ISSN: 0022-2364, 1090-7807, 1096-0856, 1557-8968
URN: urn:nbn:de:swb:90-586580
KITopen ID: 1000058658
HGF-Programm 43.22.01; LK 01
Erschienen in Journal of magnetic resonance
Band 270
Seiten 169-175
Schlagworte EPR; ESR; Resonator; Stacked resonator; Resonator modes; Small-volume EPR; Microfluidic; Fluidic chip; Spin nutation; Transient EPR
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