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Plasmonic Metasurface Resonators to Enhance Terahertz Magnetic Fields for High‐Frequency Electron Paramagnetic Resonance
Author(s) -
Tesi Lorenzo,
Bloos Dominik,
Hrtoň Martin,
Beneš Adam,
Hentschel Mario,
Kern Michal,
Leavesley Alisa,
Hillenbrand Rainer,
Křápek Vlastimil,
Šikola Tomáš,
Slageren Joris
Publication year - 2021
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202100376
Subject(s) - resonator , terahertz radiation , spintronics , plasmon , materials science , optoelectronics , electron paramagnetic resonance , nanotechnology , nuclear magnetic resonance , physics , condensed matter physics , ferromagnetism
Nanoscale magnetic systems play a decisive role in areas ranging from biology to spintronics. Although, in principle, THz electron paramagnetic resonance (EPR) provides high‐resolution access to their properties, lack of sensitivity has precluded realizing this potential. To resolve this issue, the principle of plasmonic enhancement of electromagnetic fields that is used in electric dipole spectroscopies with great success is exploited, and a new type of resonators for the enhancement of THz magnetic fields in a microscopic volume is proposed. A resonator composed of an array of diabolo antennas with a back‐reflecting mirror is designed and fabricated. Simulations and THz EPR measurements demonstrate a 30‐fold signal increase for thin film samples. This enhancement factor increases to a theoretical value of 7500 for samples confined to the active region of the antennas. These findings open the door to the elucidation of fundamental processes in nanoscale samples, including junctions in spintronic devices or biological membranes.