Abstract
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.
Highlights
IntroductionElectron paramagnetic resonance (EPR) spectroscopy is a well- the third power of the wavelength, they are too small for use established technique for investigating systems with unpaired in high-frequency EPR (HFEPR).[1] 3D Fabry–Pérot resonators are more amenable to electrons
Introduction the measurement sensitivitySingle-mode cavities are the most used resonators but, since their dimensions scale withElectron paramagnetic resonance (EPR) spectroscopy is a well- the third power of the wavelength, they are too small for use established technique for investigating systems with unpaired in high-frequency employing higher magnetic fields and resonance (EPR) (HFEPR).[1] 3D Fabry–Pérot resonators are more amenable to electrons
Electron paramagnetic resonance (EPR) spectroscopy is a well- the third power of the wavelength, they are too small for use established technique for investigating systems with unpaired in HFEPR.[1] 3D Fabry–Pérot resonators are more amenable to electrons
Summary
Electron paramagnetic resonance (EPR) spectroscopy is a well- the third power of the wavelength, they are too small for use established technique for investigating systems with unpaired in HFEPR.[1] 3D Fabry–Pérot resonators are more amenable to electrons. It is widely applied in research areas including chem- high-frequency applications; their employment is limistry, physics, medicine, biology, and materials science.[1,2] To ited by drawbacks such as high resistive losses and low filling enhance absolute sensitivity, spectral resolution and access factors.[1,7] For these reasons, and because bulk samples often.
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