Plasmonic Metasurface Resonators to Enhance Terahertz Magnetic Fields for High-Frequency Electron Paramagnetic Resonance
| Autor: | Rainer Hillenbrand, D. Bloos, Alisa Leavesley, Tomáš Šikola, Vlastimil Křápek, Joris van Slageren, Martin Hrtoň, Mario Hentschel, Lorenzo Tesi, Michal Kern, Adam Beneš |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
plasmonic metasurfaces Terahertz radiation THz EPR 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Resonator Electromagnetic Fields law nanostructures Nanotechnology General Materials Science Computer Simulation Electron paramagnetic resonance Plasmon spintronics thin layers Thin layers Spintronics business.industry self-assembled monolayers Electron Spin Resonance Spectroscopy Self-assembled monolayer General Chemistry Equipment Design 021001 nanoscience & nanotechnology Plasmon enhancement 2D resonators 0104 chemical sciences Magnetic field microresonators electron paramagnetic resonance Magnetic field enhancement Optoelectronics 0210 nano-technology business EPR spectroscopy |
| Zdroj: | Small Methods. 2021, vol. 5, issue 9, p. 2100376-2100376. Small Methods |
| ISSN: | 2366-9608 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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