Rathje, Christopher and von Seggern, Rieke and Graeper, Leon A. and Kredl, Jana and Walowski, Jakob and Muenzenberg, Markus and Schaefer, Sascha (2023) Coupling Broadband Terahertz Dipoles to Microscale Resonators. ACS PHOTONICS, 10 (10). pp. 3467-3475. ISSN 2330-4022
Full text not available from this repository.Abstract
Optically driven spintronic emitters are a unique class of terahertz (THz) sources due to their quasi-two-dimensional geometry and thereby their capability to effectively couple to resonator near fields. Global excitation of the emitters often obstructs the intricate details of the coupling mechanisms between local THz dipoles and the individual modes of resonator structures. Here, we demonstrate the spatial mapping of the coupling strength between a micrometer-scale terahertz source on a spintronic emitter and far-field light mediated by a structured metallic environment. For a bow-tie geometry, experimental results are reproduced by a numerical model, providing insights into the microscopic coupling mechanisms. The broad applicability of the technique is showcased by extracting the THz mode structure in split-ring resonator metasurfaces and linear arrays. With these developments, planar THz sources with tailored spectral and angular emission profiles become accessible.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CURRENT PULSES; SPIN CURRENT; EMISSION; RADIATION; EMITTERS; spintronic THz emitter; split-ring resonator; bow-tie resonator; photonic mode mapping; electro-opticsampling; localized excitation |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Feb 2024 05:40 |
| Last Modified: | 28 Feb 2024 05:40 |
| URI: | https://pred.uni-regensburg.de/id/eprint/59118 |
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