Huber, Markus A. and Mooshammer, Fabian and Plankl, Markus and Viti, Leonardo and Sandner, Fabian and Kastner, Lukas Z. and Frank, Tobias and Fabian, Jaroslav and Vitiello, Miriam S. and Cocker, Tyler L. and Huber, Rupert (2017) Femtosecond photo-switching of interface polaritons in black phosphorus heterostructures. NATURE NANOTECHNOLOGY, 12 (3). 207-+. ISSN 1748-3387, 1748-3395
Full text not available from this repository. (Request a copy)Abstract
The possibility of hybridizing collective electronic motion with mid-infrared light to form surface polaritons has made van der Waals layered materials a versatile platform for extreme light confinement(1-5) and tailored nanophotonics(6-8). Graphene(9,10) and its heterostructures(11-14) have attracted particular attention because the absence of an energy gap allows plasmon polaritons to be tuned continuously. Here, we introduce black phosphorus(15-19) as a promising new material in surface polaritonics that features key advantages for ultrafast switching. Unlike graphene, black phosphorus is a van der Waals bonded semiconductor, which enables high-contrast interband excitation of electron-hole pairs by ultrashort near-infrared pulses. Here, we design a SiO2/black phosphorus/SiO2 heterostructure in which the surface phonon modes of the SiO2 layers hybridize with surface plasmon modes in black phosphorus that can be activated by photo-induced interband excitation. Within the Reststrahlen band of SiO2, the hybrid interface polariton assumes surface-phonon-like properties, with a well-defined frequency and momentum and excellent coherence. During the lifetime of the photogenerated electron-hole plasma, coherent hybrid polariton waves can be launched by a broadband mid-infrared pulse coupled to the tip of a scatteringtype scanning near-field opticalmicroscopy set-up. The scattered radiation allows us to trace the new hybrid mode in time, energy and space. We find that the surface mode can be activated within similar to 50 fs and disappears within 5 ps, as the electron-hole pairs in black phosphorus recombine. The excellent switching contrast and switching speed, the coherence properties and the constant wavelength of this transient mode make it a promising candidate for ultrafast nanophotonic devices.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GRAPHENE PLASMONS; PHONON-POLARITONS; BORON-NITRIDE; TERAHERTZ; ULTRAFAST; TRANSISTORS; NANOSCOPY; NANOPHOTONICS; PASSIVATION; CRYSTALS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:01 |
| Last Modified: | 25 Feb 2019 11:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/354 |
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