Large evanescently-induced Brillouin scattering at the surrounding of a nanofibre
| Autor: | Yang, Fan, Gyger, Flavien, Godet, Adrien, Chrétien, Jacques, Zhang, Li, Pang, Meng, Beugnot, Jean-Charles, Thévenaz, Luc |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Nature Communications, 13:1432 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41467-022-29051-8 |
| Popis: | Brillouin scattering has been widely exploited for advanced photonics functionalities such as microwave photonics, signal processing, sensing, lasing, and more recently in micro- and nano-photonic waveguides. So far, all the works have focused on the opto-acoustic interaction driven from the core region of micro- and nano-waveguides. Here we observe, for the first time, an efficient Brillouin scattering generated by an evanescent field nearby a sub-wavelength waveguide embedded in a pressurised gas cell, with a maximum gain coefficient of $18.90 \pm 0.17$ m$^{-1}$W$^{-1}$. This gain is 11 times larger than the highest Brillouin gain obtained in a hollow-core fibre and 79 times larger than in a standard single-mode fibre. The realisation of strong free-space Brillouin scattering from a waveguide benefits from the flexibility of confined light while providing a direct access to the opto-acoustic interaction, as required in free-space optoacoustics such as Brillouin spectroscopy and microscopy. Therefore, our work creates an important bridge between Brillouin scattering in waveguides, Brillouin spectroscopy and microscopy, and opens new avenues in light-sound interactions, optomechanics, sensing, lasing and imaging. Comment: Main manuscript: 8 pages, 6 figures; Supplementary: 5 pages, 3 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|