Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stimulated Brillouin scattering in chiral photonic crystal fiber   Stimulated Brillouin scattering (SBS) has many applications, for example, in
sensing, microwave photonics and signal processing. Here we report the first
experimental study of SBS in chiral photonic crystal fiber (PCF), which
displays optical activity and robustly maintains circular polarization states
against external perturbations. As a result, circularly polarized pump light is
cleanly back-scattered into a Stokes signal with the orthogonal circular
polarization state, as is required by angular momentum conservation. By
comparison, untwisted PCF generates a Stokes signal with an unpredictable
polarization state, owing to its high sensitivity to external perturbations. We
use chiral PCF to realize a circularly polarized continuous-wave Brillouin
laser. The results pave the way to a new generation of stable circularly
polarized SBS systems with applications in quantum manipulation, optical
tweezers, optical gyroscopes and fiber sensors.

11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg