Brillouin Light Scattering by Magnetic Quasivortices in Cavity Optomagnonics.
Alto Osada,Arnaud Gloppe,Ryusuke Hisatomi,Atsushi Noguchi,Rekishu Yamazaki,Masahiro Nomura,Yasunobu Nakamura,Yasunobu Nakamura,Koji Usami +8 more
TLDR
Brillouin scattering of photons in the whispering gallery modes by magnons in the magnetostatic modes is experimentally investigated, finding that the conservation of the orbital angular momentum results in different nonreciprocal behavior in the Brillouin light scattering.Abstract:
A ferromagnetic sphere can support optical vortices in the form of whispering gallery modes and magnetic quasivortices in the form of magnetostatic modes with nontrivial spin textures. These vortices can be characterized by their orbital angular momenta. We experimentally investigate Brillouin scattering of photons in the whispering gallery modes by magnons in the magnetostatic modes, zeroing in on the exchange of the orbital angular momenta between the optical vortices and magnetic quasivortices. We find that the conservation of the orbital angular momentum results in different nonreciprocal behavior in the Brillouin light scattering. New avenues for chiral optics and optospintronics can be opened up by taking the orbital angular momenta as a new degree of freedom for cavity optomagnonics.read more
Citations
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