Optical isolation in magnetoplasmonic diffraction gratings

Rafael Cichelero; Mikko Kataja; Gervasi Herranz

doi:10.1117/12.2528693

16 September 2019 Optical isolation in magnetoplasmonic diffraction gratings

Rafael Cichelero, Mikko Kataja, Gervasi Herranz

Author Affiliations +

Proceedings Volume 11090, Spintronics XII; 1109039 (2019) https://doi.org/10.1117/12.2528693
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

Magnetoplasmonic gratings offer a suitable platform to analyze fundamental aspects of the interaction of plasmons with magnetization. In particular, broken time-reversal symmetry induces frequency shifts in plasmon resonances that result in large magneto-optic responses at the plasmon frequency. Here we study the excitation of plasmons with light at oblique incidence, focusing on the effect of plasmon excitation on the diffracted modes of the gratings. This way, we were able to select one of the two counterpropagating plasmons allowed for each diffraction order. Interestingly, in these conditions we found large magneto-optic amplitudes driven by plasmons near grating diffraction modes. Finite-difference timedomain simulations confirm these experimental results and corroborate that the sign of the magneto-optic enhancement is exclusively dependent on the surface plasmon wavevector and does not depends on the angle of incidence.

Conference Presentation

Citation Download Citation

Rafael Cichelero, Mikko Kataja, and Gervasi Herranz "Optical isolation in magnetoplasmonic diffraction gratings", Proc. SPIE 11090, Spintronics XII, 1109039 (16 September 2019); https://doi.org/10.1117/12.2528693

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