Magneto-Optical Activity in Nonmagnetic Hyperbolic Nanoparticles.

Joel Kuttruff,Esteban Pedrueza-Villalmanzo,Daniele Brida,Giuseppe Strangi,Yingqi Zhao,Marzia Iarossi,Francesco De Angelis,Francesco Pineider,Antonietta Parracino,Gaia Petrucci,Alexandre Dmitriev,Nicolò Maccaferri,Alessio Gabbani

doi:10.1103/physrevlett.127.217402

Abstract

Active nanophotonics can be realized by controlling the optical properties of materials with external magnetic fields. Here, we explore the influence of optical anisotropy on the magneto-optical activity in nonmagnetic hyperbolic nanoparticles. We demonstrate that the magneto-optical response is driven by the hyperbolic dispersion via the coupling of metallic-induced electric and dielectric-induced magnetic dipolar optical modes with static magnetic fields. Magnetic circular dichroism experiments confirm the theoretical predictions and reveal tunable magneto-optical activity across the visible and near infrared spectral range.

Highlights

Active nanophotonics can be realized by controlling the optical properties of materials with external magnetic fields
We explore the influence of optical anisotropy on the magneto-optical activity in nonmagnetic hyperbolic nanoparticles
Achieved, often described by hyperbolic isofrequency surfaces ðεkε⊥ < 0Þ, which are opposed to the elliptical ones observed in typical materials like pure metals or dielectrics. This optical anisotropy can be further exploited to enhance the MO response of a material [18,19,20,21], allowing to control the optical properties by applying an external magnetic field, which is fundamental in view of the development of active magnetophotonic devices [22,23,24,25,26,27], from sensing [28,29,30,31,32], and all-optical switching [33,34], to nonreciprocal light propagation [35,36,37,38] and polarization selection [39,40]

Summary

Introduction

Active nanophotonics can be realized by controlling the optical properties of materials with external magnetic fields. We demonstrate that the magneto-optical response is driven by the hyperbolic dispersion via the coupling of metallic-induced electric and dielectric-induced magnetic dipolar optical modes with static magnetic fields.

Results

Conclusion