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Antiferromagnets are promising for magneto-optical light control that could be performed at THz frequencies via excitation of the quasi-antiferromagnetic spin modes. However, most of the antiferromagnetic crystals possess optical anisotropy that is usually treated as an unfavorable condition for the magneto-optical measurements: optical anisotropy is known to diminish the Faraday rotation with respect to the case of the isotropic medium. Here we show that the situation could be quite opposite: a phenomenon of birefringence mediated enhancement of the magneto-optical activity appears if orientation of the incident light linear polarization is chosen properly. The present study relies on the experimental, analytical and numerical studies of iron borate FeBO$_3$ crystals. We demonstrate a significant increase of the magneto-optical activity by more than 10 times for 70$^circ$ angle between light polarization and incidence plane instead of commonly-used p- or s-polarizations. It provides a unique sensitivity to the in-plane magnetization of FeBO$_3$ that is crucial for the pump-probe studies, magneto-optical microscopy and other. The most important practical application of the observed phenomenon is the light modulation with up to 100$%$ efficiency at THz frequencies. The approach is applicable to other types of the birefringent crystals with the magneto-optical response.
We present measurements of the Faraday effect in n-type InSb. The Verdet coefficient was determined for a range of carrier concentrations near $10^{17}$ $text{cm}^{-3}$ in the $lambda$ = 8 $mu$m - 12 $mu$m long-wave infrared regime. The absorption co
One of the long sought-after goals in manipulation of light through light-matter interactions is the realization of magnetic-field-tuneable colouration, so-called magneto-chromatic effect, which holds great promise for optical, biochemical and medica
The origin and properties of the transverse non-reciprocal magneto-optical (nMO) effect were studied. The transverse nMO effect occurs in the case when light propagates perpendicularly to the magnetic field. It was demonstrated that light can experie
We unravel the underlying near-field mechanism of the enhancement of the magneto-optical activity of bismuth-substituted yttrium iron garnet films (Bi:YIG) loaded with gold nanoparticles. The experimental results show that the embedded gold nanoparti
To develop highly sensitive, stable and repeatable surface-enhanced Raman scattering (SERS) substrates is crucial for analytical detection, which is a challenge for traditional metallic structures. Herein, by taking advantage of the high surface acti