Optical Manipulation of a Magnon-Photon Hybrid System.
We demonstrate an all-optical method for manipulating the magnetization in a 1-mm yttrium-iron-garnet (YIG) sphere placed in a ∼0.17  T uniform magnetic field. A harmonic of the frequency comb delivered by a multi-GHz infrared laser source is tuned to the Larmor frequency of the YIG sphere to drive magnetization oscillations, which in turn give rise to a radiation field used to thoroughly investigate the phenomenon. The radiation damping issue that occurs at high frequency and in the presence of highly magnetizated materials has been overcome by exploiting the magnon-photon strong coupling regime in microwave cavities. Our findings demonstrate an effective technique for ultrafast control of the magnetization vector in optomagnetic materials via polarization rotation and intensity modulation of an incident laser beam. We eventually get a second-order susceptibility value of ∼10^{-7}  cm^{2}/MW for single crystal YIG.
Dip. di Fisica e Astronomia and INFN, Sez di Padova, Via F. Marzolo 8, I-35131 Padova, Italy.
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Braggio
Dip. di Fisica e Astronomia and INFN, Sez di Padova, Via F. Marzolo 8, I-35131 Padova, Italy.
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Carugno
Dip. di Fisica e Astronomia and INFN, Sez di Padova, Via F. Marzolo 8, I-35131 Padova, Italy.
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Guarise
INFN, Laboratori Nazionali di Legnaro, Viale dell'Università 2, I-35020 Legnaro, Italy.
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Ortolan
INFN, Laboratori Nazionali di Legnaro, Viale dell'Università 2, I-35020 Legnaro, Italy.
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Ruoso