Magnetoplasmonic nanocavities for active control of light polarization

CIC nanoGUNE Seminars

Terunori Kaihara
Post-doctoral Researcher, Nanomagnetism Group, CIC nanoGUNE
nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
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Magnetoplasmonic nanocavities for active control of light polarization

Recent research revolves around functional nanophotonic devices, such as active metasurfaces. Integration with magneto-optical (MO) effects enables the control of light polarization in a nonreciprocal manner.[1] To enhance the MO effect, which is small in conventional MO materials at the submicron scale, the plasmon resonance in magnetoplasmonic nanocavities has been exploited, which potentially has MO-induced polarization generation proportional to the square of the quality factor (Q^2) of the resonance. However, the reemission of initial polarization restricts the whole MO enhancement to Q-fold. Our novel approach has employed a low-radiant multipolar dark plasmon mode combined with a dipolar bright mode, which suppresses original polarization while amplifying the MO effect in multipolar Fano resonance modes, significantly boosting MO activity.[2]

The talk will discuss ongoing research focused on optimizing structural designs, hybrid noble/ferromagnetic materials with high magnetic anisotropy, and array configurations for lattice resonance effects for further improvement.

1. Nanophotonics 11(11), 2639–2659 (2022).
2. Light Sci. Appl. 9(1), 49 (2020).