Magnetoplasmonic nanocavities for active control of light polarization

Seminar by Terunori Kaihara, Post-doctoral Researcher, Nanomagnetism Group, CIC nanoGUNE

Place: nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian

Date: Monday, 4 September 2023, 11:00

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).
 
See the full list of seminars, here: https://seminars.cfm.ehu.es/

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