"Optical nanoantennas for magnetophotonics and beyond"

Nanoscale magnetophotonics unites the concepts from magnetism (switching, storage, steering) with light (energy, information, photochemistry) at the nanoscale [1]. Our own exploration of this merger started some 10 years ago by conceiving nanoscale optical and magnetic antennas with magneto-optical properties dependent on cal resonances [2]. This was boosted by bottom-up nanofabrication we developed early on [3]. Today I highlight our recent work, were we employ plasmon nanoantennas to either funnel electromagnetic energy into ferrimagnetic films at the nanoscale assisting the
demagnetization [3], or construct hybrid plasmon-ferrimagnet nanoantennas for that [4]. The produced architectures could also serve as the conceptually new high-resolution light incidence direction sensors or a platform with multistate demagnetization, potentially opening for nanomagnetic neuromorphic-like ultrafast systems. We also show how adding nanoplasmonics allows to ’see’ single molecule magnets with spectroscopy at ambient conditions [5]. I will discuss a very intriguing prospect of ‘spilling’ materials properties (like electronic interband transition) outside the actual material by strongly coupling electronic and optical resonances in ferromagnetic Ni [6]. Finally, couple of very recent examples of employing optical and magnetic nanoantennas – looking into chemical matter strongly coupled to nanoantennas [7] and proposing a new type of matter – magnetoelectic (Tellegen) materials at optical frequencies [8].

References
[1] N. Maccaferri et al., Nanoscale magnetophotonics, J. Appl. Phys., 127, 080903 (2020).
[2] J. Chen et al., Small 7, 2341 (2011) (journal cover); V. Bonanni et al.,Nano Lett. 11, 5333 (2011).
[3] H. Fredriksson et al., Hole-mask lithography, Adv. Mater. 19, 4297 (2007).
[3] K. Mishra et al., Nanoscale 13, 19367 (2021) (journal cover).
[4] R. M. Rowan-Robinson et al., Adv. Photon. Research 2100119 (2021) (journal cover); K. Mishra et al., Ultrafast demagnetization
control in magnetophotonic surface crystals, Nano Lett. 22, 9773 (2022) (journal cover).
[5] F. Pineider et al., Mater. Horiz., 6, 1148 (2019) (journal cover).
[6] A. Assadillayev et al., Nanoscale engineering of optical strong coupling inside metals, Adv. Optical Mater. 11, 2201971 (2022) (journal cover).
[7] J. Kultruff et al., Sub-ps collapse of molecular polaritons to a single-molecule transition in photoswitch-nanoantennas, Nature Communications 14:3875 (2023).
[8] S. S. Jazi et al., Optical Tellegen metamaterial with spontaneous magnetization, Nature Communications 15: 1293 (2024).

Transmisión en vivo vía biy.ly/YouTube_ICF

Participante: Prof. Alexandre Dmitriev

Institución: Department of Physics, University of Gothenburg, Gothenburg, Sweden

Fecha y hora: Este evento terminó el Jueves, 14 de Marzo de 2024