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Plasmons play a large role in the optical properties of metals. The rapidly developing field of magneto-plasmonics merges the concepts from plasmonics and magnetism to realize novel and unexpected phenomena and functionalities for the manipulation of light at the nanoscale.
Owing to the intertwined optical and magneto-optical properties, magneto-plasmonics may offer a smart toolbox for actively tunable optical ultrathin surfaces and metasurfaces. Here we review fundamentals aspects of the underlying physics [1-3] and recent advances in this emerging research field.
A survey of applications to a variety of emerging technologies are presented as an example of their broad scientific and technological perspectives, namely:
- magneto-plasmonic nanoantennas for ultra-sensitive and label-free molecular detection [4-8];
- ultra-thin 2D chiroptical surfaces, built on magneto-plasmonic bimetallic meta-atoms where chiral light transmission is modulated by the externally applied magnetic field [9];
- 2D magneto-plasmonic crystals, which support collective modes (surface lattice resonances) or surface plasmon polariton modes displaying a two-dimensional photonic band structure that can be engineered to obtain tailored and enhanced magneto-optical response [11-14].
- thermo-plasmonics based on bimetallic magneto-plasmonic nanoantennas, for harvesting electromagnetic radiation energy and convert it into heat, which can be used to finely tune the magnetization reversal in networks of interacting nanomagnets [15].
References
[1] J. Chen et al. Small 7, 2341 (2011)
[2] N. Maccaferri et al., Phys. Rev. Lett. 111, 167401 (2013)
[3] N. Maccaferri et al. Opt. Express 21, 9875 (2013)
[4] V. Bonanni et al. Nano Lett. 11, 5333 (2011)
[5] N. Maccaferri et al., Nature Commun. 6, 6150 (2015)
[6] I. Zubritskaya et al. Nano Lett. 15, 3204 (2015)
[7] R. Verre et al. Nanoscale 8, 10576 (2016)
[8] B. Sepulveda et al., Small 14, 1800868 (2018).
[9] I. Zubritskaya et al., Nano Lett. 18, 302 (2018)
[10] K. Lodewijks et al., Nano Lett. 14, 7207 (2014)
[11] N. Maccaferri et al., Nano Lett. 16, 2533 (2016)
[12] M. Kataia et al., Opt. Express 24, 3652 (2016)
[13] N. Maccaferri et al., ACS Photonics 2, 1769 (2015)
[14] A. López et al., Nanoscale 10, 18672 (2018).
[15] P. Vavassori and M. Pancaldi, Naemi Leo, and P. Vavassori, submitted to ACS Nano.
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