Interplay and coupling of electric and magnetic multipole resonances in plasmonic nanoparticle lattices
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Prospective Article
Interplay and coupling of electric and magnetic multipole resonances in plasmonic nanoparticle lattices Viktoriia E. Babicheva, University of Arizona, 1630 E. University Blvd., P.O. Box 210094, Tucson, AZ 85721 Andrey B. Evlyukhin, ITMO University, 49 Kronverksky Ave., St. Petersburg 197101, Russia; Laser Zentrum Hannover e.V., Hollerithallee 8, Hannover D-30419, Germany Address all correspondence to Viktoriia E. Babicheva at [email protected] (Received 22 February 2018; accepted 15 June 2018)
Abstract Lattice resonances in nanoparticle arrays recently have gained a lot of attention because of the possibility to produce spectrally narrow resonant features in transmission and reflection as well as significantly increase absorption in the structures. Most of the efforts so far have been put to study these lattice resonances in dipole approximation. However, the recent research shows that higher multipoles not only produce resonant feature but are also involved in cross-coupling, affect each other, and induce a magnetoelectric response. In the present paper, we review the recent achievements in studying interplay and coupling of different multipoles in periodic nanoparticle arrays and share our vision on further progress of the field.
Introduction Nanoparticles exhibit a variety of interesting optical properties.[1] Plasmonic particles support resonances of localized surface plasmons, which result in high field concentration in the proximity of the particles and more efficient manipulation of light at the nanoscale. Nanoparticle assembles, like oligomers and clusters, support a broad range of resonances[2]; their interplay causes sharp features in the spectra, including the so-called Fano resonances,[3] and consequently can be utilized in functional optical elements and metasurfaces. It has been shown that subwavelength plasmonic structures can enhance light–matter interaction[4, 5] and open up possibilities of a wide range of applications such as optical antennas,[1] photovoltaics,[6, 7] scattering-type near-field optical microscopy,[8] and others. Particles arranged in periodic lattices enable even more fascinating properties, and the most prominent effects happen when the period of the array is comparable with the wavelength of nanoparticle resonance. Being in the proximity of singleparticle resonance maximum, these lattice resonances strongly modify the spectral profile,[9–15] but for an offset to the red part of the single-particle resonance, the lattice resonances appear as additional separate features (Fig. 1). Field enhancement and more efficient scattering that results from lattice resonance excitations[16–21] can find applications in sensors,[22] nanolasers,[23] light harvesting devices,[24, 25] modulators,[26] and others. The broad variety of enabled functionalities are highlighted in the recent review,[27] dipole coupling of multiple particles in the cell,[28] and multipolar interactions in the surface-lattice resonances in two-dimensional arrays of spheres.[29, 30] Different
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