Magnetic circular dichroism of non-local surface lattice resonances in magnetic nanoparticle arrays

被引：17
作者：
Kataja, Mikko [1 ]
Pourjamal, Sara [1 ]
van Dijken, Sebastiaan [1 ]
机构：
[1] Aalto Univ, Dept Appl Phys, NanoSpin, Sch Sci, FI-00076 Aalto, Finland
来源：
OPTICS EXPRESS | 2016年 / 24卷 / 04期
基金：
芬兰科学院;
关键词：
MAGNETOOPTICAL ACTIVITY; OPTICAL-PROPERTIES; DEPOLARIZATION; METASURFACES; ENHANCEMENT; PARTICLES; NANODISKS; CRYSTALS; FIELDS; MODES;
D O I：
10.1364/OE.24.003562
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Subwavelength metallic particles support plasmon resonances that allow extreme confinement of light down to the nanoscale. Irradiation with left-and right hand circularly polarized light results in the excitation of circular plasmon modes with opposite helicity. The Lorenz force lifts the degeneracy of the two modes in magnetic nanoparticles. Consequently, the confinement and frequency of localized surface plasmon resonances can be tuned by an external magnetic field. In this paper, we experimentally demonstrate this effect for nickel nanoparticles using magnetic circular dichroism (MCD). Besides, we show that non-local surface lattice resonances in periodic arrays of the same nanoparticles significantly enhance the MCD signal. A numerical model based on the modified long wavelength approximation is used to reproduce the main features in the experimental spectra and provide design rules for large MCD effects in sensing applications. (C) 2016 Optical Society of America
引用
收藏
页码：3562 / 3571
页数：10
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