Abstract We investigate the transverse magneto-optic Kerr effect (TMOKE) of magnetoplasmonic crystals grown on top of commercial optical disks. From full angle-resolved scans we can identify Wood’s anomalies related to the excitation of plasmons of different orders. From these maps we also detect a wide range of wavelengths and angles of incidence for which the TMOKE signal is increased due to the interaction of light with surface propagating plasmons. Remarkably, conditions are established for unexpectedly large responses at quasi-normal incidence, where, by fundamental symmetry reasons, the intrinsic TMOKE should be vanishingly small. The key towards this unexpected outcome is to engineer the geometry of magnetoplasmonic crystals, so that first-order plasmon dispersion lines run up towards quasi-normal angles of incidence. These results provide general rules for magneto-optic enhancement and, in particular, show the potential of standard commercial disks as platforms for enhanced magneto-optic devices.

中文翻译：

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磁等离子体晶体准垂直入射时意外的大横向磁光克尔效应

摘要 我们研究了在商用光盘上生长的磁等离子体晶体的横向磁光克尔效应 (TMOKE)。从全角分辨扫描中，我们可以识别与不同阶等离子体激元激发相关的伍德异常。从这些图中，我们还检测到广泛的波长和入射角，由于光与表面传播等离子激元的相互作用，TMOKE 信号增加了这些波长和入射角。值得注意的是，条件是为准正态入射的意外大响应建立的，其中，由于基本对称性原因，内在 TMOKE 应该非常小。实现这一意外结果的关键是设计磁等离子体晶体的几何形状，使一阶等离子体色散线朝着准垂直入射角延伸。