Applied Physics

Holey Different Films

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Science  09 Jan 2009:
Vol. 323, Issue 5911, pp. 187
DOI: 10.1126/science.323.5911.187d

Surface plasmon-polaritons (SPPs) are generally studied in noble metals. The problem in observing coupling of SPPs to the magnetic field effects in ferromagnetic metals is that absorption broadens out the anticipated magneto-optical signatures. Ctistis et al. prepared cobalt films (50 to 100 nm thick) that contained a hexagonal array of nanoholes (diameters between 220 and 330 nm and with a spacing of 470 nm). The presence of the holes changed the magnetic properties of the film in two ways—it increased the coercive field in the in-plane directions and created magnetization components out-of-plane. Light transmission through these films depended on the external magnetic field through the excitation of SPPs. The films showed higher polarization rotation than a continuous cobalt film, and the enhancement occurred at the wavelength maxima of the SPPs. — PDS

Nano Lett. 10.1021/nl801811t (2008).

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