5 September 2014 Near and far field experiments of power transfer by mode beating in plasmonic devices
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Heat assisted magnetic recording (HAMR) requires a sufficiently small heat spot, which is much below the diffraction limit of the wavelength of the used light. This can be achieved with an optical near field source consisting of a small metallic wedge which supports edge plasmons. The power transfer between a dielectric rectangular waveguide and this metallic wedge is investigated in simulations and experiments. Beating of two eigenmodes of this system leads to power oscillations between the waveguide core and the edge plasmon along their overlap length. This was confirmed in near field experiments which are based on the evaporation of phase change material with the absorbed optical near fields as heat source. Devices with weak and strong edge plasmon excitation could be clearly distinguished in a simple far field experiment.
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Tobias Maletzky, Tobias Maletzky, Dayu Zhou, Dayu Zhou, Eric X. Jin, Eric X. Jin, Moris Dovek, Moris Dovek, "Near and far field experiments of power transfer by mode beating in plasmonic devices", Proc. SPIE 9201, Optical Data Storage 2014, 92010J (5 September 2014); doi: 10.1117/12.2064516; https://doi.org/10.1117/12.2064516

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