Abstract
A method to sense the excitation of surface plasmon polariton (SPP) on metallic grating device using the transmitted signal will be presented. The grating transmittance signal will be fully characterized varying the light incident angle and azimuthal grating orientation by means of the SPP vector model and rigorous coupled-wave analysis simulation. Simulation results will be compared with experimental measurements obtained with a 635 nm wavelength laser in the transverse magnetic polarization mode. The laser will light grating devices in contact with either air or water through a customized microfluidic chamber. A characterization of the diffracted rays will show the relationship between the grating coupling configuration and the Kretschmann one. In fact, the diffracted ray affected by SPP resonance is transmitted with an output angle which is the same incident angle that should be used to excite SPP in Kretschmann configuration. Lastly, the grating parameters (amplitude and metal thickness) impact on transmittance signal will be analyzed with respect to the order zero reflectance signal.
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Perino, M., Pasqualotto, E., Scaramuzza, M. et al. Characterization of Grating Coupled Surface Plasmon Polaritons Using Diffracted Rays Transmittance. Plasmonics 9, 1103–1111 (2014). https://doi.org/10.1007/s11468-014-9720-5
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DOI: https://doi.org/10.1007/s11468-014-9720-5