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(a) Schematic of a sample structure in which a light beam excites SPPs via a coupling grating, propagates along the Au surface as SPPs, and is scattered toward free space via a decoupling grating, and the spectrum of the scattered light is determined using a delayed self-heterodyne method. (b) SEM image of the coupling and decoupling gratings, having periods of 1500 nm and 1550 nm, respectively.
Calculated results for the electric field intensity of the prepared sample in both (a) TM (magnetic field parallel to the long axis of the slit) polarization and (b) TE (electric field parallel to the long axis of the slit) polarization.
(a) Experimental setup to monitor the polarization dependence of the scattered light intensity. (b) Scattered light intensity as function of polarization angle of the incident light beam. Error bars indicate the standard deviation of 50 repeated samples taken at a given location.
(a) Experimental setup for delayed self-heterodyne method. (b) The beat spectra for each of the distances between the coupling and decoupling gratings (d = 100, 200, and 300 μm). (c) The FWHMs and peak values of the beat spectra as a function of distance between the coupling and decoupling gratings. Error bars indicate the standard deviation of 10 repeated samples taken at a given location.
The calculated spectrum of the SPP mode propagating for each distance d of 100, 200, and 300 μm, based on a Drude model.
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