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(a) Broadband transmission through EOT grating for incidence angles of 0°, 2°, and 4° with predicted spectral position of resonant coupling to SPPs noted for each angle. (b) ECQCL emission for selected wavelengths across the laser’s tunable range.
Schematic of the experimental setup for study of spatially and spectrally resolved transmission of ECQCL emission through an EOT grating as a function of incidence angle.
Contour plot of transmitted/scattered light intensity as a function of position and wavelength for (a) horizontally and (b) vertically polarized normally incident radiation. Contour plots for horizontally polarized laser incident at (c) 2° and (d) 4°. For all plots, the spatial scan for each laser wavelength is normalized from zero to one, to better image propagation. Broadband EOT transmission spectra for incidence angles of 0°, 2°, and 4° are overlaid on plot (a), (c), and (d), respectively.
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