Ultraviolet Beam Focusing in Gallium Arsenide by Direct Excitation of Surface Plasmon Polaritons

Figure 7

Optimal light intensity enhancement spectrum for GaAs, for comparison with the spectrum of GaAs. The left vertical axis is the quality factor. The right vertical axis is the light intensity at 0° collection angle at the center of the exit air-film interface with the optimized groove pitch at each incident wavelength. The green “Intensity-actual” curve is the light intensity simulated with the optimal groove pitch picked up through traversal, while the red “Intensity-calc” curve is the light intensity simulated with the optimal groove pitch calculated by (4).