a 25 in total a1 025 Plot the dispersion relation of an electromagnetic field propagating through the air eg Field 1 in Figure 2 a2 025 In the same graph plot the dispersion relation of an electromagnetic field propagating through the glass eg Field 2 in Figure 2 a3 025 Plot now the dispersion relation of the surface plasmon polariton traveling in the airmetal interface a4 05 Indicating what happens for the SPP wavelength compare with its wavelength in vacuum at very small and at the resonance frequency sp Note that you can explain it based on the expression of the dispersion relation of the bound mode at that interface for very small frequencies and for frequencies close to the resonance