
#1
Mar1412, 06:09 AM

P: 1

Hi guys!
Was wondering if anyone was confident with Fresnel equations for a refractive index interface. From what I understand: Assume incoming normal plane wave travelling in zdirection and polarised in x plane. Assume z=0 is the plane that separates two materials: n_1 and n_2 (refractive index) I think the Fresnel solution for the wave should go: Ex = (for z>0) exp(i*k0*n_1*z)+r*exp(i*k0*n_1*z) (for z<0) t*exp(i*k0*n_2*z) the RED term representing the normal incident component and the GREEN term represents the reflected component which only exist in the n_1 half and the BLUE term representing the transmitted component which only exists in the n_2 half. I am uncertain about if I should be adding both the incident and reflected term (for z>0) as long as they are travelling in different directions or if I need to subtract them. i.e. should it be RED+GREEN or REDGREEN? As I already have defined them to travel in opposite directions. Any thoughts? Many thanks! 



#2
Mar1412, 07:03 AM

Sci Advisor
Thanks
P: 2,153

You find the coefficients by solving for the boundary conditions at the surface between the two media. This can be found in any textbook on electrodynamics or optics.



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