tanh(w/2 sqrt(β^2 −k^2εd) =−εd /εm sqrt((β^2−k^2εm)/(β^2−k^2εd))

where w is betweem 50 to 250.

β=phi/d

d=500nanometer

k^2=9.85*10^(-5)

εd=1

εm=-17.2355+0.498i(complex number)

Please help me out.

• function
• matlab
• plot
• using

w=50:0.0001:250;
f= sin(w);
plot(w,f);

now define f as you want too.

check this out as well

http://www.mathworks.com/help/techdoc/ref/plot.html