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Diffstat (limited to 'fresnel_reflection.m')
| -rw-r--r-- | fresnel_reflection.m | 28 |
1 files changed, 0 insertions, 28 deletions
diff --git a/fresnel_reflection.m b/fresnel_reflection.m deleted file mode 100644 index 347d60b..0000000 --- a/fresnel_reflection.m +++ /dev/null @@ -1,28 +0,0 @@ -function [R, theta_t] = fresnel_reflection(n1, n2, theta_i) -%% calculates intensity reflection coefficient for s and p polarizations -%% for light travelling from material with index of refraction n1 to material with n2 -%% theta_i - incident angle in medium 1 with respect to normal, could be a vector -%% R - coefficients of reflection array [Rs, Rp] -%% theta_t - transmitted/refracted angle in medium 2 with respect to normal - - if ( size(theta_i)(1) != 1) - error('theta_i must be a vector or scalar'); - end - - %% see http://en.wikipedia.org/wiki/Fresnel_equations - %% refraction angle or angle of transmitted beam with respect to normal - sin_theta_t=n1/n2*sin(theta_i); - %% special cases: total internal reflection - indx = (abs(sin_theta_t) >= 1); - sin_theta_t( indx ) = sign( sin_theta_t(indx) ); - - - theta_t = asin(sin_theta_t); % angle of refraction or transmitted beam - - cos_theta_t = cos( theta_t ); - cos_theta_i = cos( theta_i ); - - Rs = ( ( n1*cos_theta_i - n2*cos_theta_t ) ./ ( n1*cos_theta_i + n2*cos_theta_t ) ).^2; - Rp = ( ( n1*cos_theta_t - n2*cos_theta_i ) ./ ( n1*cos_theta_t + n2*cos_theta_i ) ).^2; - R = [Rs; Rp]; -end |