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Reflection and Interference from Thin Films

PHY 2049: Chapter 3614 Reflection and Interference from Thin Films Normal-incidence light strikes surface covered by a thin film Some rays reflect from film surface Some rays reflect from substrate surface (distance d further) Path length difference = 2d causes Interference From full constructive to full destructive, depending on dn1n2n0= 1(Angle shown, but actuallynormally incident)PHY 2049: Chapter 3615 Standard analysis of Thin Film Interference ()11122 Max ( constructive )2 Min (destructive)nndmdm ==+dn1n2(Angle shown, but actuallynormally incident)n0= 111nn =Wavelength inside film!

PHY 2049: Chapter 36 14 Reflection and Interference from Thin Films ÎNormal-incidence light strikes surface covered by a thin film Some rays reflect from film surface Some rays reflect from substrate surface (distance d further) ÎPath length difference = 2d causes interference From full constructive to full destructive, depending on λ d n 1 n 2 n 0 = 1

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