# Physics 123 "Majors" Section Unit 1

Announcements 2/3/12 Prayer Reading Quiz P&Ws treatment of multilayers used:

a. summing infinite reflections b. boundary conditions from Maxwells equations Reading Quiz The symbol used for the matrix for the inner layers, that was multiplied over

and over, was: a. H b. I c. L d. M e. Q Three layer problem, revisited

Using matrices! Extension to N layers (or N+2, depending on how you want to count)

Example 1 normal incidence air, n=1 n=2 n=1.5 n=2 n=1.5

1 m 1 m 1 m What is R? (as a function of ) Example 2 normal incidence air,

n=1 n=2 n=1.5 n=2 n=1.5 1 m 1 m 1 m 10

What is R? (as a function of ) Dielectric Mirrors/Filters Dielectric Mirrors/Filters Notch Filter Long Pass Filter

Short Pass Filter Reading Quiz To get high reflectivity in a multilayer stack, each layer should have thickness:

a. b. c. d. e. (# layers)layers)) Fig. 4.16

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