Question

4

Problem #4: Assume normal incidence. a) Calculate the reflectivity of the following quarter-wave stacks: i. Air, L, substrate ii. Air, H, L, substrate iii. Air, L, H, L, H, L, substrate Assume normal incidence in air (no = 1), L = 1.4, H = 1.8, Nsub = 1.5 (b) Which configuration results in the best anti-reflection coating? I If these multi-layer film stacks are designed for use with 520 nm light, calculate the minimum required layer thicknesses (physical dimension) for the H and L layers (ie: let m=1). I need all parts please

Answer 1

Answer The reflectivity quater Love G Given that Aisi L substrate noat, Lilice, 18 m. sa 15 Reflectivity k = 1 no low.ton, to, gan ) ( no longer ang in jou No of Tepended pair of the 2n 12 = (-0,2) 22=0.04

(b) The queation Air Hit Substrate noir, n = 1:4, n = 18,9=15 B rno (nuan ng (ne)? 1 ² l no l movie of nolojia 1:57 14118)?-1.561.49? ( 1/188² +15 (143 ) 2.35 x 103 -0.00235 3 Air , Li H, L, H, L substrate .n,=like, nu = l.8, in 15 N=2

- :hando (194) 3 3567 P =(1-3,567) 143.567 , 0.315 6 the configuration coating gives coaling as it oresults in the anti-reflection best ante reflecting has boas reflectivity (c) the stacks are designed with 52am Required layer thiners Hand į layer

Minimum required layer mutnantnalle 1=520nm 520 4 - 130