Abstract

Layers of antimonous sulfide and chiocite are alternately coated on the glass substrate. Their relative refractive index is n_b/n_a = 2.1 in the wavelength range of 0.6–1.2 μm. The thicknesses a_m of all chiocite layers are the same, i.e., a_m = 〈a〉 = d/4n_a whereas those of Sb₂S₃ have a random distribution around the average value 〈b〉 = d/4n_b, where d = 650 nm. The degree of disorder D is given by D = db/(〈a〉 + 〈b〉), where db is the average fluctuation of the thicknesses of the Sb₂S₃ layers and is expressed by (db)² = [∑_m(b_m − 〈b〉)²]/m, where 〈a〉 + 〈b〉 is the average period length of multilayer. To observe the dependence of light transmissivity on the multilayer's length, we fabricated three kinds of multilayer. They all had the same D = 0.16, but their lengths varied as L = 10, 15, and 21 (in units of (a) + (b)), respectively.

© 1994 Optical Society of America