Abstract

The multilayer consists of a basic period of I dielectric layers of quarterwave optical thickness that is repeated p times: Suppose the basic period Is surrounded by an incident medium and emergent medium of the same (but arbitrary) refractive Index. If its reflectance is zero, the stopband is suppressed. Kard^1,2 developed approximations for the R/Tpolynomial of the basic period. The procedure is to set R/T to zero at specific frequencies and to solve linear equations for the refractive Indices. Within certain limitations imposed by the symmetry of the R/T curve and dispersion of the optical materials, any number of contiguous and noncontiguous stopbands may be suppressed.

© 1985 Optical Society of America