ABSTRACT

To a large extent, the ¢eld of PhCs can be thought of as having it origins in the rather conventional one-dimensional (1D) thin ¢lm stack, wherein a quarter wave thickness of alternating materials is arranged in a periodic fashion. In this device, it is well known that certain frequencies are transmitted while others are not. As the index contrast between the alternating layers is increased, the selectivity of the transmitted and re¦ected wavelengths is also increased.