  A better understanding of the optical properties of a device structure
characterized by a random arrangement of materials with different dielectric
properties at a length scale comparable to the wavelength of light is crucial
for the realization of new optical and optoelectronic devices. Here we have
studied the light transmission of disordered photonic structures made with two
and three different materials, characterized by the same optical thickness. In
their transmission spectra a formation of peaks, with a transmission of up to
75%, is evident. The spectral position of such peaks is very regular, which is
a result of the constraint that all layers have the same optical thickness.
This gives rise to a manifold of applications such as new types of bandpass
filters and resonators for distributed feedback lasers.
