Based on the quarter-wave dielectric mirror (Bragg reflector), a chirp scheme to enhance the bandwidth is proposed. We model the chirped mirror by successively cascading a number of sub-Bragg reflectors in which the optical lengths of the two constituent dielectric layers in each sub-Bragg reflector are varied in a linear chirp manner. With the change in the chirp parameter, it is seen that the reflection bandwidth is pronouncedly enlarged due to the shift in the bandedges. In addition, a broader bandwidth can be obtained when a different chirp arrangement of structure is designed. Investigation of angle-dependent reflectance for the TE wave is also given.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Electrical and Electronic Engineering