科研之友
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摘要
Layer chirping can be used to extend the photonic band-gap of dielectrics mirrors to cover a wide spectral bandwidth. However, for structures composed of dielectrics with non-negligible absorption and scattering, linear chirping introduces Gires-Tournois resonances that can enhance optical losses within the stop-band. We show that the use double-chirping, a concept originally developed for dispersion compensation in ultra-fast optics, can be used to substantially reduce unwanted losses and improve the spectral reflectance over the entire stop-band. We demonstrate the concept experimentally by fabricating broad-band mirrors in the visible range using porous silicon.
- 出版日期2018-7-1
