Coupling defects in macroporous silicon photonic crystals

Abstract

In this study we compare the optical response of macroporous silicon photonic crystals with several cavities inside their structure respect to the obtained in the single cavity case. We show that there are as much raising peaks in the transmission spectrum as number of cavities are inserted in the middle of the structure. Even more, this study reports the enhancement in the peaks' features -e.g. base closer to the zero transmission line and better quality factor- as the number of defects increases. This enhanced characteristics can be used to realize spectroscopic gas sensing, since the resulting peaks are narrow enough to be placed inside the absorption spectra of a target gas.