Transmittance correlation of porous silicon multilayers used as chemical sensor platforms.

E. OSORIO; RAÚL URTEAGA; H. JUAREZ; R.R. KOROPECKI

Santa Fe

Congreso; Congreso Internacional de Metalurgia y Materiales 14° SAM-CONAMET XIII; 2014

This work presents a system of two identical optical microcavities made of mesoporous silicon that was analyzed as a platform for chemical sensing or biosensing. When a porous microcavity is exposed to an analyte, the effective refractive index of its layers change, and its optical transmittance is shifted towards lower wavenumbers.  We constructed a device employing two identical porous silicon. One of them remains unexposed and the other is allowed to be in contact with the analyte. The transmitted intensity of the system results the integrated product of the transmittances of both multilayers, and it can be approximated to the autocorrelation function of the transmittance of the microcavity. Its value depends on the analyte concentration so that it can be used for sensing purposes.