We report on our preliminary results in the realization and characterization of a porous silicon (PSi) resonant mirror (RM) for optical biosensing. We have numerically and experimentally studied the coupling between the electromagnetic field, totally reflected at the base of a high refractive index prism, and the optical modes of a PSi waveguide. This configuration is very sensitive to changes in the refractive index and/or in thickness of the sensor surface. Due to the high specific area of the PSi waveguide, very low DNA concentrations can be detected confirming that the RM could be a very sensitive and labelfree optical biosensor.
Porous Silicon Based Resonant Mirrors for Biochemical Sensing / DE TOMMASI, E; DE STEFANO, L; Re, A I; DI SARNO, V; Rotiroti, L; Arcari, Paolo; Lamberti, Annalisa; Sanges, Carmen; Rendina, I.. - In: SENSORS. - ISSN 1424-8220. - ELETTRONICO. - 8:(2008), pp. 6549-6556.
Porous Silicon Based Resonant Mirrors for Biochemical Sensing
ARCARI, PAOLO;LAMBERTI, ANNALISA;SANGES, CARMEN;
2008
Abstract
We report on our preliminary results in the realization and characterization of a porous silicon (PSi) resonant mirror (RM) for optical biosensing. We have numerically and experimentally studied the coupling between the electromagnetic field, totally reflected at the base of a high refractive index prism, and the optical modes of a PSi waveguide. This configuration is very sensitive to changes in the refractive index and/or in thickness of the sensor surface. Due to the high specific area of the PSi waveguide, very low DNA concentrations can be detected confirming that the RM could be a very sensitive and labelfree optical biosensor.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
