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.

作者：Edoardo, De Tommasi；Luca, De Stefano；Ilaria, Rea；Valentina, Di Sarno；Lucia, Rotiroti；Paolo, Arcari；Annalisa, Lamberti；Carmen, Sanges；Ivo, Rendina

来源：Sensors (Basel, Switzerland) 2008 年 8卷 10期