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Sensors 2008, 8(10), 6549-6556; doi:10.3390/s8106549
Article

Porous Silicon Based Resonant Mirrors for Biochemical Sensing

1,* , 1, 1,2, 1,2, 1,3, 4, 4, 4 and 1
1 Institute for Microelectronics and Microsystems – Unit of Naples – National Council of Research, Via P. Castellino 111, 80131 Napoli, Italy 2 Department of Physical Sciences, University of Naples “Federico II”, Via Cinthia, 80126 Naples, Italy 3 Department of Organic Chemistry and Biochemistry, University of Naples “Federico II”, Via Cinthia, 80128 Napoli, Italy 4 Department of Biochemistry and Medical Biotechnologies, University of Naples “Federico II”, Via S. Pansini 5, 80131 Napoli, Italy
* Author to whom correspondence should be addressed.
Received: 6 June 2008 / Revised: 6 October 2008 / Accepted: 21 October 2008 / Published: 23 October 2008
(This article belongs to the Section Biosensors)
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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.
Keywords: DNA Optical Biosensors; Porous Silicon; Resonant Mirrors DNA Optical Biosensors; Porous Silicon; Resonant Mirrors
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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De Tommasi, E.; De Stefano, L.; Rea, I.; Di Sarno, V.; Rotiroti, L.; Arcari, P.; Lamberti, A.; Sanges, C.; Rendina, I. Porous Silicon Based Resonant Mirrors for Biochemical Sensing. Sensors 2008, 8, 6549-6556.

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