title: A porous silicon-based optical interferometric biosensor.
abstract: A biosensor has been developed based on induced wavelength shifts in the Fabry-Perot fringes in the visible-light reflection spectrum of appropriately derivatized thin films of porous silicon semiconductors. Binding of molecules induced changes in the refractive index of the porous silicon. The validity and sensitivity of the system are demonstrated for small organic molecules (biotin and digoxigenin), 16-nucleotide DNA oligomers, and proteins (streptavidin and antibodies) at pico- and femtomolar analyte concentrations. The sensor is also highly effective for detecting single and multilayered molecular assemblies.
authors.affiliation: Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.
authors.forename: V S
authors.initials: VS
authors.lastname: Lin
authors.forename: K
authors.initials: K
authors.lastname: Motesharei
authors.forename: K P
authors.initials: KP
authors.lastname: Dancil
authors.forename: M J
authors.initials: MJ
authors.lastname: Sailor
authors.forename: M R
authors.initials: MR
authors.lastname: Ghadiri
mesh_terms: D000818:Animals; D015374:Biosensing Techniques; D019921:Biotinylation; D018076:DNA, Complementary / Q000032:analysis; D004076:Digoxigenin; D007368:Interferometry; D051379:Mice; D012680:Sensitivity and Specificity; D012825:Silicon; D019809:Streptavidin
chemical_list: D018076:DNA, Complementary; D019809:Streptavidin; D004076:Digoxigenin; D012825:Silicon