Fluorescence enhancement by a photonic crystal with a nanorod- structured high index layer

摘要

We report the design and characterization of a one-dimensional photonic crystal slab incorporating a nanorod-structured TiO_2 high index layer. The photonic crystal is designed to function as an optical resonator at the wavelength of a laser used to excite fluorescence emission and the highly porous TiO_2 film, not only increases the surface area of the device but more importantly allows fluorophores to penetrate into the most intense region of the resonance-enhanced near electric fields. The design shows an enhancement of 193-fold in fluorescence intensity for the detection of cyanine 5-labeled streptavidin in comparison to an unpatterned glass slide.