In this work, we report how tube lattice hollow-core fibers can be successfully used to build sensors for molecule detection. The inner silica surface of the fiber is functionalized and coated with a probe layer, which permits to bond only with a particular molecule (the target). When the fiber is infiltrated with a solution containing the target an additional layer is crated on the silica surface causing a redshift of the fiber transmission spectrum. The technique does not require any additional transducer component such as Bragg gratings, amplifying techniques such as nano-particles nor coherent sources. It simply consists of the measurement of the transmission spectrum of a piece of fiber some tens centimeters long. The principle is validated with experimental results showing the detection of streptavidin protein. A solution containing streptavidin was flowed trough the hollow core of the fiber coated with biotine. The measurement of the transmitted spectrum before and after the infiltration showed the presence of a some nanometer thick bio-layer.
Hollow Core Inhibited Coupling Fibers for Biological Optical Sensing / Giovanardi, Fabio; Cucinotta, Annamaria; Rozzi, Andrea; Corradini, Roberto; Benabid, Fetah; Rosa, Lorenzo; Vincetti, Luca. - In: JOURNAL OF LIGHTWAVE TECHNOLOGY. - ISSN 0733-8724. - (2019), pp. 1-1. [10.1109/JLT.2019.2892077]