Multichannel detector system for surface plasmon resonance biosensors
Photonic systems are gaining an important role in the field of medical diagnosis due to the achievable high sensitivity and selectivity and low cost, enabling the fabrication of disposable point of care diagnosis systems for multiple pathologies. In this work we present the detector subsystem developed for a multi-channel surface plasmon resonance (SPR) based sensor. The core of the system is a multimode interferometer splitter, fabricated in amorphous silicon, followed by multiple sensitive SPR structures that modulate the transmitted light waves which are then detected by infrared detectors. For this purpose a highly adaptable detection system based on a InGaAs line CCD device was developed. The first results of the application of this multichannel SPR sensor for simultaneous detection of multiple analytes are presented.
Instituto Superior de Engenharia de Lisboa (Portugal), CTS -UNINOVA (Portugal)